Electrodialysis with brine solutions oversaturated with calcium sulfate

E. Korngold, L. Aronov, N. Belayev, K. Kock

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


Electrodialysis (ED) was applied to concentrate brine solutions of various concentrations - similar to effluentsfrom the desalination of brackish and industrial water - to about 20%. The consequent reduction in effluent volumes would facilitate a reduction in disposal costs. The energy requirement for concentrating solutions from 70 to 300 mN (0.4-1.8%) to 3.9 N (20%) was in the range 1.5-7.1 kWh/m3, in contrast to approximately 25 kWh/m3 by thermal evaporation. With the aim of preventing precipitation of CaSO4 on the membranes, laboratory-scale ED experiments were carried out on solutions of different compositions to determine the conditions that would lead to the precipitation of excess gypsum on gypsum seeds in a separate precipitator. The results were then applied in a pilot-scale ED unit in which the brine that circulated through the ED brine cells passed through a separate CaSO4 precipitator containing gypsum seeds.

Original languageEnglish
Pages (from-to)63-75
Number of pages13
Issue number1
StatePublished - 1 Feb 2005


  • Brine concentration
  • Calcium sulfate seeding
  • Electrodialysis

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Materials Science (all)
  • Water Science and Technology
  • Mechanical Engineering


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