Salt Concentration Differences Alter Membrane Resistance in Reverse Electrodialysis Stacks

Geoffrey M. Geise, Andrew J. Curtis, Marta C. Hatzell, Michael A. Hickner, Bruce E. Logan

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Membrane 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.

Original languageEnglish (US)
Pages (from-to)36-39
Number of pages4
JournalEnvironmental Science and Technology Letters
Volume1
Issue number1
DOIs
StatePublished - Oct 7 2013

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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