Selective separation of divalent ions from seawater using an integrated ion-exchange/nanofiltration approach

Samuel C.N. Tang, Liat Birnhack, Yehuda Cohen, Ori Lahav*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A new concept is introduced for separating and concentrating (predominantly) Mg2+ and SO42− from seawater, along with low monovalent ion concentrations. Seawater is first subjected to cationic ion exchange aimed at balancing the equivalent concentration ratio between divalent cations and anions. This step's effluent undergoes nanofiltration, and the MgSO4-rich retentate of the nanofiltration step undergoes further semi-batch diananofiltration for reducing the monovalent ion concentrations. Regeneration of the ion exchange resin is carried-out by permeate attained from nanofiltrating SWRO desalination retentate. The paper presents detailed results from all process steps followed by cost-analysis amounting to ∼$1.6 kg−1 of separated Mg2+.

Original languageEnglish
Pages (from-to)8-15
Number of pages8
JournalChemical Engineering and Processing: Process Intensification
Volume126
DOIs
StatePublished - Apr 2018

Keywords

  • Desalinated water
  • Ion exchange
  • Mg
  • Nanofiltration
  • Post treatment

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