||Treatment technology for pesticide manufacturing effluents: bentazon /
Handy, Robert W., ;
Smith, D. J. ;
Green, D. A.
||Research Triangle Inst., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Pesticides--Environmental aspects ;
Factory and trade waste ;
High performance liquid chromatography ;
Water pollution control ;
Chemical industry ;
Industrial waste treatment ;
Operating costs ;
Cost analysis ;
Oxygen organic compounds ;
Water pollution detection ;
Benzothiadiazinone dioxide/isopropyl ;
High performance liquid chromatography
||Some EPA libraries have a fiche copy filed under the call number shown.
||51 pages : illustrations
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.
Caption title. "March 1985." "EPA/600/2-85/015." Microfiche.