三维电极电解处理含镍废水的研究

Study on Electrolytic Treatment of Wastewater Containing Nickel by Three-Dimensional

采用单极性三维电极电解法处理低浓度含镍废水及回收金属镍,对比研究了三维电极与二维电极的去除镍离子效果,同时探究了电流强度、填充材料、填充比、pH值及极板间距对镍离子的去除规律,并建立了反应动力学模型。结果表明:三维电极的镍离子去除率远高于二维电极;在阳极为网状Ti/IrRu、阴极为不锈钢,第三极为空心钢球,电流为0.8 A,极板间距为10 cm、电解时间为2 h、填充比为2.8、废水pH值为5的条件下处理镍离子质量浓度为124.5 mg/L的废水,镍离子去除率可达93.3%、电流效率为56.8%,镍去除反应符合一级反应动力学模型。

The unipolar three-dimensional electrode electrolysis method was used to treat low-concentration nickel-containing wastewater to recover metal nickel.The effects of three-dimensional electrodes were compared with the two-dimensional electrode on nickel ion removal,and the factors affecting the nickel ion removal were studied.The reaction kinetic model was established.The experimental results show that:The nickel ion removal rate of the three-dimensional electrode is much higher than that of the two-dimensional electrode;Under the conditions of using reticular Ti/RuO2 as anode,stainless steel plate as cathode,hollow steel ball as the third electrode,electric current 0.8 A,inter-electrode distance 10 cm,electrolysis time 2h,mass ratio of hollow steel ball to wastewater 2.8,and wastewater pH=5,the wastewater with 124.5 mg/L of nickel ion mass concentration was treated with 93.3%ofnickel ion removal rate and 56.8%of current efficiency;The nickel removal reaction accorded with the first-order reaction kinetic model.