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根据密云水库供水现状,针对突发性无机金属污染事件,采用聚合氯化铝辅助化学沉淀法进行应急处理。选用Cu2+、Fe2+、Zn2+和Cd2+4种金属离子为目标污染物,首先通过小试实验确立了最佳混凝处理条件。结果表明,调节pH值为8.0左右,可使初始浓度为5 mg/L和10 mg/L的Cu2+浓度降至0.96 mg/L和0.67 mg/L;初始浓度为1.5 mg/L和3 mg/L的Fe2+浓度降至0.27 mg/L和0.24 mg/L;初始浓度为0.05 mg/L和0.1 mg/L的Cd2+浓度降为0.0089 mg/L和0.0078 mg/L;调节pH值为9.0时,可使初始浓度为5 mg/L和10 mg/L的Zn2+浓度降至0.57 mg/L和0.48 mg/L。4种污染物出水浓度均低于国家饮用水标准。在小试基础上,在北京第九水厂开展无机金属污染处理的中试实验,结果表明所选用的聚合氯化铝辅助化学沉淀法简便易行,可实现污染物快速、有效去除。
According to the current situation of water supply in Miyun Reservoir, aiming at the incident of unexpected inorganic metal pollution, polyaluminum chloride-assisted chemical precipitation was used for emergency treatment. Cu2 +, Fe2 +, Zn2 + and Cd2 + were selected as the target pollutants. The optimal coagulation conditions were established through a pilot test. The results showed that the Cu2 + concentrations of 5 mg / L and 10 mg / L were reduced to 0.96 mg / L and 0.67 mg / L respectively when the pH was adjusted to about 8.0. The initial concentration of Cu2 + was 1.5 mg / L and 3 mg / L, the concentration of Fe2 + was reduced to 0.27 mg / L and 0.24 mg / L respectively; the concentration of Cd2 + was reduced to 0.0089 mg / L and 0.0078 mg / L with initial concentrations of 0.05 mg / L and 0.1 mg / L; Zn2 + concentrations of 5 mg / L and 10 mg / L were reduced to 0.57 mg / L and 0.48 mg / L, respectively. The effluent concentrations of the four pollutants are lower than the national drinking water standards. On the basis of a small test, a pilot plant experiment of inorganic metal pollution treatment was carried out at No.9 Watertown in Beijing. The results show that the selected PAC-assisted chemical precipitation method is simple and easy to implement and can remove contaminants rapidly and effectively.