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2992711 
Technical Report 
Degradation of O, O-dimethyl phosphorodithioate by activated sludge 
Kanagawa, T; Dazai, M; Tkakahara, Y 
1981 
HEEP/82/08454 
YATABE 
YATABE 
45-52 
HEEP COPYRIGHT: BIOL ABS. O,O-Dimethyl phosphorodithioate (DMDTP) is a precursor in the production of such organophosphorus pesticides as malathion, dimethoate, etc., and is abundant in waste-water of pesticide manufacturers. The activated sludge was acclimated to DMDTP by the fill-and-draw method. The acclimated, activated sludge degraded 500 mg/l DMDTP in 7 h and as a result produced 260 mg/l of Pi and 510 mg/l of sulfate. The pH of the mixed liquor was adjusted to degrade DMDTP and the optimum pH was from 6.5-7.0. The activated sludge acclimated to DMDTP degraded dimethyl phosphorothioate, dimethyl phosphate, diethyl phosphorodithioate and diethyl phosphate.