生活垃圾渗滤液金属污染物土柱模拟研究  

Simulation Study on Soil Column of Metal Pollutant in Leachate of Household Refuse

作　　者：王敏 朱歆莹 付常喜[2] 李克诚 WANG Min;ZHU Xi-ying;FU Chang-xi;LI Ke-cheng(Xuzhou Environmental Monitoring Center of Jiangsu Province,Xuzhou 221018,China;Xuzhou Institute of Technology,Xuzhou 221000,China;Middle School in Wenshang,Jining 272500,China)

机构地区：[1]江苏省徐州环境监测中心,江苏徐州221018 [2]徐州工程学院,江苏徐州221000 [3]汶上县第一中学,山东济宁272500

出　　处：《环境科技》2019年第6期29-34,共6页Environmental Science and Technology

基　　金：江苏省环境监测科研基金资助项目(1311)

摘　　要：通过实验室配水和原生垃圾渗滤液,及填埋场附近未经污染原生土和填埋场新覆土土柱模拟实验对比,研究垃圾渗滤液原生土壤金属迁移能力大小。结果表明,在实验周期内,渗滤液中碱(土)金属元素并未发生穿透现象,渗滤液淋滤土壤中碱(土)金属元素的交换顺序为K>Na>Mg>Ca,Ca更容易被Na和K取代而发生脱附,进入水体中;未经污染的深层土壤对重金属具有较强的吸附能力,重金属元素99%以上被土层吸附截留;渗滤液淋滤条件下,土层对不同重金属吸附能力从大到小依次为Cr>Tl>As>Mn>Pb,其中Cr更容易被土壤胶体吸附、络合,短期内不容易进入水体并迁移,但Pb主要受渗滤液有机成分的影响,更容易解析进入地下水;Tl在区域土壤背景值较高情况下,可能经渗滤液淋溶污染区域地下水。Through the comparison of laboratory water distribution and primary landfill leachate,as well as the simulation experiment of uncontaminated raw soil near the landfill and new overburden soil column near the landfill,the metal migration capacity of primary soil of landfill leachate was studied.The results showed that during the experimental period,alkali(soil)metal elements in the leachate did not penetrate,and the exchange sequence of alkali(soil)metal elements in the leachate leached soil was K>Na>Mg>Ca,and Ca was more likely to be replaced by Na and K to desorption and enter the water body.The deep unpolluted soil has a strong adsorption ability to heavy metals,and more than 99%of heavy metal elements are absorbed and trapped by the soil layer.Leachate leaching conditions,the soil of different adsorption capacity of heavy metals from big to small in turn for Cr>Tl>As>Mn>Pb,Cr was more likely to be soil colloid adsorption,complexation,not easy to enter the water body and migration in the short term,but the Pb was mainly affected by leachate organic ingredients,it is easier to parse into groundwater.Tl may be leached by leachate to contaminate the groundwater of the region when the regional soil background value is higher.

关 键 词：垃圾渗滤液 碱(土)金属 重金属 土柱模拟 

分 类 号：X5[环境科学与工程—环境工程]