GAC颗粒电极的改性制备及处理老龄垃圾渗滤液  

Preparation of GAC particle electrode and treatment of old landfill leachate

作　　者：张袤 李祥[1,2,3] 王军 袁砚 黄勇[1,2] ZHANG Mao;LI Xiang;WANG Jun;YUAN Yan;HUANG Yong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,China;Suzhou Tianjun Environmental Technology Co.,LTD.,Suzhou 215000,China;Suzhou Gu Yue Shui Wan Environmental Protection Technology Co.,Ltd,Suzhou 215011,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009 [2]苏州科技大学,江苏水处理技术与材料协同创新中心,江苏苏州215009 [3]苏州天竣环境科技有限公司,江苏苏州215000 [4]苏州古月水湾环保科技有限公司,江苏苏州215011

出　　处：《中国环境科学》2024年第12期6796-6806,共11页China Environmental Science

基　　金：江苏省水处理技术与材料协同创新中心基金资助项目(XTCXSZ2022-1)。

摘　　要：针对老龄垃圾渗滤液中难降解污染物难以生化处理的需求,而常规固定极板电化学系统存在极板钝化、空间利用率和处理效能低等缺陷,采用浸渍法制备改性Mn-GAC颗粒电极,并构建三维电解系统,考察其对老龄垃圾渗滤液的综合降解效果.结果表明:通过预实验及扫描电镜(SEM)等方法表征,在焙烧时间3h、焙烧温度600℃、浸渍时间8h条件下可制备出性能良好的颗粒电极;在反应初始pH值为3、颗粒电极投加量33.3g/L、电流密度160mA/cm^(2)、搅拌转速700r/min条件下,老龄垃圾渗滤液中的COD、TP、NH4+-N、TN去除率可达81.56%、99.62%、62.82%、82.47%,且能耗仅有0.125kWh/g,通过氧化机制分析表明污染物的去除主要由·OH和活性氯所主导的间接氧化作用来完成,占总贡献的70%.The conventional fixed plate electrochemical system presents limitations such as electrode passivation,low space utilization,and reduced treatment efficiency.To address these issues,Mn-GAC particle electrodes were prepared using the impregnation method,and a three-dimensional electrolytic system was constructed to evaluate the comprehensive degradation effect on aged landfill leachate.The results demonstrated that particle electrodes with good performance could be successfully prepared under the conditions of 3hours of calcination time,a calcination temperature of 600℃,and an impregnation time of 8hours,as verified by pre-experiments and scanning electron microscopy(SEM).Under optimal conditions—initial pH value of 3,particle electrode dosage of 33.3g/L,current density of 160mA/cm^(2),and stirring speed of 700r/min—the removal rates of COD,TP,NH4+-N,and TN from the aged landfill leachate reached 81.56%,99.62%,62.82%,and 82.47%,respectively,with an energy consumption of only 0.125kWh/g.The analysis of the oxidation mechanism indicated that pollutant removal was primarily achieved through indirect oxidation,dominated by·OH and active chlorine,accounting for 70%of the total contribution.

关 键 词：颗粒电极改性 活性炭 老龄垃圾渗滤液 间接氧化 三维电解 

分 类 号：X703.1[环境科学与工程—环境工程]