Electrochemical CaCO3 scale removal with a bipolar membrane system

Irina Zaslavschi, Hilla Shemer, David Hasson*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

A recently developed electrochemical process for CaCO3 scale removal enables a major reduction in cathode area requirement. The basic concept of the improved system is separation of the anode and cathode compartments by a cationic ion exchange membrane and precipitation of the hardness in a separate crystallization vessel rather than by the conventional method of deposition on the cathode. This paper presents further improvements of the process by integration of bipolar membranes. Different arrangements of the membranes were explored (two cationic and one bipolar versus two bipolar and one cationic) with different flow schemes. Performance of the various configurations was characterized for hardness removal from both brackish and sea water feeds by measurement of current efficiencies, specific energy consumptions and specific precipitation rates. Results of this study indicate that integration of bipolar membranes enables significant improvement in current efficiencies and energy consumptions. Moreover, the integrated system enables complete prevention of the undesirable process of chlorine generation at the anode.

Original languageEnglish
Pages (from-to)88-95
Number of pages8
JournalJournal of Membrane Science
Volume445
DOIs
StatePublished - 15 Oct 2013
Externally publishedYes

Keywords

  • Bipolar membrane
  • Cathode area
  • Chlorine prevention
  • Electrochemical precipitation
  • Scale control

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