混凝-电化学氧化处理垃圾渗滤液MBR出水的效能研究

Study on the Efficiency of Coagulation-Electrochemical Oxidation in the Treatment of MBR Effluent from Landfill Leachate

采用“混凝-电化学氧化”组合工艺对某垃圾填埋场中渗滤液MBR出水进行深度处理,探究了混凝工艺、电化学氧化过程中电极种类及运行参数对MBR出水中COD去除效果的影响,并讨论了混凝预处理在MBR出水电化学氧化过程中的重要意义。试验结果表明,“混凝-电化学氧化”组合工艺对垃圾渗滤液MBR出水中COD的降解效果显著。混凝预处理可去除MBR出水中68%以上的COD含量,同时可缓解电化学氧化的有机负荷,缩短电解时间,节约能耗,强化电化学氧化对水样中COD的降解效率,避免额外的深度降解工艺及成本投入,具有较好的经济环境效益。电化学氧化过程中,三种电极对该垃圾渗滤液MBR出水的处理能力大小为PbO_(2)>Ru系电极>Pt电极;采用Ti/PbO_(2)电极电解混凝处理后的MBR水样时,仅需在室温下进行,且当电流密度在50~70 A/m 2时,水样中COD的去除率可达96%以上,出水COD含量可降至10 mg/L左右,处理效果更佳。

The combined process of“coagulation-electrochemical oxidation”was used to carry out advanced treatment of the MBR effluent of leachate in a landfill,The effects of coagulation process,electrode types and operating parameters in the electrochemical oxidation process on the removal of COD in MBR effluent were explored,and the importance of coagulation pretreatment in the electrochemical oxidation of MBR effluent was discussed.The experimental results show that the combined process of“coagulation-electrochemical oxidation”has a significant effect on the degradation of COD in the MBR effluent of landfill leachate.Coagulation pretreatment can remove more than 68%of the COD content in the MBR effluent,at the same time it can alleviate the organic load of electrochemical oxidation,shorten the electrolysis time,save energy consumption,strengthen the degradation efficiency of COD in the water sample by electrochemical oxidation,and avoid additional The deep degradation process and cost input,and have better economic and environmental benefits.In the electrochemical oxidation process,the processing capacity of the three electrodes on the MBR effluent of the landfill leachate is PbO_(2)>Ru-based electrode>Pt electrode;When the MBR water sample after electrolysis and coagulation with Ti/PbO_(2) electrode is used,it only needs to be carried out at room temperature,and when the current density is 50~70 A/m 2,the removal rate of COD in the water sample can reach more than 96%,and the COD content of the effluent can be reduced to about 10 mg/L,and the treatment effect is better.