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AWWA MTC69778
- Chlorine Resistant Membrane and the Mechanism of Membrane Degradation by Chlorine
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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Polyamide reverse osmosis membranes, used successfully for water desalination, are made fromthe interfacial reaction of meta-phenylenediamine (MPD) with trimesoyl chloride. Oneproblem with the membrane is that its performance is deteriorated upon prolonged exposureto chlorine often used for disinfecting feedwater. ATR-FTIR and XPS analysis show chlorinereacts with the amide hydrogen and is attached to the polyamide membrane. A chlorineresistant membrane has been made using a non-MPD amine and appears to be five times aschlorine-resistant as the MPD-based membrane. ATR-FTIR and XPS analysis also show thechlorine-resistant membrane picks up chlorine much less than the MPD-based membraneupon exposure to chlorine. Monochloramine does not appear to adversely affect polyamidemembranes. Includes 10 references, table, figures.
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