Seasonal UV disinfection of treated urban effluent. 2. Virological findings

Nurliza Buyong Food Research Institute, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.

Dean O. Ch'ver Food Research Institute, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.; W.H.O. Collaborating Centre on Food Virology, Department of Bacteriology, and Department of Animal Health and Biomedical Science, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.

Amy B. Ronner Food Research Institute, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.

Kenneth D. Kostenbader Food Research Institute, University of Wisconsin, Madison, Wisconsin, 53706, U.S.A.

Abstract

“Seasonal disinfection” means that, if the receiving waterway is not also a source of drinking water, urban wastewater—treated to the secondary level‐may not be disinfected before discharge when weather is cold enough to discourage swimming. Swimmers occasionally get waterborne virus infections. RNA coliphages (RNA‐containing viruses that specifically infect Escherichia coli cells that have an F pilus) may serve better than bacterial indicators to suggest the presence of human viruses in water. Coliphages and enteroviruses were studied in an urban treatment plant and its receiving waterway. Removal of coliphages by wastewater treatment was estimated at 1.5 log units (ca. 97%), whereas UV disinfection evidently inactivated another 1 to 1.5 log units (total 99 to 99.9%). Virologic effects of seasonal disinfection differed substantially from those observed by bacteriological testing.

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Seasonal UV disinfection of treated urban effluent. 2. Virological findings

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Seasonal UV disinfection of treated urban effluent. 2. Virological findings

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