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Comparing Free Chlorine and Chloramines in Combination with UV for the Disinfection of Wastewater Effluents and Reclaimed Water

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Chlorine and UV are the most common disinfectants used by wastewater treatment plants, and combining them provides advantages such as better disinfection efficacy, improved reliability, and fewer disinfection byproducts. This work investigated UV combined with either free chlorine or chloramines in bench-scale laboratory experiments with fully nitrified filtered secondary effluent. Disinfection efficacy was monitored for poliovirus, MS2 coliphage (MS2), and total coliform. Combined UV/chloramines generally achieved disinfection benchmarks for poliovirus and total coliform; however, chloramines alone were not effective against MS2, and combined UV/chloramines yielded relatively poor disinfection of MS2. Combined UV/free chlorine achieved disinfection benchmarks for all microorganisms, and shows promise for pilotscale disinfection tests and full-scale application.

Keywords: MS2 coliphage; Multiple barrier disinfection; UV; chloramines; free chlorine; poliovirus; total coliform

Document Type: Research Article


Publication date: January 1, 2009

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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