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You searched for subject:(municipal wastewaters). Showing records 1 – 3 of 3 total matches.

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Utah State University

1. Kesaano, Maureen. Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters.

Degree: MS, Civil and Environmental Engineering, 2011, Utah State University

The use of duckweed as a nutrient removal option for municipal wastewaters can only be realized through regular plant harvesting. As a result, the nutrient-rich biomass generated needs to be effectively managed and disposed of. This study looked at three alternative options for biomass management that would make duckweed-based nutrient removal systems sustainable and attractive to small communities like Wellsville City, Utah. The options included: the use of harvested duckweed biomass as an animal feed, anaerobic digestion of duckweed for methane production, and fermentation of biomass for ethanol production. Duckweed feed quality was determined using feed analysis reports and results from digestibility studies (in vitro fermentation). The performance of the anaerobic digestion process was determined by monitoring pH, VS, TS, NH4-N, VFAs, and alkalinity. The ethanol production yields were obtained from starch content values and ethanol concentrations observed from batch fermentation experiments. Duckweed was composed of 21 - 38% crude protein, 94 - 96% water, 78.5% organic matter, < 10% starch and an average of 19% starch after accumulation by nutrient starvation. Relative feed values (RFVs) of 230 - 241, crude protein content of 21-38%, and neutral and acid detergent fiber values of 30.2% and 13.7%, respectively, showed duckweed as a potential feed for ruminants comparable to alfalfa and corn silage (RFVs of 100). Digester performance showed an average methane yield of 6.3 and 5.8 ft3/lb VS destroyed with methane composition values of 67.1% and 62.5% for fresh DW fed reactor (R1) and air dried DW fed reactor (R2), respectively. The ethanol production yield observed was less than 100 mg ethanol/g DW for both fresh and oven dried DW samples. The recommended duckweed biomass management option for a small community like Wellsville is anaerobic digestion because it is a source of energy and at the same time the digestate can be used as a low-quality feed. Advisors/Committee Members: R. Ryan Dupont, ;.

Subjects/Keywords: sustainable managment; duckweed; biomass; nutrient control; municipal wastewaters; Environmental Engineering

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

APA (6th Edition):

Kesaano, M. (2011). Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/879

Chicago Manual of Style (16th Edition):

Kesaano, Maureen. “Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters.” 2011. Masters Thesis, Utah State University. Accessed July 17, 2019. https://digitalcommons.usu.edu/etd/879.

MLA Handbook (7th Edition):

Kesaano, Maureen. “Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters.” 2011. Web. 17 Jul 2019.

Vancouver:

Kesaano M. Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters. [Internet] [Masters thesis]. Utah State University; 2011. [cited 2019 Jul 17]. Available from: https://digitalcommons.usu.edu/etd/879.

Council of Science Editors:

Kesaano M. Sustainable Management of Duckweed Biomass Grown for Nutrient Control in Municipal Wastewaters. [Masters Thesis]. Utah State University; 2011. Available from: https://digitalcommons.usu.edu/etd/879


Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

2. Bourliva, Anna. Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα.

Degree: 2013, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

The provocation of disorders in the aquatic ecological system by the presenceof toxic heavy metals is an important and common environmental problem whichrequires effective methods to solve it. The main methods of removing toxic metals(chemical precipitation, oxidation or reduction, filtration, electrochemical treatmentetc.) have been studied extensively in a variety of applications and remain highlyinefficient and costly, particularly when treating large volumes of solutionscontaining low concentrations of metals. The adsorption with the utilization ofnatural materials, such as clay minerals and rocks, is an alternative method moreeffective and especially more economical to achieve the highest possible degree ofenvironmental protection.Taking into account that Greece is one of the largest producers of naturalclays such as bentonite (Milos island) and attapulgite (Grevena) or presents majoroccurrences such as vermiculite (Askos) and since their adsorptive behavior has beenlimited investigated, it is necessary the thorough investigation of the adsorptivecapacity, both at a research level and at the level of practical applications. Thesubject of this research was the utilization of natural clays as adsorbents for theremoval of heavy metals, in single and multi component systems, from aqueoussolutions and municipal and industrial wastewaters.The present research contains the characterization of the natural clays andthe investigation of their removal efficiency and the factors affecting it. Thecharacterization of the adsorbents involved the determination of their mineralogicaland chemical composition, their morphological characteristics, the determination oftheir ion exchange capacity and specific surface area and was based on analyticaltechniques such as XRD, FTIR, DTA / TG, AAS, SEM / EDS and BET. Mineralogically theadsorbents were characterized by high concentrations of clay phases (> 85%) andsmall amounts of non‐clay minerals such as quartz, calcite and pyrite. The ionexchange capacity of the natural clays was determined ranging between66.96cmol/kg and 86.52cmol/kg for bentonite samples, while it was 57.62cmol/kgfor attapulgite and 128.34cmol/kg for the vermiculite. The specific surface area values varied from 66.57m2/g to 87.29m2/g for bentonite samples, while it was148.23m2/g and 16.99m2/g for attapulgite and vermiculite, respectively.The main part of the research involved the equilibrium and kinetic study forthe removal of heavy metals cadmium (Cd2+), lead (Pb+2), nickel (Ni+2), copper (Cu+2)and zinc (Zn+2) in single and multi component systems. The effect of parameters suchas contact time, adsorbent amount, pH and metal concentration on the removalefficiency was investigated. The adsorption capacity (qe) increased with increasing ofcontact time, pH and metal concentration, while decreased with increasing of clayamount.Particularly important for the industrial application of the method was theincreased removal percentages in low initial concentrations which resulted inequilibrium concentrations lower than the…

Subjects/Keywords: Αργιλικά ορυκτά; Βαρέα μέταλλα; Προσρόφηση; Αστικά λύματα; Βιομηχανικά απόβλητα; Κινητικά μοντέλα; Σχεδιασμός διεργασίας; Οικονομική ανάλυση; Clay minerals; Heavy metals; Adsorption; Municipal wastewaters; Industrial wastewaters; Kinetic models; Process design; Economic analysis

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

APA (6th Edition):

Bourliva, A. (2013). Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/34826

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

Chicago Manual of Style (16th Edition):

Bourliva, Anna. “Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα.” 2013. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed July 17, 2019. http://hdl.handle.net/10442/hedi/34826.

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

MLA Handbook (7th Edition):

Bourliva, Anna. “Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα.” 2013. Web. 17 Jul 2019.

Vancouver:

Bourliva A. Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2013. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/10442/hedi/34826.

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

Council of Science Editors:

Bourliva A. Χρήση φυσικών αργίλων στην απομάκρυνση βαρέων μετάλλων από υδατικά διαλύματα και αστικά και βιομηχανικών λύματα. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2013. Available from: http://hdl.handle.net/10442/hedi/34826

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


Universidade do Rio Grande do Sul

3. Konarzewski, Vitor Hugo Cordeiro. Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas.

Degree: 2009, Universidade do Rio Grande do Sul

Efluentes contaminados por lixiviados de resíduos sólidos urbanos (LRSU), proveniente de aterros sanitários, ou a drenagem ácida de minas (DAM), originados pela oxidação da pirita em rejeitos de carvão, são problemas atuais em termos de impacto ambiental, especialmente na região do Município de Butiá, no Estado do Rio Grande do Sul. O tratamento destes efluentes, via de regra, é bastante oneroso, mas necessário, uma vez que a liberação in natura destas fontes poluidoras pode ser responsável pela degradação severa do ambiente. Em geral, metodologias convencionais de tratamento (como a precipitação/sedimentação, no caso da DAM, e processos biológicos, no caso do LRSU) mostram-se economicamente custosas ou tecnicamente deficientes. Frente a este desafio, esta pesquisa baseou-se na avaliação do tratamento conjunto de DAM e LRSU, via homogeneização, a fim de diminuir custos tradicionais decorrentes. O processo consiste no aproveitamento da alcalinidade do LRSU para neutralizar a acidez da DAM. Ao mesmo tempo, o ferro e o alumínio presentes na DAM permitem a coagulação dos sólidos suspensos, removendo uma significativa carga de poluentes. Resultados obtidos em laboratório no tratamento inicial destes efluentes permitiram uma significativa redução de carga orgânica, nutrientes, metais pesados e bactérias do grupo coliforme. O efluente final apresentou redução na carga lançada de 100% para sólidos suspensos, 36% para DBO, 56% para DQO, 11% para N, 72% para Fe, 73% para Al e 9% para Mn, atenuando suas características iniciais em consonância a alguns padrões de emissão de efluentes líquidos estabelecidos para o Estado do Rio Grande do Sul (Resolução número 128/2006 do CONSEMA).

Municipal landfills wastewaters (MLW) and acid mine drainages (AMD) from coal mines are environmental issues faced, in special case at the city of Butia, in Rio Grande do Sul State. The treatment of such effluents is necessary to avoid undesirable environmental degradation. The conventional treatment techniques (e.g. chemical neutralization for DAM and biological processes for municipal landfills wastewaters) are costly and sometimes inefficient. This work considered a new alternative based in the combined treatment of MLW and AMD. The alkalinity of MLW can neutralize the acidity of the AMD while the iron and aluminum present in the AMD allow the coagulations of the suspended solids of the MLW, reducing considerably the amount of pollutants. The initial results obtained at laboratory scale allowed the reduction of organic load, nutrients, heavy metals and bacteria. The final effluent showed reduction at the charge reaching 100% to solids in suspension, 36% to BOD, 56% to COD, 11% to N, 72% to Fe, 73% to Al e 9% to Mn, without addiction of coagulations polymers, and improving its characteristics considering the emission standards established in the Rio Grande do Sul State, Brazil (Resolution number 128/2006 from CONSEMA).

Advisors/Committee Members: Schneider, Ivo Andre Homrich.

Subjects/Keywords: Drenagem ácida de minas; Municipal landfill wastewaters; Tratamento de efluentes; Acid mine drainage; Aterro sanitário; Wastewater treatment

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

APA (6th Edition):

Konarzewski, V. H. C. (2009). Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/60661

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

Chicago Manual of Style (16th Edition):

Konarzewski, Vitor Hugo Cordeiro. “Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas.” 2009. Thesis, Universidade do Rio Grande do Sul. Accessed July 17, 2019. http://hdl.handle.net/10183/60661.

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

MLA Handbook (7th Edition):

Konarzewski, Vitor Hugo Cordeiro. “Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas.” 2009. Web. 17 Jul 2019.

Vancouver:

Konarzewski VHC. Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2009. [cited 2019 Jul 17]. Available from: http://hdl.handle.net/10183/60661.

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

Council of Science Editors:

Konarzewski VHC. Tratamento combinado de lixiviados de aterro sanitário e drenagem ácida de minas. [Thesis]. Universidade do Rio Grande do Sul; 2009. Available from: http://hdl.handle.net/10183/60661

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

.