强化混凝沉淀法处理铅锌矿尾矿废水中铅离子的研究

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

采用“螯合＋混凝＋沉淀”工艺处理铅锌矿尾矿废水,以出水含铅量为考察指标,讨论了混凝剂的种类、投加量、强化剂的添加及其投加量等因素对强化混凝实验的影响。获得强化混凝实验的最佳工艺条件：尿素投加量为0.5～1mg/L,聚合硫酸铝（PAS）的投加量为2～3mg/L。该工艺可有效去除铅锌矿尾矿废水中的重金属铅,使其达到排放标准,且工艺简单,费用低廉,可推广使用。

The method of ＂chelation＋ coagulation-}-sedimentation＂ was used in the treatment of lead- zinc 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.