为了探讨电絮凝法对钢铁厂镀镉废水的处理效果,先对铝铁电极活化预处理后,采用电絮凝法原理对镀镉废水中的镉离子去除净化。系统地分析了铝电极的极化效应,对影响絮凝体的平均粒径、含量、镉离子去除率的因素进行探讨。结果表明：最佳电解时间为70 min,此时絮凝体平均粒径为54 μm,含量为3.80 g/L。铝铁电极的阳极极化效应强于阴极极化效应。当起始pH=4.0、极板间距为20 mm、极板电压为5 V、电流密度为30 mA/cm²时,Cd²⁺初级去除率达到96.8%,三级去除率超过99.9%,废水中Cd²⁺含量达到国家现行电镀污染物排放标准。采用电絮凝法通过铝铁电极处理镀镉废水的实验效果优良。

In order to investigate the effect of electrocoagulation on the treatment of cadmium plating wastewater from iron and steel plant,the aluminum iron electrode was activated and pretreated,and then the principle of electrocoagulation was used to remove and purify cadmium ions in the wastewater.The polarization effect of aluminum electrode was systematically analyzed,and the factors affecting the average particle size,content and removal rate of cadmium ion were discussed.The results showed that the optimal electrolysis time was 70 min,and the average particle size of flocs was 54 μm and the content was 3.80 g/L.The anodic polarization effect of Al Fe electrode was stronger than the cathodic polarization effect.When the initial pH value was 4.0,the plate spacing was 20 mm,the plate voltage was 5 V,and the current density was 30 mA/cm²,the primary removal rate of Cd²⁺ reached 96.8%,and the tertiary removal rate exceeded 99.9%.The content of Cd²⁺ in wastewater reached the current national discharge standard of electroplating pollutants.The experimental results showed that the electrocoagulation method was effective in the treatment of cadmium plating wastewater by aluminum iron electrode.