脉冲电絮凝处理电镀废水的工艺优化与应用

以实际电镀厂废水为研究对象,采用铁电极板电絮凝技术,考察比电流、溶液初始pH值、占空比和曝气强度等参数对废水中镍和铬去除效果的影响,并利用响应面法优化了电絮凝工艺。结果表明,当比电流为122 A/m^3、占空比为48%、初始p H值为7. 1、曝气强度为2. 4 L/L时,电解30 min后,对Ni²⁺、Cr⁶⁺和总铬的去除率分别为99. 65%、100%、100%,比能耗为0. 757kW·h/m^3,与传统的单因素试验相比,降低了11. 87%。实际工程废水的处理规模为30 m^3/h,400多天的运行效果表明,经响应面优化的电絮凝工艺运行稳定,出水水质达标。

Optimization and Application of Pulse Electrocoagulation Process for Electroplating Wastewater Treatment

The effect of specific current,initial pH,duty ratio and aeration intensity on nickel and chromium removal in real electroplating wastewater was investigated by using pulse electrocoagulation technology with iron plate as electrodes,and the response surface method was used to optimize the electrocoagulation process.When the specific current was 122 A/m3,duty ratio was 48%,initial pH was 7.1 and aeration intensity was 2.4 L/L,the removal rate of Ni2+,Cr6+and total chromium were 99.65%,100%and 100%respectively after electrolysis for 30 min,and specific energy consumption was 0.757 kW·h/m3,which was 11.87%lower than the traditional single factor test.The wastewater treatment scale of the process was 30 m3/h.According to more than 400 days of operation,the electrocoagulation process optimized by response surface method had been running stably,and the effluent quality had reached the standard.