电镀含镍废液处理技术探讨

Discussion on Treatment Technology of Electroplating Waste Liquid Containing Nickel

采用H2O2/Fe2+构成的氧化体系对含重金属络合废水进行氧化破络后,再采用常规的物理化学处理方法进行处理,达到将络合物重金属离子去除及降低COD的目的。实验分析了影响芬顿体系破络反应的各种因素:H2O2添加量、FeSO4添加量、反应pH、反应时间、反应温度,最后总结出该反应的最佳条件:H2O2添加量为5%,FeSO4添加量7.5%,初始pH = 3.0,反应时间3 h,反应温度25℃。实验中的电镀含镍废液是源于某线路板厂家电镀镍车间所排放的含镍氨络合的废水。

The complex wastewater was oxidized and broken by H2O2/Fe2+ oxidation system, and then treated by conventional physicochemical treatment methods, to achieve the purpose of removing heavy metal ions of complex and reducing COD. Various factors affecting the reaction of Fenton system were analyzed, including the amount of H2O2, the amount of FeSO4, the reaction pH, the reaction time and the reaction temperature. Finally, the optimal reaction conditions were summarized: The addition amount of H2O2 is 5%, the addition amount of FeSO4 is 7.5%, the initial pH is 3.0, the reac-tion time is 3 h, and the reaction temperature is 25˚C. The electroplating nickel-containing waste liquid in the experiment was derived from nickel-containing ammonia complex wastewater dis-charged from the electroplating nickel workshop of a circuit board manufacturer.