On the drying out of bipolar membranes

Ora Kedem, Andrea Ghermandi, Rami Messalem

Research output: Contribution to journalArticlepeer-review


The maximum current density that can be achieved in bipolar membrane electrodialysis is limited by the sharp increase in resistance that is experienced when the water content at the membrane interface is not adequately replenished and the membranes dry out. In this paper we show how the water content near the interface depends on the properties of the membranes. A water retaining parameter is introduced, which characterizes the thermodynamic properties of the membrane material and may be used to guide the choice of polymers for mitigation of the dry-out problem.

Original languageEnglish
Pages (from-to)215-222
Number of pages8
JournalMembrane Water Treatment
Issue number3
StatePublished - 2013


  • Bipolar membrane
  • Current-voltage curve
  • Dry-out
  • Electro-osmosis
  • Water absorption

ASJC Scopus subject areas

  • General Chemical Engineering
  • Water Science and Technology


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