Accurate determination of electrical potential on ion exchange membranes in reverse electrodialysis

Yuting Sun, Lianfa Song

Research output: Contribution to journalArticlepeer-review

Abstract

Reverse electrodialysis is a promising membrane technology to generate energy from con-trolled mixing of water streams of different salinities. Electrical potentials generate on the ion exchange membranes (IEMs) when selective transport of cations and anions across the membranes driven by concentration difference. The accurate determination of the potentials developed on the IEMs is critical to fairly assess the feasibility of the technology. The Nernst–Planck–Poisson (NPP) equations for IEMs (the membranes with fixed charge) were solved numerically with the boundary updating scheme. The validity of this numerical method was verified by the identical values of Don-nan potential obtained with the well-established analytical methods. The suitability and applicabil-ity of the classic Teorell–Meyer–Siever (TMS) model were assessed by comparison to the simulation results from the numerical method.

Original languageEnglish
Article number170
JournalSeparations
Volume8
Issue number10
DOIs
StatePublished - Oct 2021

Keywords

  • Boundary updating scheme
  • Ion exchange membrane
  • Membrane potential
  • Nernst-planck-poisson equations
  • Numerical solution
  • Reverse electrodialysis

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