Research on the treatment of lead ion in lead-zinc tailing wastewater by enhanced coagulation and sedimentation

The method of"chelation+coagulation+sedimentation"was used in the treatment of leadzinc tailing wastewater in this paper.Regarding lead content as index,the effects of coagulant type,dosage,strengthener's aid and its dosage of enhanced coagulation experiment were investigated.The best conditions of enhanced coagulation process were that:the dosages of carbamide and polymeric aluminum sulfate(PAS)were 0.5～1mg/L and 2.0～3.0mg/L,respectively.This process can remove lead of the lead-zinc tailing effluent efficiently,achieving the requested discharge standards.Moreover,the process which is simple process and low operation cost,can be used widely.