溶液中铬离子的电絮凝法分离研究

Study on the Separation of Chromium Ion from Solution by Electrocoagulation

采用Cr_(2)(SO_(4))_(3)为模拟含Cr废液,对电絮凝法的除Cr效果进行考察。恒压电絮凝实验结果表明,Al阳极比Fe阳极更适合电絮凝处理。Al阳极电絮凝法处理Cr_(2)(SO_(4))_(3)的优化实验条件为:电流密度350 A/m^(2),电解质质量浓度15g/L,初始p H值4.5,时间90 min。该方法的Cr去除率达到99.86%,Cr质量浓度降至3.39 mg/L。电流效率分析表明,Al阳极电絮凝法的电流效率较低,电流密度对电流效率的影响小。Al阳极电絮凝法对溶液中的Cr离子分离效果较好,为废水中Cr资源的回收利用提供了新的思路。

In this paper,Cr_(2)(SO_(4))_(3)was used as simulated Cr-containing waste water to investigate the removal effect of Cr by electrocoagulation.The results of constant voltage electrocoagulation experimentals show that Al anode is more suitable for electrocoagulation than Fe anode.The optimal conditions for the treatment of Cr_(2)(SO_(4))_(3)by Al anode electrocoagulation are as follows:current density 350 A/m^(2),electrolyte concentration 15 g/L,initial p H 4.5,and time 90 min.The Cr removal rate reached 99.86%and the Cr content was reduced to 3.39 mg/L.The current efficiency analysis shows that the current efficiency of Al anode electrocoagulation is low,and the current density has little influence on the current efficiency.The Al anode electrocoagulation method can achieve a good effect of Cr separation from solution,which provides a new idea for the recovery and utilization of Cr resources in Cr-containing waste water.