Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(Filtration ionic strength). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Uppsala University

1. Hedayati, Maryeh. Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media.

Degree: Earth Sciences, 2014, Uppsala University

Carbon –based engineered nanoparticles have been widely used due to their small size and uniquephysical and chemical properties. They can dissolve in water, transport through soil and reach drinkingwater resources. The toxic effect of engineered nanoparticles on human and fish cells has beenobserved; therefore, their release and distribution into the environment is a subject of concern. In thisstudy, two types of engineered nanoparticles, multi-walled carbon nano-tubes (MWCNT) and C60 withcylindrical and spherical shapes, respectively, were used. The aim of this study was to investigatetransport and retention of carbon-based engineered and natural nanoparticles through saturated porousmedia. Several laboratory experiments were conducted to observe transport behavior of thenanoparticles through a column packed with sand as a representative porous media. The columnexperiments were intended to monitor the effect of ionic strength, input concentration and the effect ofparticle shape on transport. The results were then interpreted using Derjaguin-Landau-Verwey-Overbeak (DLVO) theory based on the sum of attractive and repulsive forces which exist betweennanoparticles and the porous medium. It was observed that as the ionic strength increased from 1.34mM to 60 mM, the mobility of the nanoparticles was reduced. However, at ionic strength lower than10.89 mM, mobility of C60 was slightly higher than that of MWCNTs. At ionic strength of 60 mMMWCNT particles were significantly more mobile. It is rather difficult to relate this difference to theshape of particle and further studies are required.The effect of input concentration on transport of MWCNTs and C60 was observed in bothmobility of the particle and shape of breakthrough curves while input concentration was elevated from7 mg/l to 100 mg/l. A site-blocking mechanism was suggested to be responsible for the steep andasymmetric shape of the breakthrough curves at the high input concentration.Furthermore inverse modeling was used to calculate parameters such as attachment efficiency,the longitudinal dispersivity, and capacity of the solid phase for the removal of particles. The inversionprocess was performed in a way that the misfit between the observed and simulated breakthroughcurves was minimized. The simulated results were in good agreement with the observed data.

Subjects/Keywords: Nanoparticle; MWCNT; C60; Transport and mobilization; DLVO theory; Ionic strength; Input concentration; Clean-bed filtration theory; Column test; Oceanography, Hydrology and Water Resources; Oceanografi, hydrologi och vattenresurser

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Hedayati, M. (2014). Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233631

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):

Hedayati, Maryeh. “Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media.” 2014. Thesis, Uppsala University. Accessed February 28, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233631.

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

MLA Handbook (7th Edition):

Hedayati, Maryeh. “Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media.” 2014. Web. 28 Feb 2021.

Vancouver:

Hedayati M. Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media. [Internet] [Thesis]. Uppsala University; 2014. [cited 2021 Feb 28]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233631.

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

Council of Science Editors:

Hedayati M. Mobilization and transport of different types of carbon-based engineered and natural  nanoparticles through saturated porous media. [Thesis]. Uppsala University; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233631

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

2. Kazemi, Amir Sadegh. Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications.

Degree: PhD, 2018, McMaster University

Membrane filtration processes are widely utilized across different industrial sectors for biological and environmental separations. Examples of the former are sterile filtration and protein fractionation via microfiltration (MF) and ultrafiltration (UF) while drinking water treatment, tertiary treatment of wastewater, water reuse and desalination via MF, UF, nanofiltration (NF) and reverse-osmosis (RO) are examples of the latter. A common misconception is that the performance of membrane separation is solely dependent on the membrane pore size, whereas a multitude of parameters including solution conditions, solute concentration, presence of specific ions, hydrodynamic conditions, membrane structure and surface properties can significantly influence the separation performance and the membrane’s fouling propensity. The conventional approach for studying filtration performance is to use a single lab- or pilot-scale module and perform numerous experiments in a sequential manner which is both time-consuming and requires large amounts of material. Alternatively, high-throughput (HT) techniques, defined as the miniaturized version of conventional unit operations which allow for multiple experiments to be run in parallel and require a small amount of sample, can be employed. There is a growing interest in the use of HT techniques to speed up the testing and optimization of membrane-based separations. In this work, different HT screening approaches are developed and utilized for the evaluation and optimization of filtration performance using flat-sheet and hollow-fiber (HF) membranes used in biological and environmental separations. The effects of various process factors were evaluated on the separation of different biomolecules by combining a HT filtration method using flat-sheet UF membranes and design-of-experiments methods. Additionally, a novel HT platform was introduced for multi-modal (constant transmembrane pressure vs. constant flux) testing of flat-sheet membranes used in bio-separations. Furthermore, the first-ever HT modules for parallel testing of HF membranes were developed for rapid fouling tests as well as extended filtration evaluation experiments. The usefulness of the modules was demonstrated by evaluating the filtration performance of different foulants under various operating conditions as well as running surface modification experiments. The techniques described herein can be employed for rapid determination of the optimal combination of conditions that result in the best filtration performance for different membrane separation applications and thus eliminate the need to perform numerous conventional lab-scale tests. Overall, more than 250 filtration tests and 350 hydraulic permeability measurements were performed and analyzed using the HT platforms developed in this thesis.

Thesis

Doctor of Philosophy (PhD)

Membrane filtration is widely used as a key separation process in different industries. For example, microfiltration (MF) and ultrafiltration (UF) are used for sterilization and…

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

Subjects/Keywords: Membrane filtration; Ultrafiltration; Downstream bio-processing; High-throughput (HT) testing; Wastewater treatment; Hollow-fiber membranes; Humic acids; High-throughput filtration; Design-of-experiments (DOE); Process optimization; Microscale filtration; Microfluidic flow control system; Stirred well filtration; SWF; High-throughput hollow-fiber module; HT-HF; Constant TMP; Constant flux; Multi-modal filtration; Bioseparation; MMFC; Microscale parallel-structured, cross-flow filtration; MS-PS-CFF; PEG; Dextran; FITC-Dextran; BSA; DNA; IgG; α-lactalbumin; Biomolecule separation; Module hydrodynamics; Concentration polarization; Membrane fouling; Micromixing; Omega™ membrane; Microscale processing; Fouling test; PVDF membrane; Surface modification; Polydopamine; Membrane cleaning; Membrane backwashing; Sodium alginate; Polyethersulfone; PES; Hydraulic permeability; Membrane permeability; ZeeWeed® membrane; Filtration ionic strength; Filtration pH; Solution conditions; Water treatment; Environmental separations; Biological separations

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Kazemi, A. S. (2018). Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications. (Doctoral Dissertation). McMaster University. Retrieved from http://hdl.handle.net/11375/23404

Chicago Manual of Style (16th Edition):

Kazemi, Amir Sadegh. “Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications.” 2018. Doctoral Dissertation, McMaster University. Accessed February 28, 2021. http://hdl.handle.net/11375/23404.

MLA Handbook (7th Edition):

Kazemi, Amir Sadegh. “Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications.” 2018. Web. 28 Feb 2021.

Vancouver:

Kazemi AS. Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications. [Internet] [Doctoral dissertation]. McMaster University; 2018. [cited 2021 Feb 28]. Available from: http://hdl.handle.net/11375/23404.

Council of Science Editors:

Kazemi AS. Development of High-throughput Membrane Filtration Techniques for Biological and Environmental Applications. [Doctoral Dissertation]. McMaster University; 2018. Available from: http://hdl.handle.net/11375/23404

.