膜电解法处理含镍废水的技术经济性能研究

Technologic Economy Performance Study on Membrane Electrolysis in Treatment of Nickel-containing Wastewater

采用单阴膜电解法对含镍废水进行处理，在理论分析的基础上研究了电解液pH值、Ni^2＋浓度、电流强度等影响因素。实验结果表明，对于pH值为0．5-1．0、Ni^2＋的平均质量浓度为1400mg／L的含镍废水，在电解电流150mA、电压5V的条件下，控制电解时间为20-24h，调节电解液初始pH值为4，采用离子交换法将Ni^2＋富集到14000mg／L时，平均电流效率可达到90．7％，镍的平均去除率为88．7％，可比普通电化学法电流效率提高30％，节能50％以上。

In this paper, the monoanionic membrane electrolysis method was used to deal with the nickelcontaining wastewater. On the basis of theoretical analysis, the.infective factors such as the pH value of electrolyte, the nickel ion consistency, electric current intensity were studied. The experiment result showed that when the pH value of the nickel-containing wastewater was 0.5-1.0, the average nickel ion consistency was 1 400 mg/L, the electric current was 150 mA, the voltage was 5 V, the electrolysis time was controlled between 20-24 h, the initial pH value of electrolyte was adjusted to 4, the nickel ion consistency was enriched to 14 000 mg/L by ion exchange method, the monoanionic membrane method＇s average current efficiency could reach 90.7% and average elimination rate of nickel was 88.7 %. It＇ s current efficiency was 30 % higher than general electrochemical method and it could save more than 50% energy.