Impact of halogen based disinfectants in seawater on polyamide RO membranes

Hilla Shemer*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The effect of halogen based disinfectants including monochloramines (NH2Cl), free chlorine (HOCl/OCl-), and free oxidants (mixture of HOCl/OCl- and HOBr/OBr) on polyamide membrane was studied in synthetic Ocean seawater. Formation and stability of these oxidants were also examined. Permeability and salt rejection of flat sheet polyamide RO membranes following exposure to the halogen based oxidants were compared to the baseline performance of unexposed membranes. The ratio between free chlorine and free bromine was found to depend on the ratio between the bromides, naturally found in seawater, and the added chlorine. Bromide enhanced the degradation of monochloramines but did not affect the stability of free chlorine. All the oxidants damaged the polyamide membranes studied while the free oxidants appeared to be the most aggressive.

Original languageEnglish
Pages (from-to)179-183
Number of pages5
JournalDesalination
Volume273
Issue number1
DOIs
StatePublished - 1 Jun 2011
Externally publishedYes

Keywords

  • Bromine
  • Chloramines
  • Chlorination
  • Degradation
  • Oxidation
  • Reverse osmosis

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