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Testing the equivalency of ultraviolet light and chlorine for disinfection of wastewater to reclamation standards

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Abstract:

Full-scale ultraviolet (UV) light and chlorine disinfection systems were operated in parallel using nitrified and partially denitrified tertiary treated wastewater effluent. A UV dose of 75 mW · s/cm2 reduced the concentration of fecal coliforms, enterococci, fecal streptococci, MS2 bacteriophage, and poliovirus by four logs. A higher dose was needed to reduce the concentration of heterotrophic plate count (HPC) by four logs and to achieve a total coliform value ≤2.2 MPN per 100 mL within a consecutive 7-day period as required by the most restrictive California Wastewater Reclamation Criteria (CWRC). The cleaning frequency needed to maintain a minimum operational UV dose was assessed by constructing a lamp fouling curve describing reduction in UV intensity as a function of elapsed time since lamp cleaning. Substitution of UV light for chlorine disinfection eliminated formation of trihalomethanes, reduced formation of aldehydes, and formed a mid-polarity unidentified peak at a bench-scale dose of 2 800 mW·s/cm2 The unidentified UV peak was not detected at a full-scale dose of 188 mW·s/cm2. No chronic toxicity was observed for the full-scale UV irradiated effluent; a decline in the reproductive rate of Ceriodaphnia dubia was observed for the full-scale chlorinated effluent.

Keywords: BYPRODUCTS; CHLORINE; DISINFECTION; RECLAMATION; TOXICITY; ULTRAVIOLET

Document Type: Research Article

DOI: https://doi.org/10.2175/106143097X125137

Publication date: 1997-01-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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