氯离子在电化学氧化处理垃圾渗滤液中的转化研究

Study on the Conversion of Chloride Ion in Electrochemical Oxidation Treatment for Dump Percolate

以氯离子含量较高的循环式准好氧垃圾渗滤液为研究对象,初步探讨了阳极材料对电化学氧化处理过程中氯离子转化效果的影响,通过正交实验对氯离子在电解处理过程中形态转化的量进行了初步分析.研究结果表明,不同的阳极材料分别在同一条件下电解处理垃圾渗滤液时,溶液中均生成了一定量的余氯,阳极材料不同,溶液中的余氯和逸出的C l2量也不同,Ru-Ir/Ti电极作阳极电解处理有利于渗滤液中C l-的氧化;渗滤液中的C l-在电解处理过程中的主要存在形态为C l-、余氯和C l2,在实验所用的电解条件下,平均有85.8%的氯以C l-形式和余氯形式留在电解液中,平均有3.95%的氯以C l2形式从渗滤液中逸出,若在不利的条件下电解,会使氯气逸出的比例增加到23.1%.在电解处理过程中,为避免产生的氯气造成二次污染,不能任意提高渗滤液中C l-的初始浓度.

The cyclical semi-aerobic dump percolate with high chloride content is studied in this paper. The influence of anode materials on the chloride ion conversion during the electrolytic treatment is discussed. The factors that affect the conversion of chloride ion morphology in the course of electrolytic treatment by orthogonal experiment are also discussed. It shows that when different anode material are used to electrolyze the dump percolate in the identical condition, some residual chlorine are produc.ed in the solution. The content of residual chlorine and Cl2 are different if the anode materials are different. Using Ru-Ir/Ti anode is benefical to the oxidation of Cl^- in the electrolytic process, in the electrolytic test condition, the main morphology of chloride ion is mainly Cl^- , residual chlorine and Cl^- , the average content of Cl^- morphology and residnal chlorine morphology is 85.8% and the average content of Cl^- escaping from the percolate is 3.95%. If the electrolysis is carried out under the disadvantageous condition, the content of Cl2 escaping can increase to 23.1%. The chloride ion concentration can not be increased at will during the electrolysis in order to avoid the second pollution of produced chlorine gas.