Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks
KAUST Grant NumberKUS-I1-003-13
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AbstractMembrane ionic resistance is usually measured by immersing the membrane in a salt solution at a single, fixed concentration. While salt concentration is known to affect membrane resistance when the same concentration is used on both sides of the membrane, little is known about membrane resistance when the membrane is placed between solutions of different concentrations, such as in a reverse electrodialysis (RED) stack. Ionic resistance measurements obtained using Selemion CMV and AMV that separated sodium chloride and ammonium bicarbonate solutions of different concentrations were greater than those measured using only the high-concentration solution. Measured RED stack resistances showed good agreement with resistances calculated using an equivalent series resistance model, where the membranes accounted for 46% of the total stack resistance. The high area resistance of the membranes separating different salt concentration solutions has implications for modeling and optimizing membranes used in RED systems.
CitationGeise GM, Curtis AJ, Hatzell MC, Hickner MA, Logan BE (2014) Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks. Environ Sci Technol Lett 1: 36–39. Available: http://dx.doi.org/10.1021/ez4000719.
SponsorsThis research was supported by funding through the King Abdullah University of Science and Technology (KAUST) (Award KUS-I1-003-13) and the U.S. National Science Foundation (NSF) Research Experience for Undergraduates (REU) program (NSF Grant DMR 1156960).
PublisherAmerican Chemical Society (ACS)