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TREATMENT TECHNOLOGY FOR PESTICIDE MANUFACTURING EFFLUENTS: BENTAZON
Citation:
Handy, R., D. Smith, AND D. Green. TREATMENT TECHNOLOGY FOR PESTICIDE MANUFACTURING EFFLUENTS: BENTAZON. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-85/015 (NTIS PB85176816), 1985.
Description:
The report gives results of laboratory studies of the treatability of wastewater generated from the manufacture of bentazon. The wastewater was characterized for pesticide content by high performance liquid chromatography (HPLC). Toxicity determinations on bentazon and its major treatment product (dichlorobentazon) were conducted with Daphnia Magna. Bentazon was not toxic to the daphnids at concentrations of up to 50 ppm. The major known by-product of chlorination of bentazon is dichlorobentazon, which is toxic to daphnids at 50 ppm. The removal of bentazon from wastewater by treatment with sodium hypochlorite was emphasized. The effects of variations in the pH, amount of hypochlorite, temperature, and mode of hypochlorite addition were studied. Temperature and the mode of addition had little effect on the removal of bentazon. It was found that bentazon is most efficiently removed by hypochlorite when the pH is 2 or below and when a 245- to 370-fold excess of hypochlorite is used. Based on assumed rates of process wastewater production, the total cost of the treatment was estimated.