PPC去除水源水中突发性重金属铜和锌污染研究

Removal of emergent contamination of Cu^(2+) and Zn^(2+) in source water by potassium permanganate composites

通过正交试验设计和单纯性优化试验设计模拟了地表水铜含量超标3倍、锌含量超标4倍的情况下,采用高锰酸盐复合药剂(PPC)强化去除这两种重金属的最优应急预案。结果表明,常规工艺对锌的去除率不到10%,对铜的最大去除率为30%;组合工艺去除铜的最优条件是:聚铝投加量为20 mg/L,PPC投加量为5 mg/L,pH值为9,PPC在混凝后1 min投加,此时铜的去除率在90%以上;组合工艺去除锌的最优条件是:聚铝投加量为20 mg/L,PPC投加量为4 mg/L,pH值为8,PPC在混凝前1 min投加,此时锌的去除率在90%以上。

The optimal emergency scheme of the enhanced removal of two kinds of heavy metals CuE＋ and Zn2＋ was designed and simulated by potassium permanganate composites （PPC） under the condition of excessive three times of Cu2＋ and four times of Zn2＋ in surface water through orthogonal experiment design and simplex optimization method. The results showed that the removal rate of conventional process on Zn2＋ was less than 10% , and the maximum removal rate on CuE＋ was 30%. The optimal condition of combined process on Cu2＋ removal was when the PAC dosage was 20 mg/L, PPC was added 1 min after coagulation with the dosage of 5 mg/L, pH was 9, and the removal rate of Cu2＋ was above 90%. The optimal condition of combined process on Zn2＋ removal was when the PAC dosage was 20 mg/L, PPC was added 1 min before coagulation with the dosage of 4 mg/L, pH was 8, and the removal rate of Zn2＋ was above 90%.