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Chlorination-Dechlorination and Toxicity Testing

The Chino Basin Municipal Water District (CBMWD), Calif., U.S.A., experienced problems with chlorine in the effluent of its regional No.1 water treatment plant. In order to comply with more stringent effluent limits for chlorine, CBMWD tested and retested its samples to determine if test variability...

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Bibliographic Details
Published in:Water environment & technology 1997-07, Vol.9 (7), p.49-52
Main Authors: Drury, Douglas D., Baker, Christopher A., Gundlach, John C., Ahmadpour, Jalal
Format: Magazinearticle
Language:English
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Summary:The Chino Basin Municipal Water District (CBMWD), Calif., U.S.A., experienced problems with chlorine in the effluent of its regional No.1 water treatment plant. In order to comply with more stringent effluent limits for chlorine, CBMWD tested and retested its samples to determine if test variability was the problem and performed a formal toxicity identification evaluation. Test variability accounted for approximately half of the chronic toxicity observed. The dechlorination process was modified to allow for more chemical reaction time and to provide more mixing. At CBMWD's regional plant No.2, effluent toxicity was caused by use of chemicals to control cockroaches. CBMWD is monitoring for both diazinon and chlorpyrifos levels in the collection system of Carbon canyon to determine the sources of pesticides in the effluent.
ISSN:1044-9493
1938-193X