Impact of halogen based disinfectants in seawater on polyamide RO membranes

Hilla Shemer; Raphael Semiat

doi:10.1016/j.desal.2010.05.056

Impact of halogen based disinfectants in seawater on polyamide RO membranes

Hilla Shemer^*, Raphael Semiat

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	179-183
Number of pages	5
Journal	Desalination
Volume	273
Issue number	1
DOIs	https://doi.org/10.1016/j.desal.2010.05.056
State	Published - 1 Jun 2011
Externally published	Yes

Keywords

Bromine
Chloramines
Chlorination
Degradation
Oxidation
Reverse osmosis

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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.",

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author = "Hilla Shemer and Raphael Semiat",

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AU - Semiat, Raphael

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