电氧化光芬顿组合工艺处理垃圾渗滤液膜浓缩液研究

Treatment of landfill leachate membrane concentrate by electrochemical oxidation and UV-Fenton combination processes

“预处理+生化法+膜处理”的组合工艺是常用的垃圾渗滤液处理工艺,虽然能够快速稳定地削减渗滤液中各类污染物,但产生的渗滤液膜滤浓缩液富集了更高浓度的难降解有机物、盐分和其他无机物,难降解有机物的去除是渗滤液浓缩液处理的难题。以深圳某填埋场垃圾渗滤液膜浓缩液为研究对象,分别研究了三维电氧化、紫外芬顿(UV/Fenton)以及三维电氧化-UV/Fenton-电催化氧化组合工艺对垃圾渗滤液膜浓缩液的处理效果。在实验操作条件下,电氧化2 h,UV-Fenton处理1.5 h,电催化氧化2 h,COD、氨氮、总氮的去除率分别为97.6%、98.8%和93.5%,出水基本满足《生活垃圾填埋场污染控制标准》(GB 16889—2008)直接排放限值要求,每吨垃圾渗滤液膜浓缩液的处理成本为93.2元。

The combination of pretreatment,biochemical method and membrane treatment is the mainstream process of domestic landfill leachate treatment.Although it can quickly and stably reduce various pollutants in the leachate,the produced leachate membrane concentrate contains high concentrations of refractory organics,salts and other inorganics.The removal of refractory organic matter is a problem for the treatment of leachate concentrate.The landfill leachate membrane concentrate from a landfill sitein Shenzhen was treated bythree-dimensional electrochemical oxidation,UV-Fenton and electrochemical oxidation-UV/Fenton-electrocatalytic oxidation combination process.The removal efficiency of COD,ammonia nitrogen,and total nitrogen were 97.6%,98.8%,and 93.5%followingelectrochemical oxidation for 2 h,UV/Fenton treatment for 1.5 h,and electrocatalytic oxidation for 2 h,respectively.The effluent met the direct discharge requirements of the pollution control standard of the domestic landfill(GB16889-2008).The operational cost of landfill leachate membrane concentrate by such process treatment is 93.2RMB/m^3.