subject:(dewatering)

University of Manchester

1. Zhang, Yi. Suspension Dewatering with Aggregate Densification.

Degree: 2014, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270

► This thesis concerns design of two pieces of suspension dewatering equipment (i.e. transient batch settlers and steady state continuous gravity thickeners). In a transient batch… (more)

▼ This thesis concerns design of two pieces of suspension dewatering equipment (i.e. transient batch settlers and steady state continuous gravity thickeners). In a transient batch settler, very slow densification of aggregates within the suspension is considered whilst the drag on the solids in the suspension is assumed to be negligible. The interface of the suspension is then determined by a balance between gravity and the gradient of the compressive yield stress of the gelled suspension. The compressive yield stress functional form in general could be either a weakly gelled formula, or a strongly gelled formula. These formulae differ in the way they behave for solids concentrations in the neighbourhood of the suspension gel point. The effects of the above two gel formulae, the evolution of the compressive yield stress functional form over time during aggregate densification, different initial suspension heights, and different initial feed solids volume fractions upon the predictions of consolidated bed structures and solids volume fractions obtained at the bottom of a batch settler, and upon the evolution of the heights of the suspension and the consolidated bed have been explored. A sufficiently tall initial suspension height might lead to insignificant increases in the solids volume fractions obtained at the bottom of batch settlers after time-dependent aggregate densification. The interfaces of the suspension and the consolidation zone coincide after aggregate densification if the gel point, which increases with time, is larger than the initial feed solids volume fractions. Moreover, the maximum permitted underflow solids fluxes predicted from steady state thickeners have been investigated and compared. Pre-shearing of aggregates which densifies aggregates to have smaller diameters upon entering the thickener is necessary if large underflow solids fluxes and small underflow solids volume fractions are specified. The solids volume fraction at the top of the consolidated bed which is the densified gel point is influenced by the extent of pre-shearing of aggregates. An algorithm for determining this densified gel point has also been developed. In reality, thickeners contain not just a consolidating bed, but also a hindered settling region above it. When the hindered settling region is considered in a thickener, the effects of the extent of aggregate densification that has occurred in the hindered settling region and how that impacts upon thickener performance and sludge rheological properties have been explored in this thesis. A new algorithm for predicting the densified gel point obtained at the top of the consolidated bed has been developed when the hindered settling region is present. The effects of underflow solids volume fractions, aggregate densification rate parameters and pre-shearing of aggregates upon the predictions of maximum permitted underflow solids fluxes, sludge rheological properties, and thickener performance have been explored. The predictions of thickener performance using both the weakly and… Advisors/Committee Members: MARTIN, ALASTAIR AD, Grassia, Paul, Martin, Alastair.

Subjects/Keywords: Suspension;

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APA (6^th Edition):

Zhang, Y. (2014). Suspension Dewatering with Aggregate Densification. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270

Chicago Manual of Style (16^th Edition):

Zhang, Yi. “Suspension Dewatering with Aggregate Densification.” 2014. Doctoral Dissertation, University of Manchester. Accessed January 26, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270.

MLA Handbook (7^th Edition):

Zhang, Yi. “Suspension Dewatering with Aggregate Densification.” 2014. Web. 26 Jan 2021.

Vancouver:

Zhang Y. Suspension Dewatering with Aggregate Densification. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Jan 26]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270.

Council of Science Editors:

Zhang Y. Suspension Dewatering with Aggregate Densification. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:232270

University of Alberta

2. Haroon, M Hasin. Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers.

Degree: MS, Department of Chemical and Materials Engineering, 2014, University of Alberta

URL: https://era.library.ualberta.ca/files/kw52jb71z

► The development of a method to consolidate and dewater Athabasca oil sands mature fine tailings (MFT) is one of the major challenges facing Alberta’s oil… (more)

Subjects/Keywords: Dewatering; Mature Fine Tailings; Flocculation

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APA (6^th Edition):

Haroon, M. H. (2014). Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/kw52jb71z

Chicago Manual of Style (16^th Edition):

Haroon, M Hasin. “Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers.” 2014. Masters Thesis, University of Alberta. Accessed January 26, 2021. https://era.library.ualberta.ca/files/kw52jb71z.

MLA Handbook (7^th Edition):

Haroon, M Hasin. “Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers.” 2014. Web. 26 Jan 2021.

Vancouver:

Haroon MH. Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers. [Internet] [Masters thesis]. University of Alberta; 2014. [cited 2021 Jan 26]. Available from: https://era.library.ualberta.ca/files/kw52jb71z.

Council of Science Editors:

Haroon MH. Flocculation and dewatering of kaolinite suspensions and oil sands mature fine tailings using dual polymers. [Masters Thesis]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/kw52jb71z

McMaster University

3. Westhaver, Kurt. Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries.

Degree: MASc, 2018, McMaster University

URL: http://hdl.handle.net/11375/23753

►

The treatment of municipal, industrial and agricultural wastewater produces a semi-liquid mixture known as sludge. The costs associated with pumping, transporting, treating, storing, and disposing… (more)

▼

The treatment of municipal, industrial and agricultural wastewater produces a semi-liquid mixture known as sludge. The costs associated with pumping, transporting, treating, storing, and disposing of sludge are significant. Therefore, sludge dewatering techniques are employed to increase the solids content of the material by separating the solid and liquid components, thus reducing the overall volume requiring further handling. Non-mechanical dewatering methods require large areas of land and favorable climatic conditions, while mechanical dewatering technologies require significant capital investment and ongoing operation and maintenance by highly trained personnel. Due to these shortcomings, the conventional methods of sludge dewatering are not applicable to scenarios where: the quantity of sludge is small, there is limited budget, there are land restrictions, or dewatering is performed seasonally. An alternative approach that has recently attracted considerable attention is the use of dewatering fabrics; specially engineered textiles supplied in the form of very large bags into which the sludge is pumped. The concept itself is simple, pressure inside the bag pushes the free water through the fabric while the solid material is retained within. Unfortunately, these products have exhibited poor dewatering performance for certain feed materials. In this work, a series of ‘next-generation’ engineered dewatering fabrics featuring elongated ‘slit’ pores were produced using laser cutting techniques. A comprehensive analysis of the effect of the filter properties on dewatering performance was performed using sludge sourced from two different operations: municipal wastewater treatment and precious metal mining.

Thesis

Master of Applied Science (MASc)

In recent years, the use of engineered dewatering fabrics has emerged as a viable alternative to conventional methods of sludge dewatering in numerous application areas including municipal wastewater, mining, and pulp and paper. Previous studies have focused on the development of empirical ratios between dewatering performance and the porous properties of the textile material. The limitation of this approach is that the latter is difficult to characterize using currently available techniques due to the complex, nonuniform pore structure of conventional woven and nonwoven dewatering fabrics. In this study, a series of dewatering fabrics were produced using advanced microfabrication techniques featuring well-defined slit-pore geometries. Full-factorial design-of-experiment frameworks were employed to evaluate the effects of slit-pore dimensions and slit-pore spacing on cake layer development and key dewatering performance metrics. Laboratory scale dewatering performance tests were performed using both anaerobic digested sludge from the Woodward Avenue Wastewater Treatment Plant in Hamilton, Ontario and metal precipitate sludge from a nickel-copper mine in Ontario, Canada. The results from this study provide new insights into the importance of the cake layer in geotextile…

Advisors/Committee Members: Latulippe, David, Chemical Engineering.

Subjects/Keywords: Geotextile; Dewatering; Sludge; Wastewater

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APA (6^th Edition):

Westhaver, K. (2018). Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/23753

Chicago Manual of Style (16^th Edition):

Westhaver, Kurt. “Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries.” 2018. Masters Thesis, McMaster University. Accessed January 26, 2021. http://hdl.handle.net/11375/23753.

MLA Handbook (7^th Edition):

Westhaver, Kurt. “Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries.” 2018. Web. 26 Jan 2021.

Vancouver:

Westhaver K. Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries. [Internet] [Masters thesis]. McMaster University; 2018. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/11375/23753.

Council of Science Editors:

Westhaver K. Development of Dewatering Textile Materials Incorporating Slit-Pore Geometries. [Masters Thesis]. McMaster University; 2018. Available from: http://hdl.handle.net/11375/23753

4. Das, Dipesh. Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering.

Degree: MS, Civil Engineering, 2013, University of North Dakota

URL: https://commons.und.edu/theses/1412

► The Grand Forks Waste Water Treatment Plant (GFWWTP) is currently sending its waste activated sludge (WAS) from the activated sludge treatment process to an… (more)

Subjects/Keywords: Biosolids; Dewatering; GFWWTP; Lagoon; Polymer

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APA (6^th Edition):

Das, D. (2013). Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering. (Masters Thesis). University of North Dakota. Retrieved from https://commons.und.edu/theses/1412

Chicago Manual of Style (16^th Edition):

Das, Dipesh. “Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering.” 2013. Masters Thesis, University of North Dakota. Accessed January 26, 2021. https://commons.und.edu/theses/1412.

MLA Handbook (7^th Edition):

Das, Dipesh. “Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering.” 2013. Web. 26 Jan 2021.

Vancouver:

Das D. Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering. [Internet] [Masters thesis]. University of North Dakota; 2013. [cited 2021 Jan 26]. Available from: https://commons.und.edu/theses/1412.

Council of Science Editors:

Das D. Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering. [Masters Thesis]. University of North Dakota; 2013. Available from: https://commons.und.edu/theses/1412

Linköping University

5. Eriksson, Linnea. Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective.

Degree: Environmental Technology and Management, 2016, Linköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129763

► Production of biogas is one of several alternatives to meet sustainable energy solutions and waste management. However, managing the by-product (digestate) can be problematic… (more)

▼ Production of biogas is one of several alternatives to meet sustainable energy solutions and waste management. However, managing the by-product (digestate) can be problematic with its high handling costs. Digestate from wet co-digestion biogas plants contains large volumes of water, causing high transportation costs and low concentration of the valuable nutrients. An alternative to try and reduce the associated costs is by processing the digestate. Processing the digestate for volume reduction allow for more economic and resource efficient ways of handling the product. This master thesis was performed on an initiative from Tekniska verken AB and address digestate handling from Linköping biogas plant, a large co-digestion biogas plant in Sweden. The project aimed to find a feasible, more resource efficient management of their digestate by looking at digestate processing alternatives.The approach systematically evaluated a large number of processing techniques by both literature and communication with TvAB or experts. A selection of techniques were further evaluated were studies in laboratory and a market analysis on digestate provided complementary information, aiding the economical evaluation. Results suggest that processing by centrifuge is a viable, economic option when digestate management is costly and a liquid fraction can be recirculated in the process. It has the potential to significantly reducing digestate management costs. Other processing alternatives may be beneficial if transportation distance can be greatly reduced and/or synergies can be found, but the findings in this project suggest that only treatment with centrifuge is of interest. The results are subject to a number of conditions (such as size of the plant) and assumptions (such as recirculation of a liquid fraction) and therefore need individual adaption to be applicable at any specific plant. Conclusive remarks are that although site specific conditions affect the choice of processing, a project such as this may help reducing the necessary time spent on evaluation. Both research process and results may provide valuable findings for similar evaluations in any industry.

Subjects/Keywords: Digestate; bio-fertilizer; dewatering; biogas

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APA (6^th Edition):

Eriksson, L. (2016). Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective. (Thesis). Linköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129763

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Eriksson, Linnea. “Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective.” 2016. Thesis, Linköping University. Accessed January 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129763.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Eriksson, Linnea. “Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective.” 2016. Web. 26 Jan 2021.

Vancouver:

Eriksson L. Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective. [Internet] [Thesis]. Linköping University; 2016. [cited 2021 Jan 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129763.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Eriksson L. Evaluating digestate processing methods at Linköping biogas plant : A resource efficient perspective. [Thesis]. Linköping University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129763

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

6. Ho, Man Yin. Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode.

Degree: 1999, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-5869 ; https://doi.org/10.14711/thesis-b651885 ; http://repository.ust.hk/ir/bitstream/1783.1-5869/1/th_redirect.html

► The mechanism of electro-osmotic dewatering (EOD) is quite different from that of mechanical dewatering. Compared with the mechanical dewatering, EOD can be remarkably effective for… (more)

▼ The mechanism of electro-osmotic dewatering (EOD) is quite different from that of mechanical dewatering. Compared with the mechanical dewatering, EOD can be remarkably effective for hardly dewaterable suspensions of very fine particles and gelatinous materials. However, the gradual discontinuity of liquid state in the dewatering material, due to the formation of an unsaturated layer at the anode, causes the electrical blockage rendering EOD no longer effective. Mixing is believed to reduce such an effect. Therefore, a research is conducted to investigate this effect by having the anode rotating. An experimental apparatus was specially designed for this study. It consisted of one acrylic plastic cylinder, one porous stainless steel plate and one circular stainless steel plate. The porous plate acted as the cathode, and the circular plate as the rotating anode. Bentonite sludge, with 9.lwt% initial solid content was used as the model sludge. The rotational speed varied from 0 to 300rpm. Three commercial impellers (axial flow impeller, high-shear dispersing impeller and high-shear radial flow impellers) were also used as rotating anodes and tested for their performances on EOD. The experimental results showed that, by using a flat plate as the rotating anode, the water removed from the sludge increased significantly with the rotational speed initially and reached a plateau at 240rpm. This was believed due to the "fall-off" of the cake from the anode during the rotation. The solid content of the cake could be 23.0wt%, 60% better than the performance of normal EOD. Besides, the excessive suspension added on the top of the anode was found to have a beneficial effect for both water removal and suppression of drier cake formation. It was also found that a constant thickness of the cake formed (about 5mm) was more efficient in electro-osmotic dewatering. The combined effects of anode rotation and dry cake thickness control could remove 56% of the initial moisture within the suspension. It was 37% better than normal EOD. Different commercial impellers performed similarly at the rotational speed of 240rpm. In addition, the value of rpm=60 was found to be the most effective condition for dewatering in the case of using high shear dispersing impeller. At this optimal condition, the water removal enhancement was comparable with those obtained using the rotating plate with the dry cake thickness control. The interesting experimental results were well explained following the fundamental analysis of EOD.

Subjects/Keywords: Electroosmotic dewatering

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APA (6^th Edition):

Ho, M. Y. (1999). Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-5869 ; https://doi.org/10.14711/thesis-b651885 ; http://repository.ust.hk/ir/bitstream/1783.1-5869/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ho, Man Yin. “Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode.” 1999. Thesis, Hong Kong University of Science and Technology. Accessed January 26, 2021. http://repository.ust.hk/ir/Record/1783.1-5869 ; https://doi.org/10.14711/thesis-b651885 ; http://repository.ust.hk/ir/bitstream/1783.1-5869/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ho, Man Yin. “Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode.” 1999. Web. 26 Jan 2021.

Vancouver:

Ho MY. Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode. [Internet] [Thesis]. Hong Kong University of Science and Technology; 1999. [cited 2021 Jan 26]. Available from: http://repository.ust.hk/ir/Record/1783.1-5869 ; https://doi.org/10.14711/thesis-b651885 ; http://repository.ust.hk/ir/bitstream/1783.1-5869/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ho MY. Enhanced electro-osmotic dewatering of fine particle suspension using a rotating electrode. [Thesis]. Hong Kong University of Science and Technology; 1999. Available from: http://repository.ust.hk/ir/Record/1783.1-5869 ; https://doi.org/10.14711/thesis-b651885 ; http://repository.ust.hk/ir/bitstream/1783.1-5869/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

KTH

7. NEIRA, HUGO ALEJANDRO PULGAR. Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt.

Degree: Chemical Science and Engineering (CHE), 2015, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445

► For this thesis project, a method to analyze the dewatering time for the drainage process during laboratory sheet making on a Finnish sheet former… (more)

Subjects/Keywords: Tissue papper; dewatering time; dewatering speed; Laboratory sheet and sheet formation.

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APA (6^th Edition):

NEIRA, H. A. P. (2015). Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

NEIRA, HUGO ALEJANDRO PULGAR. “Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt.” 2015. Thesis, KTH. Accessed January 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

NEIRA, HUGO ALEJANDRO PULGAR. “Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt.” 2015. Web. 26 Jan 2021.

Vancouver:

NEIRA HAP. Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt. [Internet] [Thesis]. KTH; 2015. [cited 2021 Jan 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

NEIRA HAP. Inverkan av avvattningshastighet på formation och styrka på ark med låg ytvikt. [Thesis]. KTH; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172445

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

8. Zhu,Ying. Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering.

Degree: MS, Department of Chemical and Materials Engineering, 2015, University of Alberta

URL: https://era.library.ualberta.ca/files/cns0646039

► The accumulation of oil sands tailings poses serious environmental issues in Alberta, Canada. In the tailings ponds, the fine clays and residual bitumen form the… (more)

▼ The accumulation of oil sands tailings poses serious environmental issues in Alberta, Canada. In the tailings ponds, the fine clays and residual bitumen form the so-called mature fine tailings (MFT) which contain 30~40 wt% fine solid particles primarily below 44 µm in size, 1~3 wt% residual bitumen with the balance water. Without any physical or chemical treatment, the MFT remains as a stable suspension in tailings ponds indefinitely. Adding a polymer as a process aid to treat the oil sands tailings has been investigated for many years to cause fine solids to flocculate and thus accelerate dewatering. However, the performance of single polymer treatment is generally unsatisfactory. Recent studies in sewage treatment suggest that a dual polymer method, in which two different polymers are added in sequence, has a better flocculation performance. In this study, the use of dual polymer pairs in the flocculation and dewatering of MFT was investigated. A cationic polydiallyldimethylammonium chloride (polyDADMAC) polymer (Alcomer 7115, from BASF) and an anionic linear polyacrylamide polymer (A3335, from SNF) were found to be an effective combination in MFT dewatering treatment by filtration. The effects of polymer dosage, filtration pressure and the sequence of polymer addition were studied. Capillary suction time (CST) and specific resistance to filtration (SRF) were measured to evaluate the dewaterability of treated MFT. From the experimental data, MFT treated with the polymer combination of Alcomer 7115 and A3335 can give low CST results around 50 s, compared with around 3000 s of untreated MFT. Also the SRF was decreased from a magnitude of 1014 m/kg to 1012 ~ 1013 m/kg, indicating treated MFT being relatively much easier to dewater. Cryogenic scanning electron microscopic (Cryo-SEM) images of the treated MFT were taken to show the morphology of the MFT with or without treatment with either a single polymer or dual polymer pairs. The results demonstrated that the pore sizes are larger when the dual polymer pairs were used, implying higher dewaterability of MFT in this case.

Subjects/Keywords: dewatering; dual polymer treatment; mature fine tailings

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APA (6^th Edition):

Zhu,Ying. (2015). Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cns0646039

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

Zhu,Ying. “Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering.” 2015. Masters Thesis, University of Alberta. Accessed January 26, 2021. https://era.library.ualberta.ca/files/cns0646039.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

Zhu,Ying. “Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering.” 2015. Web. 26 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

Zhu,Ying. Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Jan 26]. Available from: https://era.library.ualberta.ca/files/cns0646039.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

Zhu,Ying. Cationic and Anionic Dual Polymer Pairs for Mature Fine Tailings Flocculation and Dewatering. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/cns0646039

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

9. Pinto, Thiago César de Souza. Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico.

Degree: Mestrado, Engenharia Mineral, 2007, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/ ;

►

O espessamento é uma operação unitária que tem como finalidade separar, por diferença de massa específica entre o sólido e o líquido, sólidos suspensos em… (more)

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O espessamento é uma operação unitária que tem como finalidade separar, por diferença de massa específica entre o sólido e o líquido, sólidos suspensos em meio fluido, pela ação da gravidade. É bastante empregado industrialmente em processos contínuos no adensamento de polpas e minérios, em unidades com reação de precipitação e no tratamento de efluentes, dentre outros. Os equipamentos que realizam esta operação, chamados espessadores, são, em geral, tanques abertos de formato cilíndrico, instalados no eixo vertical com a entrada da suspensão na parte superior central, de fundo ligeiramente cônico para a retirada da polpa espessada e calha circulando o topo para descarga do líquido clarificado. As várias técnicas de projeto destas unidades contínuas são comumente baseadas em ensaios de bancada com provetas. Não é raro ocorrerem para os mesmos dados experimentais, áreas de projeto com desvios superiores a 50%. O presente trabalho visou verificar a validade das técnicas de seleção de TALMADGE-FITCH, ROBERTS e FLUXO DE SÓLIDOS, para o dimensionamento de espessadores industriais com salmoura e lodo biológico. Foram realizados para este fim, ensaios de espessamento em provetas com as próprias suspensões industriais, calculadas as áreas pelas técnicas supracitadas e comparadas com os resultados das secções dos equipamentos contínuos industriais. Os desvios médios dos diâmetros para cada técnica em relação ao espessadores industriais apresentaram contra a segurança dos equipamentos um valor de 42% para o método de Talmadge-Fitch, 45,5% para Roberts e 43,5% para o método do Fluxo de sólidos. Concluiu-se, para as condições estudadas, que os métodos de provetas utilizados forneceram valores na mesma ordem de grandeza e que requerem um fator de escala para o dimensionamento das unidades industriais contínuas.

Thickening is a unit operation that has the goal of solid-liquid separation. The principle of this separation is the difference of specific weight between solid and liquid. This unit operation is used in mineral industries, to ore concentrate, wastewater, and others. The tanks called thickeners are usually open, with the feed on the top of the equipment. The solids discharge is done trough the bottom in a conical shape. The most techniques of sizing thickeners are based on graduated cylinders, and it is a common get result that has a difference area in about 50%. This happens because security coefficient, difficulties for results interpretation and scales factors. This research has the goal to apply the techniques of selection of Solids Flux, Roberts and Talmadge-Fitch in graduated cylinders. These methods are classical for thickener sizing. A comparison has been made between the results by those methods with the data obtained from continuous industrial units for salt solution and biological brine. The shunting line for the techniques obtained was 42% for Talmadge-Fitch, 45,5% for Roberts and 43,5% for Solid Flux in the relationship with industrial thickeners. In conclusion, for the studied condition, all methods showed…

Advisors/Committee Members: Lima, José Renato Baptista de.

Subjects/Keywords: Desaguamento; Dewatering; Mineral processing; Processamento mineral; Thickening

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pinto, T. C. d. S. (2007). Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/ ;

Chicago Manual of Style (16^th Edition):

Pinto, Thiago César de Souza. “Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico.” 2007. Masters Thesis, University of São Paulo. Accessed January 26, 2021. http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/ ;.

MLA Handbook (7^th Edition):

Pinto, Thiago César de Souza. “Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico.” 2007. Web. 26 Jan 2021.

Vancouver:

Pinto TCdS. Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico. [Internet] [Masters thesis]. University of São Paulo; 2007. [cited 2021 Jan 26]. Available from: http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/ ;.

Council of Science Editors:

Pinto TCdS. Aplicação de técnicas clássicas para polpas não floculadas de dimensionamento de espessadores aplicadas a suspensões de salmoura e lodo biológico. [Masters Thesis]. University of São Paulo; 2007. Available from: http://www.teses.usp.br/teses/disponiveis/3/3134/tde-01042009-101018/ ;

University of Alberta

10. Zhang, Chenxi. Cross flow filtration of oil sands total tailings.

Degree: MS, Department of Civil and Environmental Engineering, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/x346d5748

► This research is a follow up to preliminary studies reported by Beier and Sego (2008) and the objective is to investigate laboratory scale dewatering of… (more)

Subjects/Keywords: cross flow filtration, dewatering, oil sands tailings

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, C. (2010). Cross flow filtration of oil sands total tailings. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/x346d5748

Chicago Manual of Style (16^th Edition):

Zhang, Chenxi. “Cross flow filtration of oil sands total tailings.” 2010. Masters Thesis, University of Alberta. Accessed January 26, 2021. https://era.library.ualberta.ca/files/x346d5748.

MLA Handbook (7^th Edition):

Zhang, Chenxi. “Cross flow filtration of oil sands total tailings.” 2010. Web. 26 Jan 2021.

Vancouver:

Zhang C. Cross flow filtration of oil sands total tailings. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Jan 26]. Available from: https://era.library.ualberta.ca/files/x346d5748.

Council of Science Editors:

Zhang C. Cross flow filtration of oil sands total tailings. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/x346d5748

Stellenbosch University

11. Olivier, Warren John Lloyd. Investigating the Hi-G Dryer System on coarse daberas slurry material.

Degree: MScEng, Process Engineering, 2015, Stellenbosch University

URL: http://hdl.handle.net/10019.1/96637

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ENGLISH ABSTRACT: Namdeb Diamond Corporation is constantly investigating and investing in technologies to continuously improve performance and productivity. Diamond mining operations have been taking place… (more)

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ENGLISH ABSTRACT: Namdeb Diamond Corporation is constantly investigating and investing in technologies to continuously improve performance and productivity. Diamond mining operations have been taking place for more than a hundred years – ever since the first diamond was discovered in 1908. Diamonds are a scarce and finite resource. As current resources are being depleted, the Namdeb exploration team are exploring areas not previously considered feasible. One such resource is the Sendelingsdrift resource, situated about 20 km from Daberas, one of the current Namdeb operations along the Orange River. When an environmental assessment was conducted, it was discovered that the Sendelingsdrift area was environmentally sensitive in terms of constructing a slimes dam, creating difficulties for slurry processing. Thus the Derrick Hi-G Dryer Fines Recovery System was considered as a probable solution; unfortunately it was found that the slurry discharge would be too coarse for this technology. The Hi-G Dryer technology has never been tested with a coarse slurry feed. The Daberas processing plant produces slurry of -3 mm particles, which is very coarse compared to the 75 μm particles with which the Hi-G Dryer system normally operates. Testing was conducted at Daberas by directing the Daberas wet-sizing underflow as feed to the Hi-G Dryer system. The majority of the testing was done under production conditions, which proved to be very difficult. The results of the initial supplier-designed Hi-G Dryer processing system produced an oversize moisture content of 17%, which was better than that which the supplier had claimed but not as good as that which the existing Daberas degrit system produced. After studying the system parameters and optimising certain parameters, a proposed Hi-G Dryer system was recommended for coarser slurries. The new process parameters generated improved results, with an oversize moisture content of 13% – better than the Daberas dewatering system benchmark. The Hi-G screen oversize material also proved to be conveyable and was quantified with oversize yield stress test results. Overall system efficiency was improved after the recommended modifications to the design had been made and a simulation had been conducted to understand the impact of certain parameters on the overall system.

AFRIKAANSE OPSOMMING: Die Namdeb Diamantmaatskappy is voortdurend daarop ingestel om die maatskappy se prestasie en produktiwiteit te verbeter, veral deur in nuwe tegnologie te belê. Daar word sedert die eerste diamant in 1908 gevind is, diamante langs die Oranjerivier ontgin. Diamante is egter 'n skaars en beperkte hulpbron. Namate die hulpbron uitgeput word, word die Namdeb-span genoodsaak om gebiede te ondersoek wat voorheen nie as ekonomies ontginbaar beskou is nie. Die Sendelingsdriftgebied, wat sowat 20 km van Daberas, een van Namdeb se huidige ontginningsgebiede langs die Oranjerivier, geleë is, is so 'n gebied. Tydens die omgewingsevaluering is egter gevind dat die Sendelingsdriftgebied…

Advisors/Committee Members: Els, Ellis Raymond, Stellenbosch University. Faculty of Engineering. Dept. of Process Engineering..

Subjects/Keywords: Dewatering; Hydrocyclones; Screening; Slimes (Mining); UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Olivier, W. J. L. (2015). Investigating the Hi-G Dryer System on coarse daberas slurry material. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/96637

Chicago Manual of Style (16^th Edition):

Olivier, Warren John Lloyd. “Investigating the Hi-G Dryer System on coarse daberas slurry material.” 2015. Masters Thesis, Stellenbosch University. Accessed January 26, 2021. http://hdl.handle.net/10019.1/96637.

MLA Handbook (7^th Edition):

Olivier, Warren John Lloyd. “Investigating the Hi-G Dryer System on coarse daberas slurry material.” 2015. Web. 26 Jan 2021.

Vancouver:

Olivier WJL. Investigating the Hi-G Dryer System on coarse daberas slurry material. [Internet] [Masters thesis]. Stellenbosch University; 2015. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10019.1/96637.

Council of Science Editors:

Olivier WJL. Investigating the Hi-G Dryer System on coarse daberas slurry material. [Masters Thesis]. Stellenbosch University; 2015. Available from: http://hdl.handle.net/10019.1/96637

McMaster University

12. Cobbledick, Jeffrey. OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES.

Degree: MASc, 2016, McMaster University

URL: http://hdl.handle.net/11375/19012

►

There is growing interest in the use of high performance anaerobic digestion (AD) processes for the production of biogas at wastewater treatment facilities to offset… (more)

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There is growing interest in the use of high performance anaerobic digestion (AD) processes for the production of biogas at wastewater treatment facilities to offset the energy demands associated with wastewater treatment. Recuperative thickening (RT) is a promising technique which involves recycling a portion of the digested solids back to the incoming feed. In general there exists a significant number of knowledge gaps in the field of RT because the studies that have been conducted to date have almost exclusively occurred in pilot or full scale trials; this approach greatly limits the amount of process optimization that can be done in a given trial. In this work, a detailed and comprehensive study of RT processes was conducted at the lab scale; a demonstration of the optimization of polymer assisted dewatering is given and biogas production and quality monitored. Two custom designed digesters (capacity = 1.5 L) were operated in parallel with one acting as a ‘control’ digester and the other operating under a semi-batch RT mode; both digesters were also operated in parallel under RT with alternative polymer flocculants. There were no significant changes in the overall biogas methane composition; however the RT digester had an average biogas productivity over two times higher than the control one. It was found that the recycling of the polymer flocculant back into the RT digester resulted in a significant improvement in dewatering performance. At the highest polymer concentration tested, all polymer flocculants demonstrated equivalent dewatering performance achieving over 6 times lower CST’s than the control; at lower polymer concentrations the 4516 polymer flocculant had superior dewatering performance. Thus, there exists an opportunity to decrease the overall consumption of polymer flocculants through judicious selection of the flocculant and the dose that is used both for the thickening and end-stage dewatering processes in RT digesters.

Thesis

Master of Applied Science (MASc)

In wastewater treatment (WWT), solid wastes are treated using a technique called anaerobic digestion (AD) which involves the conversion of solids in biogas by anaerobic bacteria. Biogas is a mixture of mostly methane and carbon dioxide and can be used as a fuel source for energy production. There’s growing interest in the use of high performance AD processes for the production of biogas at WWT facilities to offset the energy demands associated with WWT. Recuperative thickening (RT) is a promising technique which involves recycling a portion of the digested solids back to the digester. In this work, a detailed and comprehensive study of RT processes was conducted at the lab scale; a demonstration of the optimization of polymer assisted dewatering is given and biogas production and quality monitored. Two 1.5 L custom designed digesters were operated in parallel one as a ‘control’ and the other operating under a semi-batch RT.

Advisors/Committee Members: Latulippe, David, Chemical Engineering.

Subjects/Keywords: Anaerobic Digestion; Dewatering; Polymer Optimization; Biogas Production

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cobbledick, J. (2016). OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/19012

Chicago Manual of Style (16^th Edition):

Cobbledick, Jeffrey. “OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES.” 2016. Masters Thesis, McMaster University. Accessed January 26, 2021. http://hdl.handle.net/11375/19012.

MLA Handbook (7^th Edition):

Cobbledick, Jeffrey. “OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES.” 2016. Web. 26 Jan 2021.

Vancouver:

Cobbledick J. OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/11375/19012.

Council of Science Editors:

Cobbledick J. OPTIMIZING POLYMER ASSISTED DEWATERING IN RECUPERATIVE THICKENING VIA A LAB-SCALE SYSTEM FOR ENHANCED BIOGAS PRODUCTION IN ANAEROBIC DIGESTION PROCESSES. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/19012

Colorado State University

13. Hincapié Gómez, Esteban. Development of a continuous flow ultrasonic harvesting system for microalgae.

Degree: PhD, Mechanical Engineering, 2014, Colorado State University

URL: http://hdl.handle.net/10217/88437

► Microalgae have vast potential as a sustainable source of biofuel. However, numerous technoeconomic analyses have indicated that microalgae harvesting represents a critical bottleneck in the… (more)

▼ Microalgae have vast potential as a sustainable source of biofuel. However, numerous technoeconomic analyses have indicated that microalgae harvesting represents a critical bottleneck in the microalgae value chain in terms of energy requirements, capital cost and operating cost. This dissertation presents an approach that uses a combination of acoustophoretic, fluid mechanical, and gravitational forces toward the development of a continuous flow microalgae harvesting system. Ultrasonic Standing Waves have been widely reported in the literature as an approach to manipulate particles in a fluid, a phenomena known as acoustophoresis. These waves exert an acoustic force that agglomerate the cells in the wave nodes or antinodes and the force is directly proportional to the cell acoustic contrast factor. Ultrasonic microalgae harvesting is a promising low cost and low energy approach. However, a better understanding of the acoustic properties of microalgae is essential for the development of this technology. Accordingly, a major component of this work focused on accurately quantifying the acoustic contrast factor of microalgae cells of Nannochloropsis oculata, Nannochloropsis gaditana, Phaeodactylum tricornutum and Chlamydomonas reinhardtii by measuring the average cell density and speed of sound using a vibrating tube densitometer. The results indicate a linear correlation of density and speed of sound as a function of cell concentration. Using this correlation, non-scattering volume average relationships were used to compute density and speed of sound for the average algal cell. The acoustic contrast factor was estimated to be between 0.04 - 0.06 for microalgae cells in their corresponding growth media. Second, particle tracking velocimetry was used to determine the magnitude of the acoustophoretic force. In these studies, in addition to microalgae cells, polyamide seeding particles were used as a surrogate. The results obtained conclude that the maximum acoustophoretic forces are approximately 5 pN for Chlamydomonas reinhardtii cells and the results also show that there is change in the acoustic contrast factor from positive to negative with lipid accumulation. This dissertation also presents a novel device for the acoustic harvesting of microalgae. The design is based on using the acoustophoretic force, acoustic transparent materials and inclined settling (Boycott effect). A filtration efficiency of 70% ± 5% and a concentration factor of 11.6 ± 2.2 were achieved at a flow rate of 25 mL • min-1 and an energy consumption of 3.6 ± 0.9 kWh • m-3. The effects of the applied power, flow rate, inlet cell concentration and inclination were explored. It was found that the filtration efficiency of the device is proportional to the power applied. However, the filtration efficiency experienced a plateau at a 100 W • L-1 of power density applied. The filtration efficiency also increased with increasing inlet cell concentration and was inversely proportional to the throughput of the device as measured flow rate. It was also… Advisors/Committee Members: Marchese, Anthony J. (advisor), Willson, Bryan D. (committee member), Dasi, Lakshmi Prasad (committee member), Peers, Graham (committee member).

Subjects/Keywords: harvesting; dewatering; microalgae; acoustic contrast factor; acoustophoresis

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APA (6^th Edition):

Hincapié Gómez, E. (2014). Development of a continuous flow ultrasonic harvesting system for microalgae. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/88437

Chicago Manual of Style (16^th Edition):

Hincapié Gómez, Esteban. “Development of a continuous flow ultrasonic harvesting system for microalgae.” 2014. Doctoral Dissertation, Colorado State University. Accessed January 26, 2021. http://hdl.handle.net/10217/88437.

MLA Handbook (7^th Edition):

Hincapié Gómez, Esteban. “Development of a continuous flow ultrasonic harvesting system for microalgae.” 2014. Web. 26 Jan 2021.

Vancouver:

Hincapié Gómez E. Development of a continuous flow ultrasonic harvesting system for microalgae. [Internet] [Doctoral dissertation]. Colorado State University; 2014. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10217/88437.

Council of Science Editors:

Hincapié Gómez E. Development of a continuous flow ultrasonic harvesting system for microalgae. [Doctoral Dissertation]. Colorado State University; 2014. Available from: http://hdl.handle.net/10217/88437

Luleå University of Technology

14. Nyberg, Per. Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit.

Degree: 2011, Luleå University of Technology

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-45869

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On December 20th, 2010, Northland Resources AB was approved to begin mining iron in the ore body Tapuli, located in Kaunisvaara, north of Pajala.… (more)

Subjects/Keywords: Technology; Teknik; Dike; Dewatering; Mine Development; Tapuli

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APA (6^th Edition):

Nyberg, P. (2011). Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-45869

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nyberg, Per. “Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit.” 2011. Thesis, Luleå University of Technology. Accessed January 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-45869.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nyberg, Per. “Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit.” 2011. Web. 26 Jan 2021.

Vancouver:

Nyberg P. Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit. [Internet] [Thesis]. Luleå University of Technology; 2011. [cited 2021 Jan 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-45869.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nyberg P. Tapuli Mine Pre-Development : Dike Construction and Dewatering of the Starter Pit. [Thesis]. Luleå University of Technology; 2011. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-45869

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

15. Gupta, Nikhil. Development of a Novel Fine Coal Cleaning and Dewatering Technology.

Degree: PhD, Mining Engineering, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/64262

► The cleaning and dewatering of ultrafine (minus 44 micron) coal slurries is one of the biggest challenges faced by coal industry. Existing commercial technologies cannot… (more)

Subjects/Keywords: fine coal; dewatering; processing; scale-up

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gupta, N. (2014). Development of a Novel Fine Coal Cleaning and Dewatering Technology. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64262

Chicago Manual of Style (16^th Edition):

Gupta, Nikhil. “Development of a Novel Fine Coal Cleaning and Dewatering Technology.” 2014. Doctoral Dissertation, Virginia Tech. Accessed January 26, 2021. http://hdl.handle.net/10919/64262.

MLA Handbook (7^th Edition):

Gupta, Nikhil. “Development of a Novel Fine Coal Cleaning and Dewatering Technology.” 2014. Web. 26 Jan 2021.

Vancouver:

Gupta N. Development of a Novel Fine Coal Cleaning and Dewatering Technology. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10919/64262.

Council of Science Editors:

Gupta N. Development of a Novel Fine Coal Cleaning and Dewatering Technology. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/64262

University of Texas – Austin

16. -3934-5298. Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant.

Degree: MSin Engineering, Environmental and Water Resources Engineering, 2017, University of Texas – Austin

URL: http://hdl.handle.net/2152/63563

► The City of Austin (CoA) employs anaeraboic digestion at Hornsby Bend Biosolids Management Plant (HBBMP) to treat the sludge generated from upstream wastewater treatment. HBBMP… (more)

Subjects/Keywords: Sludge; Dewatering; Polymer; Belt filter press

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APA (6^th Edition):

-3934-5298. (2017). Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63563

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-3934-5298. “Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant.” 2017. Masters Thesis, University of Texas – Austin. Accessed January 26, 2021. http://hdl.handle.net/2152/63563.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-3934-5298. “Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant.” 2017. Web. 26 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-3934-5298. Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/2152/63563.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-3934-5298. Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/63563

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Toronto

17. Ya, Jaehoon. Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners.

Degree: 2017, University of Toronto

URL: http://hdl.handle.net/1807/79498

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Biosludge has been a problem for pulp and paper mills due to its difficulty to dewater. Electro-dewatering can significantly reduce the water content of biosludge,… (more)

Subjects/Keywords: Biosludge; Conditioners; Electro-dewatering; Electro-osmosis; Pulp and paper mill; Sludge Dewatering; 0542

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APA (6^th Edition):

Ya, J. (2017). Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/79498

Chicago Manual of Style (16^th Edition):

Ya, Jaehoon. “Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners.” 2017. Masters Thesis, University of Toronto. Accessed January 26, 2021. http://hdl.handle.net/1807/79498.

MLA Handbook (7^th Edition):

Ya, Jaehoon. “Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners.” 2017. Web. 26 Jan 2021.

Vancouver:

Ya J. Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners. [Internet] [Masters thesis]. University of Toronto; 2017. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/1807/79498.

Council of Science Editors:

Ya J. Electro-dewatering Treatment of Pulp and Paper Mill Biosludge: The Effects of Conditioners. [Masters Thesis]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/79498

Karlstad University

18. Lingman, Oskar. Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion.

Degree: Science and Technology (starting 2013), 2018, Karlstad University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68785

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Med rådande klimathot i form av ökande koldioxidhalter i vår jords atmosfär krävs stora gemensamma insatser för att minska utsläppen. Genom att välja bort… (more)

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Med rådande klimathot i form av ökande koldioxidhalter i vår jords atmosfär krävs stora gemensamma insatser för att minska utsläppen. Genom att välja bort fossila bränslen och istället använda miljövänliga energikällor skapar vi tillsammans en hållbar framtid. Träpellets är ett biobränsle tillverkat på biomassa i form av träflis och dess förbränning kan i princip ses som koldioxidneutral. Tillverkningen av bränslepellets är emellertid en energikrävande process där termisk torkning av råvaran står för en majoritet av energianvändningen under pelletstillverkningen, där träflisen torkas från 55–10% fukthalt genom kondensering. I och med den ökande efterfrågan av pellets kommer även större möjligheter till effektivisering, där torksteget i produktionen har stort fokus. Syftet med denna studie har varit att undersöka energi- och miljöeffekter av en ny tvåstegsteknik bestående av mekanisk avvattning som försteg till termisk torkning av träflis i en pelletsproduktion. Den mekanisk avvattningsteknik som undersökts är Drinor CDP - Continuous Dewatering Press. Det primära målet med arbetet har varit att undersöka Drinors CDP som försteg till en bandtork och pneumatisk tork för att slutligen svara på vilken av kombinationerna som ger lägst energianvändning och miljöpåverkan i form av utsläpp. Som referens kommer torkprocessen hos Stora Enso Timber Gruvön användas, där en bandtork i dag används som torksteg. Som delmål kommer två olika partikelstorlekar undersökas vid pneumatisk torkning bestående av spån och flis, detta för att utreda partikelstorlekars påverkan på pneumatisk torkning och om det ens är möjligt att pneumatiskt transportera större flis. Resultaten visar att mekanisk avvattning är en bra lösning för pelletsindustrin. Fallet med CDP i kombination med bandtork ledde till en energireducering med ca 50% och 35% minskade utsläpp som en följd, jämfört med referensfallet bestående av endast bandtork. Resultaten visade även att stora träflispartiklar kunde transporteras pneumatiskt vid en lufthastighet på drygt 23 m/s. Pneumatisk torkning bidrog till en hög användning av el på grund av höga temperaturer, vilket i sin tur leder till stora mängder koldioxidutsläpp.

With the occurring climate threats in the form of increasing levels of carbon dioxide in our Earth's atmosphere, major joint efforts are needed to reduce our emissions. By opting out of fossil fuels and instead using environmentally friendly energy sources, we help create a sustainable future. Wood pellets are a biofuel made from biomass in the form of woodchips and its combustion can in principle be seen as neutral. However, the production of wood pellets is an energy-consuming process where thermal drying of the wet wood chips accounts for a majority of the total energy use during pellet production, where wood chips are typically dried from 55 – 10% moisture by condensation. With an increasing demand for pellets, there will also be more opportunities for efficiency, where the drying stage in production has a large focus. The purpose of this study…

Subjects/Keywords: Pellets; mechanical dewatering; dewatering; energy; wood chips; environment; Pellets; mekanisk avvattning; avvattning; energi; träflis; miljö; Energy Engineering; Energiteknik

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lingman, O. (2018). Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion. (Thesis). Karlstad University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68785

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lingman, Oskar. “Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion.” 2018. Thesis, Karlstad University. Accessed January 26, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68785.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lingman, Oskar. “Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion.” 2018. Web. 26 Jan 2021.

Vancouver:

Lingman O. Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion. [Internet] [Thesis]. Karlstad University; 2018. [cited 2021 Jan 26]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68785.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lingman O. Energi- och miljöeffekter av mekanisk avvattning som försteg till torkning av träflis vid pelletsproduktion. [Thesis]. Karlstad University; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-68785

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Technical University of Lisbon

19. Castro, Teresa Amélia Garcia de. Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva.

Degree: 2011, Technical University of Lisbon

URL: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/4029

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Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia

Sludge management has become a key issue in urban wastewater treatment. Constructed wetland with common… (more)

Subjects/Keywords: constructed wetlands; sewage sludge; Phragmites australis; sludge mineralization; sludge dewatering

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APA (6^th Edition):

Castro, T. A. G. d. (2011). Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva. (Thesis). Technical University of Lisbon. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/4029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Castro, Teresa Amélia Garcia de. “Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva.” 2011. Thesis, Technical University of Lisbon. Accessed January 26, 2021. http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/4029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Castro, Teresa Amélia Garcia de. “Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva.” 2011. Web. 26 Jan 2021.

Vancouver:

Castro TAGd. Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva. [Internet] [Thesis]. Technical University of Lisbon; 2011. [cited 2021 Jan 26]. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/4029.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Castro TAGd. Proposta de valorização agronómica das lamas da fito-etar de Barroca D'Alva. [Thesis]. Technical University of Lisbon; 2011. Available from: http://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/4029

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cape Peninsula University of Technology

20. Kholisa, Buyisile. The effect of rheological properties on sludge dewatering in belt filter press .

Degree: 2016, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2464

► Polymers used as flocculants in the secondary sludge dewatering process are one of the most expensive inputs in these plants. The disadvantage is that these… (more)

Subjects/Keywords: Rheology; Sewage – Purification – Activated sludge process; Sewage sludge – Dewatering; Filter-presses

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APA (6^th Edition):

Kholisa, B. (2016). The effect of rheological properties on sludge dewatering in belt filter press . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2464

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kholisa, Buyisile. “The effect of rheological properties on sludge dewatering in belt filter press .” 2016. Thesis, Cape Peninsula University of Technology. Accessed January 26, 2021. http://etd.cput.ac.za/handle/20.500.11838/2464.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kholisa, Buyisile. “The effect of rheological properties on sludge dewatering in belt filter press .” 2016. Web. 26 Jan 2021.

Vancouver:

Kholisa B. The effect of rheological properties on sludge dewatering in belt filter press . [Internet] [Thesis]. Cape Peninsula University of Technology; 2016. [cited 2021 Jan 26]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2464.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kholisa B. The effect of rheological properties on sludge dewatering in belt filter press . [Thesis]. Cape Peninsula University of Technology; 2016. Available from: http://etd.cput.ac.za/handle/20.500.11838/2464

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Wang, Xinshu. Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation.

Degree: 2006, Helsinki University of Technology

URL: http://lib.tkk.fi/Diss/2006/isbn9512282313/

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The objective of this thesis was to improve press dewatering and paper properties of kraft pulps by controlling hornification and internal fibrillation. Hornification was induced… (more)

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The objective of this thesis was to improve press dewatering and paper properties of kraft pulps by controlling hornification and internal fibrillation. Hornification was induced by drying and by pressing pulps, and internal fibrillation was developed in refining. Hornification and internal fibrillation are related to the change in fibre pore structure. In this thesis, a thermoporosimetry technique with cyclohexane as an absorbate was tested and found suitable for detecting the change in pore size and pore volume during drying and refining. The results show that for never-dried fibres, refining mainly expands the large pores in the cell wall, whereas it has only a slight effect on the small pores. Drying closes most of the large pores and a substantial amount of the small pores. For dried fibres, refining not only expands the large pores but also reopens the small pores to a certain extent. Even though the pore volume of previously dried pulps can be recovered by refining (i.e., the pulp can be reswollen), some small pores, which are closed in drying, are not reopened by normal levels of refining. In other words, refining does not completely reverse hornification. Drying of pulps greatly reduces pulp swelling, enhancing dewatering but impairing tensile strength. Dried pulps offer a far better combination of dewatering and tensile strength than never-dried pulps. One possible reason is that some small hard-to-dewater pores in the fibre wall are irreversibly closed by drying, which enables better dewatering. However, pulp drying is energy-consuming. Pressing pulps may provide an economical way to improve dewatering, while maintaining paper strength properties. Pressing hornifies pulps, which promotes dewatering but impairs tensile strength to a certain extent. On the other hand, pressing causes fibres to flatten, with the flattened fibres providing more surface contact for bonding, thus increasing density and tensile strength. Never-dried pulps which were pressed before refining were found to give both improved dewatering and better tensile strength. The refining results support the earlier view that internal fibrillation is largely produced by a cyclic compressive action. It is suggested that fibres need to be turned over in refining and compressed from different directions in order to disrupt their internal structure and cause internal fibrillation. Compression also facilitates fibre straightening, but does not promote external fibrillation and fines generation. At the same swelling level, more straightened pulps give higher tensile strength, and pulps with less fines and external fibrillation enable better dewatering. Hence, to achieve an optimum combination of dewatering and tensile strength, chemical pulp refining should aim at increasing internal fibrillation, straightening fibres, and keeping the amount of fines and external fibrils at a low level.

Reports / Helsinki University of Technology, Laboratory of Paper and Printing Technology. Series A, ISSN 1796-7414; 26

Advisors/Committee Members: Helsinki University of Technology, Department of Forest Products Technology, Laboratory of Paper and Printing Technology.

Subjects/Keywords: swelling; thermoporosimetry; refining; pressing; drying; dewatering; tensile strength

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APA (6^th Edition):

Wang, X. (2006). Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation. (Thesis). Helsinki University of Technology. Retrieved from http://lib.tkk.fi/Diss/2006/isbn9512282313/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Xinshu. “Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation.” 2006. Thesis, Helsinki University of Technology. Accessed January 26, 2021. http://lib.tkk.fi/Diss/2006/isbn9512282313/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Xinshu. “Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation.” 2006. Web. 26 Jan 2021.

Vancouver:

Wang X. Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation. [Internet] [Thesis]. Helsinki University of Technology; 2006. [cited 2021 Jan 26]. Available from: http://lib.tkk.fi/Diss/2006/isbn9512282313/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang X. Improving the Papermaking Properties of Kraft Pulp by Controlling Hornification and Internal Fibrillation. [Thesis]. Helsinki University of Technology; 2006. Available from: http://lib.tkk.fi/Diss/2006/isbn9512282313/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

22. Zhang, Ying. Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT).

Degree: MS, Department of Civil and Environmental Engineering, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/z603qz86s

► Tailing ponds in Northern Alberta has covered an area of 170 km2. Directive 074 issued in 2009 set stringent criteria for tailings reclamation. Freeze-thaw dewatering… (more)

Subjects/Keywords: tailings; MFT; dewatering; freezing; freeze-thaw; finite strain consolidation

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APA (6^th Edition):

Zhang, Y. (2012). Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT). (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/z603qz86s

Chicago Manual of Style (16^th Edition):

Zhang, Ying. “Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT).” 2012. Masters Thesis, University of Alberta. Accessed January 26, 2021. https://era.library.ualberta.ca/files/z603qz86s.

MLA Handbook (7^th Edition):

Zhang, Ying. “Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT).” 2012. Web. 26 Jan 2021.

Vancouver:

Zhang Y. Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT). [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Jan 26]. Available from: https://era.library.ualberta.ca/files/z603qz86s.

Council of Science Editors:

Zhang Y. Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT). [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/z603qz86s

Penn State University

23. Basu, Anwesha. Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/18853

► Mature Fine tailings (MFTs) are the byproducts from the mineral processing operations of bitumen mining. They are alkaline suspensions containing high fines (particles < 44… (more)

▼ Mature Fine tailings (MFTs) are the byproducts from the mineral processing operations of bitumen mining. They are alkaline suspensions containing high fines (particles < 44 μm) content. Dewatering and consolidation of MFTs are important for both recycle of water to the oil extraction units and reclamation of clay. However, those are difficult to achieve by sedimentation alone due to low hydraulic conductivity of the tailings. In this dissertation, we have looked at how different surface phenomena like colloidal destabilization and electrokinetic transport mechanisms can bring about water separation in MFTs. Suppression of charges on a colloidal particle electrostatically to allow aggregation has always been a popular means of dewatering the tailings. In this study, we used several versions of a commercial coagulant with non-ionic and anionic polymeric flocculants to treat three different extraction tailings obtained from the respective resources. The polymers were tested for their ability to flocculate the tailings by zeta potential and floc size measurements. Diffusiophoresis is a well-understood flow mechanism that can produce micro-flows even in the inaccessible micro and nano-channels present in a porous medium, for e.g. the concentrated tailings deposits. In our system of MFTs, we observed that flows induced by ionic gradients due to dissolution of inorganic salts like calcium carbonate aid dewatering by a phenomenon called diffusioosmosis. The role of such flows in enhanced dewatering of MFTs is explored in this study in great detail. Thus, the above methods, though governed by different scientific mechanisms, are primarily dependent on the surface charge of the tailings. Although, the results presented here may not give a direct comparison between the dewatering efficiencies for each of these studied methods, but can definitely help us appreciate the fact that both of them can simultaneously be utilized towards achieving better water separation from the tailings and therefore improved consolidation of clay sediments. Advisors/Committee Members: Darrell Velegol, Thesis Advisor/Co-Advisor.

Subjects/Keywords: mature fine tailings; dewatering; destabilization; diffusioosmosis; layering and consolidation.

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APA (6^th Edition):

Basu, A. (2013). Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/18853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Basu, Anwesha. “Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings.” 2013. Thesis, Penn State University. Accessed January 26, 2021. https://submit-etda.libraries.psu.edu/catalog/18853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Basu, Anwesha. “Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings.” 2013. Web. 26 Jan 2021.

Vancouver:

Basu A. Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Jan 26]. Available from: https://submit-etda.libraries.psu.edu/catalog/18853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Basu A. Electrostatic & Electrokinetic Dewatering Of Mature Fine Tailings. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/18853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

24. Whittington, Peter. The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands.

Degree: 2013, University of Waterloo

URL: http://hdl.handle.net/10012/7352

► Approximately 7000 to 8000 years ago when Hudson Bay became ice-free the Tyrrell Sea flooded the Hudson basin and deposited fine grained marine sediments overlaying… (more)

▼ Approximately 7000 to 8000 years ago when Hudson Bay became ice-free the Tyrrell Sea flooded the Hudson basin and deposited fine grained marine sediments overlaying the previous glacial tills. Coincident with the ablation of the ice sheet isostatic rebound occurred causing regression of the Tyrell Sea and the emergence of a flat, relatively impermeable surface that would eventually host one of the world’s largest wetlands: the Hudson Bay Lowlands. The low permeability marine sediments and low regional slope reduced recharge and runoff, respectively, so that basal tidal marshes were established, and with isostatic up lift were eventually replaced by swamp forests and then forested and non-forested bogs. Recent discovery of kimberlite (diamondiferous) pipes in an area of the lowlands has led the development of an open-pit diamond mine which requires dewatering of the regional aquifer. Dewatering is depressurizing the surrounding Silurian bedrock that underlies the marine sediments. It was hypothesized that these marine sediments would act as a confining layer, isolating the overlying peatlands from the regional bedrock aquifer. We tested this hypothesis by instrumenting a 1.5 km long transect located within the zone of the mine’s influence that crossed various bogs and fens overlying these marine sediments, and was anchored at both ends by bedrock outcrops (bioherms), which represented areas of no marine sediment. Along this transect wells and piezometers were installed within the peat profile and upper marine sediments and bedrock to determine changes in water table and hydraulic head. The exposed bedrock outcrops (bioherms) did act as local drainage nodes, however, this effect was limited to ~30 m, beyond which water tables and hydraulic heads were similar to a control site located 25 km away. However, within this 30 m zone daily losses of water by the enhanced recharge often exceeded those of evapotranspiration (~3mm/day) representing a major local loss of water to the system. It is the distance to bedrock, rather than distance to bioherm, that determines strength of recharge. In areas of thinner marine sediments the daily fluxes were similar (but less) than those in the areas directly surrounding the bioherms, despite being 100s of meters away from the bioherms. The stratigraphy surrounding the bioherms lead to complicated flow regimes with higher conductivity layers (e.g., sands) circumventing the lower permeability marine sediments which may help extend the effect of the bioherms beyond the 30 m distance. The drying peat around the bioherms, and the elevated nature of the bioherms in a flat landscape, put them at increased risk for lighting strikes and thus fires; however, very little viable fuel exists in the peatlands around the bioherms and any fires that might occur would be confined to the bioherm and not spread into the surrounding peatland. Overall, at least within the first 5 years of aquifer dewatering, seasonal weather played the dominant role in affecting the hydrology of the peatlands; a heavy snow…

Subjects/Keywords: Peatlands; aquifer dewatering; Hudson James Bay Lowlands; Hydrology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Whittington, P. (2013). The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/7352

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Whittington, Peter. “The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands.” 2013. Thesis, University of Waterloo. Accessed January 26, 2021. http://hdl.handle.net/10012/7352.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Whittington, Peter. “The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands.” 2013. Web. 26 Jan 2021.

Vancouver:

Whittington P. The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands. [Internet] [Thesis]. University of Waterloo; 2013. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10012/7352.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Whittington P. The Impacts of Diamond Mining to Peatlands in the James Bay Lowlands. [Thesis]. University of Waterloo; 2013. Available from: http://hdl.handle.net/10012/7352

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

25. Mayindza Mouandza, Mariette. Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use.

Degree: Docteur es, Geographie, 2018, Lyon

URL: http://www.theses.fr/2018LYSES019

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Les premiers essais agricoles dans les terres basses de la Guyane française commencent dès 1763 sur les côtes de Kourou. Ce fut le début d’une… (more)

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Les premiers essais agricoles dans les terres basses de la Guyane française commencent dès 1763 sur les côtes de Kourou. Ce fut le début d’une entreprise qui, sous la forme de dents de scie, va marquer l’économie de cette colonie française de l’Amérique du sud jusqu’à nos jours. Les terres noyées de la Guyane française, sont toutes localisées sur la bande côtière et correspondent à des zones humides (tourbières, mangroves, marais). Au début de la colonisation, en 1604 précisément, les Français se sont établis sur l’île de Cayenne, et ont occupés les terres hautes, situées plus à l’intérieur du continent. L’agriculture de ces terres a débuté à la même période, selon le modèle d’agriculture sur brûlis développé par les autochtones. Ce modèle traditionnel convenait à la production des denrées alimentaires pour des petits groupes. Néanmoins, au bout d’un siècle, leur rendement ne satisfaisait plus au commerce de la colonie. L’épuisement ou la faible productivité de ces terres hautes à la fin du XVIIIeme siècle, a ainsi occasionné une ruée ver les terres basses. Le développement de ces terres noyées avait déjà été entrepris par les Hollandais (Guyane hollandaise), mais ces zones humides rebutaient encore les Colons-Planteurs en Guyane française. Dès l’arrivée de V. Malouet (nouvel intendant de la colonie) vers 1778, les techniques d’assèchement et de construction de polders se développent en Guyane française sous la direction de l’ingénieur J. S. Guisan. Ce dernier essaya de faire des terres noyées, la réponse aux problèmes agricoles de la Guyane française. Mais, les différents évènements socio-politiques qui touchèrent la France à cette époque (Révolution française, abolition de l’esclavage, activités aurifères), mirent fin dès 1848 à cette entreprise. Certaines contraintes climatiques doivent également être considérées. Un siècle plus tard, vers 1950 avec le lancement du plan vert, les rizières de Mana témoignent encore de l’importance de la culture des terres basses en Guyane française.

The first agricultural trials in the lowlands of French Guyana started in AD 1763 on Kourou coasts. It was the beginning of an initiative that will mark the economy of this French colony of South America until today. The flooded lands of French Guyana are all located on the coastal strip. This area is composed of wetlands (peatlands, mangrove and swamps). At the beginning of colonisation, in AD 1604 exactly, French people established themselves on the Cayenne Island and on the uplands (mainland). The cultivation of these uplands started at the same time, adopting the slash-and-burn agriculture developed by autochthonous people. More, this agricultural model was butter suited to foodstuffs production for small groups. However, early in the century, their performance no longer satisfied trade of the colony. Depletion or low production of these uplands at the end of the XVIIIth century, caused a rush to the lowlands. The development of these low lands has already been undertaken by the Dutch (Dutch Guyana), but these wetlands were still…

Advisors/Committee Members: Cubizolle, Hervé (thesis director).

Subjects/Keywords: Guyane Française; Agriculture; French Guyana; Lowlands; Polders; Dewatering techniques; Peatlands

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mayindza Mouandza, M. (2018). Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2018LYSES019

Chicago Manual of Style (16^th Edition):

Mayindza Mouandza, Mariette. “Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use.” 2018. Doctoral Dissertation, Lyon. Accessed January 26, 2021. http://www.theses.fr/2018LYSES019.

MLA Handbook (7^th Edition):

Mayindza Mouandza, Mariette. “Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use.” 2018. Web. 26 Jan 2021.

Vancouver:

Mayindza Mouandza M. Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use. [Internet] [Doctoral dissertation]. Lyon; 2018. [cited 2021 Jan 26]. Available from: http://www.theses.fr/2018LYSES019.

Council of Science Editors:

Mayindza Mouandza M. Aménagement des milieux humides de la Guyane française depuis le XVIIIème siècle jusqu'à nos jours : difficultés techniques, jeux d'acteurs et conflits d'usage : Management of French Guiana wetlands since the 18th century to the present day : technical difficulties, games of actors and conflicts of use. [Doctoral Dissertation]. Lyon; 2018. Available from: http://www.theses.fr/2018LYSES019

University of Ottawa

26. Kinsley, Christopher. Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates .

Degree: 2016, University of Ottawa

URL: http://hdl.handle.net/10393/35111

► The Government of Ontario plans to ban the land application of untreated septage; however, most town wastewater treatment plants do not have the capacity to… (more)

▼ The Government of Ontario plans to ban the land application of untreated septage; however, most town wastewater treatment plants do not have the capacity to accept septage. A combined reed bed – freezing bed technology has been successfully developed to dewater and treat septage. Lab column studies established that freeze-thaw conditioning can restore drainage in clogged sand drying beds dosed with common biological sludges and that septage can be dosed at 10 cm/week for 2.5-5.0 months before clogging is observed. Pilot studies showed that freezing beds can operate without the need for a cover with the applied sludge effectively melting any snow cover in regions with moderate snowfall. Septage freezing was successfully modelled following an accepted model for ice formation on water bodies while septage thawing was modelled using a regression analysis with initial frozen depth and precipitation found to be insignificant and degree days of warming controlling the rate of thawing. Model results were utilized to produce a freezing bed design loading map for North America based on temperature normals. Field scale planted and unplanted reed bed – freezing bed systems were constructed and tested with varying hydraulic loading rates (1.9-5.9 m/y) and solid loading rates (43-144 kg/m2/y) over a 5 year period resulting in a recommended design hydraulic loading rate of 2.9 m/y or 75 kg/m2/y. Drainage rates doubled after freeze-thaw conditioning compared to during the growing season, suggesting that freeze-thaw conditioning restores filter hydraulic conductivity. No effect of solid loading rate, planted versus unplanted filters and 7 versus 21 d dosing cycles on filter drainage was observed; however, drainage varied significantly with hydraulic loading rate. The filters separated almost all contaminants with filtrate equivalent to a low-strength domestic wastewater which can be easily treated in any municipal or decentralized wastewater system. The dewatered sludge cake had similar nutrient and solid content to a solid dairy manure and met biosolid land application standards in terms of metals and pathogens. The combined reed bed-freezing bed technology can provide a low-cost solution for the treatment and reuse of septage in cold-climate regions.

Subjects/Keywords: sludge dewatering; septage; reed bed; freezing bed; freeze-thaw conditioning

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APA (6^th Edition):

Kinsley, C. (2016). Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates . (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/35111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kinsley, Christopher. “Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates .” 2016. Thesis, University of Ottawa. Accessed January 26, 2021. http://hdl.handle.net/10393/35111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kinsley, Christopher. “Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates .” 2016. Web. 26 Jan 2021.

Vancouver:

Kinsley C. Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates . [Internet] [Thesis]. University of Ottawa; 2016. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10393/35111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kinsley C. Development of a Combined Reed Bed – Freezing Bed Technology to Treat Septage in Cold Climates . [Thesis]. University of Ottawa; 2016. Available from: http://hdl.handle.net/10393/35111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Boullosa Allariz, Beatriz. Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments.

Degree: Docteur es, Génie civil, 2018, Normandie

URL: http://www.theses.fr/2018NORMC285

►

Les opérations de dragage génèrent d’importants volumes de sédiments à teneur en eau élevée qui sont difficilement transportables. Toute opération de valorisation ou stockage des… (more)

▼

Les opérations de dragage génèrent d’importants volumes de sédiments à teneur en eau élevée qui sont difficilement transportables. Toute opération de valorisation ou stockage des sédiments implique de réduire la teneur en eau. Le séchage naturel et la déshydratation mécanisée des sédiments répondent à cette attente. Le séchage naturel des sédiments est la technique de déshydratation la plus économique et la meilleure du point de vue environnemental. Le temps de séchage peut être réduit par des moyens techniques adaptés (retournement, scarification) mis en action par l'application de critères d’aptitude au séchage naturel. Pour ce faire, le processus de séchage naturel a été reproduit à l’échelle du laboratoire à l’aide d’essais d’Égouttage et de Séchage et d’essais de Séchage et de Retrait couplés à des essais scissométriques. Ils ont porté sur neuf sédiments : sept sédiments de barrage, deux sédiments marins et une kaolinite. Une relation Su=f(IP) a été établie. Cette relation permet d’obtenir la cohésion non drainée Su à partir d’une mesure de teneur en eau. Elle permet aussi de définir ou cerner le moment le plus propice au retournement des sédiments à l’aide d’engins spécifiques sur site. Une autre méthode mécanique pour réduire le temps de séchage est suggérée. Il s'agit de pratiquer une scarification des sédiments à l’aide d’outils mobiles, voire robotisés, comme un rouleau scarificateur ou d'une rangée d'outils transportés par un treillis mobile adapté. En ce qui concerne la déshydratation mécanisée des sédiments, une nouvelle méthode de déshydratation en continu a été proposée à partir d'une presse à boues KDS®. Pour des raisons de conception et d'application, la presse à boues KDS® n’a jamais été utilisée pour déshydrater des sédiments. Un plan expérimental a été développé. Il est démontré que la presse KDS® est capable de déshydrater un sédiment fin sableux sans une maintenance démesurée. Des adaptations de la presse KDS® à la déshydratation de sédiments et des améliorations sont finalement proposées.

Dredging operations produce large amounts of sediments with high water content, that are difficult to handle. Storage management and future reuses need to reduce the water content of sediments. Natural and mechanical dewatering of sediments meet this need. The most economic and eco-friendly method of dewatering is natural dewatering. Dewatering period can be reduced with suitable technical means such as adapted plough or scarifier for sediments, operating under defined dewatering criteria. The natural dewatering process was investigated and reproduced at the laboratory scale by performing Natural dewatering test and Shrinkage test coupled with shear measurements (vane shear testing). Nine sediments have been considered: seven dam sediments, two marine sediments and a kaolinite clay. A relationship Su = f(IP) has been established. It allows to deduce the undrained shear strength Su from only a measurement of water content. It allows to state on the right moment to put in operation the specific tools for…

Advisors/Committee Members: Levacher, Daniel (thesis director).

Subjects/Keywords: Séchage naturel; Déshydratation mécanisée; Processus de séchage; Crtères d’aptitude; Presse à boues KDS®; Cohésion non drainée; Sediments; Natural dewatering; Mechanical dewatering; Dewatering process; Dewatering ability criteria; KDS® press; Water content; Undrained shear strength; Flocculation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Boullosa Allariz, B. (2018). Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments. (Doctoral Dissertation). Normandie. Retrieved from http://www.theses.fr/2018NORMC285

Chicago Manual of Style (16^th Edition):

Boullosa Allariz, Beatriz. “Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments.” 2018. Doctoral Dissertation, Normandie. Accessed January 26, 2021. http://www.theses.fr/2018NORMC285.

MLA Handbook (7^th Edition):

Boullosa Allariz, Beatriz. “Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments.” 2018. Web. 26 Jan 2021.

Vancouver:

Boullosa Allariz B. Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments. [Internet] [Doctoral dissertation]. Normandie; 2018. [cited 2021 Jan 26]. Available from: http://www.theses.fr/2018NORMC285.

Council of Science Editors:

Boullosa Allariz B. Déshydratation naturelle et mécanisée de sédiments : étude des processus mis en jeu et applications : Natural and mechanical Dewatering of sediments. [Doctoral Dissertation]. Normandie; 2018. Available from: http://www.theses.fr/2018NORMC285

North-West University

28. Smith, Tinus. Automated control of mine dewatering pumps / Tinus Smith .

Degree: 2014, North-West University

URL: http://hdl.handle.net/10394/15556

► Deep gold mines use a vast amount of water for various purposes. After use, the water is pumped back to the surface. This process is… (more)

▼ Deep gold mines use a vast amount of water for various purposes. After use, the water is pumped back to the surface. This process is energy intensive. The control is traditionally done with manual interventions. The purpose of this study is to investigate the effects of automated control on mine dewatering pumps. Automating mine dewatering pumps may hold a great number of benefits for the client. The benefits include electricity cost savings through load shifting, as well as preventative maintenance and pump protection procedures. By automating pumps, the client will benefit from operating more cost effectively and realising electricity cost savings. The equipment needed for pump automation and the procedures involved in the process are discussed as part of this study. A DSM project was implemented in the form of a pump automation project. All safety and quality procedures were followed and training was provided where needed to ensure that personnel understand their duties and responsibilities. This ensures the sustainability of the project after completion. The performance of the project was tested in manual mode, manual scheduled control, manual scheduled surface control and auto control. Manual intervention achieved the highest electricity cost saving of R8.25 million (11.4 MW load shift saving). To achieve this saving the system was exhausted to a point where columns and infrastructure started failing. Auto intervention achieved an electricity cost saving of R5.57 million (7.7 MW load shift savings). The auto intervention achieved a lower electricity cost savings compared to the manual intervention. However, taking all factors into account, such as the damage to infrastructure after a period of manual control, the auto intervention proved the best balance for controlling mine dewatering pumps to achieve savings on the cost of electricity and system sustainability for optimal control. Automated systems can avoid system overload and protect the infrastructure from exhaustion.

Subjects/Keywords: Automation; Mine dewatering pumps; Control; Clear water pumping; DSM

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APA (6^th Edition):

Smith, T. (2014). Automated control of mine dewatering pumps / Tinus Smith . (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/15556

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Smith, Tinus. “Automated control of mine dewatering pumps / Tinus Smith .” 2014. Thesis, North-West University. Accessed January 26, 2021. http://hdl.handle.net/10394/15556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Smith, Tinus. “Automated control of mine dewatering pumps / Tinus Smith .” 2014. Web. 26 Jan 2021.

Vancouver:

Smith T. Automated control of mine dewatering pumps / Tinus Smith . [Internet] [Thesis]. North-West University; 2014. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10394/15556.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Smith T. Automated control of mine dewatering pumps / Tinus Smith . [Thesis]. North-West University; 2014. Available from: http://hdl.handle.net/10394/15556

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North-West University

29. Van Rensburg, Martha Johanna. Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg .

Degree: 2014, North-West University

URL: http://hdl.handle.net/10394/15902

► Fluidised bed drying is currently receiving much attention as a dewatering option after the beneficiation of fine coal (defined in this study as between 1mm… (more)

▼ Fluidised bed drying is currently receiving much attention as a dewatering option after the beneficiation of fine coal (defined in this study as between 1mm and 2mm particles). The aim of this study was to investigate the removal of moisture from fine coal by using air at relatively low temperatures of between 25°C and 60°C within a controlled environment by lowering of the relative humidity of air. The first part of the experimental work was completed in a controlled climate chamber with the coal samples in a static non-fluidised state. Drying in the second part was carried out using a fluidised bed with conditioned air as the fluidising medium. Introduction of airflow to the system led to a lower moisture content in the coal samples and it also proved to have the ability to increase the drying rate. It was determined that the airflow had the ability to remove more free moisture from the filter cake. In addition more inherent moisture could also be removed by using upward flowing air, resulting in a lower equilibrium moisture content. It was proven that the airflow rate and relative humidity of the drying air contributed to faster drying rates. The effect of temperature was not as significant as expected, but higher temperatures did increase the drying rate at higher airflow and lower humidity conditions. The larger surface areas of particles create surface and capillary forces that prevent the moisture from leaving the finer coal particles. It was found that the rate of drying is independent of the moisture content in the coal sample. Just in terms of the fastest drying time and drying rate in the fluidised bed, it was concluded that the most efficient conditions is airflow above minimum fluidisation point causing vigorous mixing and maximum contact with the drying air. In addition to the high airflow it was concluded that 30% relative humidity and 55°C resulted in the fastest drying time. All the drying processes at all the airflow rates, temperature and relative humidity conditions were energy efficient. This process was shown to be energy positive, resulting in an overall energy gain. The overall energy consumption for the fluidised bed is lower than for all the dryer systems compared to and it compared favourably with other thermal drying technologies. It was therefore shown that this is a viable technology for the dewatering of fine coal.

Subjects/Keywords: Dewatering; Drying; Fine coal; Fluidised bed; Warm air

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Van Rensburg, M. J. (2014). Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg . (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/15902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Van Rensburg, Martha Johanna. “Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg .” 2014. Thesis, North-West University. Accessed January 26, 2021. http://hdl.handle.net/10394/15902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Van Rensburg, Martha Johanna. “Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg .” 2014. Web. 26 Jan 2021.

Vancouver:

Van Rensburg MJ. Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg . [Internet] [Thesis]. North-West University; 2014. [cited 2021 Jan 26]. Available from: http://hdl.handle.net/10394/15902.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Van Rensburg MJ. Drying of fine coal using warm air in a dense medium fluidised bed / Martha Johanna van Rensburg . [Thesis]. North-West University; 2014. Available from: http://hdl.handle.net/10394/15902

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cranfield University

30. Fane, Sarah Elizabeth. Control of E.coli in biosolids.

Degree: PhD, 2016, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/11815

► Achieving microbial compliance levels in biosolids storage is complicated by the unpredictable increase of Escherichia coli (E. coli), which serves as an important indicator for… (more)

▼ Achieving microbial compliance levels in biosolids storage is complicated by the unpredictable increase of Escherichia coli (E. coli), which serves as an important indicator for pathogen presence risk. Meeting required microbial specifications validates sludge treatment processes and ensures that a safe product is applied to agricultural land. Controlled indicator monitoring provides confidence for farmers, retailers and the food industry, safeguarding the sludge-to-land application route. Following mechanical dewatering biosolids products are stored before microbial compliance testing permits agricultural application. During storage, concentrations of E. coli bacteria can become elevated and prevent the product from meeting the conventional or enhanced levels of treatment outlined in The Safe Sludge Matrix guidelines. Literature research identified innate characteristics of sludge and ambient environmental parameters of storage which are factors likely to influence E. coli behaviour in stored biosolids. The research hypothesis tested whether E. coli growth and death in dewatered sewage sludge can be controlled by the modification of physical-chemical factors in the cake storage environment. Parameters including nutrient availability, temperature, moisture content and atmospheric influences were investigated through a series of laboratory-scale experiments. Controlled dewatering and the assessment of modified storage environments using traditional microbial plating and novel flow cytometry analysis have been performed. At an operational scale, pilot trials and up-scaled monitoring of the sludge storage environment have been conducted enabling verification of laboratory results. Understanding the dynamics of cell health within the sludge matrix in relation to nutrient availability has provided a valuable understanding of the mechanisms that may be affecting bacterial growth post-dewatering. The importance of elevated storage temperatures on E. coli death rates and results showing the benefits of a controlled atmosphere storage environment provide important considerations for utilities.

Subjects/Keywords: Biosolids; Compliance; Safe sludge matrix; Storage; Mechanical dewatering; Temperature; Cell disruption

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fane, S. E. (2016). Control of E.coli in biosolids. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/11815

Chicago Manual of Style (16^th Edition):

Fane, Sarah Elizabeth. “Control of E.coli in biosolids.” 2016. Doctoral Dissertation, Cranfield University. Accessed January 26, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/11815.

MLA Handbook (7^th Edition):

Fane, Sarah Elizabeth. “Control of E.coli in biosolids.” 2016. Web. 26 Jan 2021.

Vancouver:

Fane SE. Control of E.coli in biosolids. [Internet] [Doctoral dissertation]. Cranfield University; 2016. [cited 2021 Jan 26]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11815.

Council of Science Editors:

Fane SE. Control of E.coli in biosolids. [Doctoral Dissertation]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/11815

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Open Access Theses and Dissertations