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Modeling the fate of pesticides in municipal wastewater treatment

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Abstract:

The fate of two insecticides (lindane and diazinon) and three herbicides (2,4-D, 2,4,5-T, and atrazine) in municipal wastewater was investigated in pilot plant experiments. The pesticides were dosed into the wastewater to provide feed concentrations in the 2 to 10 μg/L range. The pilot plant was operated at both 4- and 10-day solids retention times (SRTs) in the first of two testing campaigns and at a 4-day SRT in the second campaign. Only lindane was found to be biodegradable to any extent. Loss of pesticides from the system due to sorption to mixed liquor solids was small. Estimated partition coefficients ranged from 0.01 to 2 L/g volatile suspended solids (VSS), whereas biodegradation rates ranged from 0.1 for lindane to 4 E-6 L/g VSS · h for 2,4,5-T. Because the pesticides examined are mostly refractory to activated sludge treatment under the conditions examined, it is desirable to limit their entry to wastewater collection and treatment systems to minimize their impact on receiving waters.

Keywords: ACTIVATED SLUDGE; BIODEGRADATION; FATE; MODEL; PESTICIDE; SORPTION

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143095X133194

Publication date: September 1, 1995

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  • 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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