两步混凝法去除电镀废水中的铜和镍

Copper and Nickel Removal from Electroplating Wastewater Using Two-Step Coagulation Method

利用两步混凝法对某电镀废水中的Cu2+和Ni 2+进行去除,并对混凝剂的类型、混凝剂和助凝剂投加量、废水pH等工艺参数进行了优化,该方法可作为该电镀废水的处理方法.结果显示,当溶液pH值为11.0、混凝剂聚合氯化铝铁的投加量为1.0g/L、助凝剂聚丙烯酰胺投加量为0.2g/L时,电镀废水具有最好的处理效果,处理后废水中Cu2+和Ni 2+的质量浓度分别为0.13mg/L和0.06mg/L.同时,处理成本可降至1.9元/m3.

A two-step coagulation method is used to remove Cu2＋ and Ni2＋ from an electroplating wastewater. The experimental parameters including coagulant type, dosage of coagulant and coagulant aids, wastewater pH are optimized. The results show that when wastewater pH value, dosage of coagulant polyaluminum ferric chloride and dosage of coagulant aids polyacrylamide are 11.0, 1.0 g/L and 0.2 g/L respectively, the electroplating wastewater has the best removal efficiency. Under the optimization experimental conditions, the Cu2＋ and Ni2＋ concentrations are 0.13 mg/L and 0.06 mg/L respectively. Meanwhile, the treatment cost can be reduced to 1. 9 RMB/m3; therefore, the method is a feasible technique for treating the electroplating wastewater.