矿物质沉淀对填埋场排水层渗透性影响的试验研究  

Laboratory Studies on Permeability of Drainage Layer Influenced by Mineral Precipitation in Landfill Sites

作　　者：练翠侠[1] 曹丽文[1] 刘会虎[1] 李林[1] 倪勇[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008

出　　处：《环境卫生工程》2007年第6期15-17,21,共4页Environmental Sanitation Engineering

基　　金：国家自然科学基金项目(40372069);教育部新世纪优秀人才支持计划项目(NCET-05-0479);"江苏省青蓝工程"高校中青年学术带头人基金;中国矿业大学科技基金项目(OF4506)

摘　　要：利用土柱试验,研究了渗沥液渗流经过填埋场排水层的水质特征和渗透系数变化规律,分析了矿物质沉淀的生成机制及其对填埋场排水层渗透性的影响。结果表明:流经排水层时,渗沥液中的Ca2+、Mg2+含量降低,同时,渗沥液中的挥发性脂肪酸厌氧发酵,使渗沥液中以弱酸(碳酸)替代强酸(乙酸),提高了渗沥液pH,促使渗沥液中金属离子与碳酸根离子结合形成碳酸盐沉淀,并积聚在排水介质孔隙中,降低排水层的渗透系数。Using column tests, water quality character of leaehate and permeability coefficient variation law when leaehate passing through the drainage layer in landfill sites were studied, and genetic mechanism of mineral precipitation and its influence on permeability of drainage layer were analyzed. The results showed that concentrations of Ca^2＋ and Mg^2＋ in leachate decreased after leachate passed through drainage layer. Meanwhile, pH of leachate increased due to anaerobic ferment of volatile fatty acids that primarily the form of weak acid （carbonic acid） replaced the stronger acid （acetic acid）. The result resulted in the carbonate ion and iron ion in leachate integrated and deposited in the pore space of drainage medium, and decreased permeability coefficient of drainage layer.

关 键 词：渗沥液 矿物质沉淀 排水层 渗透系数 

分 类 号：X703[环境科学与工程—环境工程]