摘要
垃圾渗滤液是一种成分复杂、毒性较强且难处理的废水之一。实验采用混凝沉淀-厌氧-电解-好氧一体化组合工艺处理垃圾渗滤液,探索了混凝沉淀池和电解池的运行参数对垃圾渗滤液处理效果的影响,并分析了组合工艺对于6种重金属（Cu、Zn、Cd、Cr和Ni）的去除效果。实验结果表明,以PAC为混凝剂PAM为助凝剂时,投加量分别为1.2 g/L和1mg/L,COD去除率可达57%。电化学工艺阶段,在p H为6.0,电流密度15 m A/cm^2,Cl-浓度2 200-2 400 mg/L,电解2.5h,垃圾渗滤液的COD去除率达55.4%。一体化电生物滤池对于重金属的去除具有明显的效果,Cu、Cd和Zn去除率达100%,Ni去除率超过90%,Cr去除率超过80%,COD整体去除率达94%;NH＋4-N去除率达97.2%;TN去除率达73.6%。混凝沉淀-厌氧-电化学-好氧的组合工艺来处理垃圾渗滤液,能够有效地去除水体中的重金属及COD、NH＋4-N。
Leachate is a complex mixture of toxic wastewater and hard to be treated. A combined process of coagulation-anaerobic-electrolysis-aerobic was employed to treat the landfill leachate. Of the variables studied,the influences of operation parameter of coagulation reactor and electrolysis coagulation reactor on treatment performance were investigated. In the meanwhile,some of heavy metals（ Cu,Zn,Cd,Cr,Ni） were used as internal check on the removal efficiency for the integrated process. The results indicated that removal efficiency of COD was 57% in separate coagulation process with 1. 2 g / L PAC and 1mg / L PAM. The separate electrochemical process removed 55. 4% of COD after three hours electrolysis with certain conditions（ p H of 6. 0,current density of 15 m A / cm^2,Cl-concentration of 2 200—2 400 mg / L）. In addition,integrated process enables COD,NH＋4-N and TN removal rate reached 94%,97. 2% and 73. 6%,respectively. The removal rates of heavy metals also indicated optimistic results with integrated process simultaneously. Cu,Cd and Zn were completely removed and the removal rates of Ni and Cr exceeded 90%,80% respectively. The experiments demonstrated that the integrated process applied in the study can effectively remove COD,NH＋4-N and heavy metals.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第2期593-598,共6页
Chinese Journal of Environmental Engineering
基金
国家重大科学仪器设备开发专项(2012YQ15008705)
嘉兴市科技计划项目(2013AY21031)
关键词
垃圾渗滤液
电解
生物滤池
好氧
厌氧
landfill leachate
electrolysis
biological aerated filter
aerobic
anaerobic
