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Identification of Low Potential Onset of Concentration Polarization and Concentration Polarization Mitigation in Water Desalination Membranes

Bellman, Karen L.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1325109865

Abstract Details

2012, Master of Science, Ohio State University, Mechanical Engineering.
Identification of concentration polarization regimes in nanocapillary array membranes for electrokinetically driven flow was investigated in a parametric study varying both nominal pore diameter (10, 50, 100 nm) and potassium phosphate buffer solution concentration (0.2, 1, 10 mM) used as the background electrolyte. The applied voltage for the electrokinetic flow was kept below 1 V (tested range from 10-750 mV) and was chosen to conduct experiments in a regime where minimal Faradaic or charge transfer reactions occur for transport across nanopores. Methylene blue at a concentration of 0.14 mM was used as a tracking dye to indicate the transport of charged carriers in the presence of these relatively low applied potentials. An electrical circuit model of the nanopore and the surrounding solution was developed. For an electrokinetic radius of 3.56 or less, the concentration time gradient of dye indicates onset of concentration polarization regimes. Mitigation of polarization was performed with commercial forward osmosis (FO) membranes in permeation cells using a new electrical mitigation method that has been developed as part of this work. Initial proof-of-concept experiments show that for the membranes tested, a flux enhancement of over 40% was achieved.
Shaurya Prakash, PhD (Advisor)
Sandip Mazumder, PhD (Committee Member)
91 p.
Energy; Engineering; Environmental Engineering; Mechanical Engineering
concentration polarization mitigation; membrane flux enhancement; water purification; electrokinetic flow; nanocapillary array membrane

Recommended Citations

Citations

  • Bellman, K. L. (2012). Identification of Low Potential Onset of Concentration Polarization and Concentration Polarization Mitigation in Water Desalination Membranes [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325109865

    APA Style (7th edition)

  • Bellman, Karen. Identification of Low Potential Onset of Concentration Polarization and Concentration Polarization Mitigation in Water Desalination Membranes. 2012. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1325109865.

    MLA Style (8th edition)

  • Bellman, Karen. "Identification of Low Potential Onset of Concentration Polarization and Concentration Polarization Mitigation in Water Desalination Membranes." Master's thesis, Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325109865

    Chicago Manual of Style (17th edition)

osu1325109865
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© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.