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Combining UV and Free Chlorine in Pilot-Scale Experiments: Disinfection Efficacy, Byproducts, and Microconstituents

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Chlorine and UV are the most common disinfectants used for wastewater treatment, and combining them may provide advantages such as better disinfection efficacy, improved reliability, and fewer disinfection byproducts. Previous bench-scale experiments showed that free chlorine and UV provided effective disinfection of MS2 coliphage, poliovirus, adenovirus, and total coliform. This study continued that work by investigating combined UV/free chlorine in a continuous-flow pilot system. Results confirmed effective disinfection of MS2 coliphage and total coliform. The combined disinfection scheme also maintained trihalomethanes, cyanide, and N-nitrosodimethylamine at acceptable levels, and decreased concentrations of some pharmaceuticals and other microconstituents. Overall, these results confirm the benefits of using multiple disinfectants and indicate that combined UV/free chlorine is a promising disinfection technology for disinfection of wastewater effluents and recycled water.

Keywords: MS2 coliphage; Multiple barrier disinfection; UV; adenovirus; disinfection byproducts; free chlorine; microconstituents; pharmaceuticals; pilot experiments; total coliform

Document Type: Research Article


Publication date: 2009-01-01

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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 These proceedings are not peer reviewed.

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