Alum과 PACl을 이용한 응집처리

Chemical Coagulation Treatment U sing Alum and PACI in Complex Wastewater

In order to treat the complεx wastewater containing organic compound and solids, prε treatment systεm associated with molecular sεparation process were investigated. The reductions of COD and turbidity were obtained after coagulation processes using Alum (Aluminium sulfate, AliS04)γ18H20) and PACI (poly aluminium chloride as 17% AI20 3). The results of study were as follows : using variablε dosage of Alum, COD removal was highest at 4,000 mg/l, and thε reduction of COD and turbidity was 42% and 92%, respectively. The optimum coagulation would bε effective at pH 7.3 than pH 9.0 by the addition of alum at a concentration of 6,000 mgll and PACI was add at 4.25% in raw complex wastewater with 2,000 mg/l alum at pH 7.3, the reduction of COD was reduced by 32%. But coagulation aid experiments indicated that PACI would be more effε， ctive in sludge separation ability than COD removal εfficiency.