填埋场中水泥土屏障对金属离子的隔离效果  

Isolation Effect of Cement-soil Barrier Upon Heavy Metal in MSW Landfills

作　　者：席永慧[1] 张广年[1] 吴晓峰[1] 解子军[2] 许丽萍[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海岩土工程勘察设计研究院有限公司,上海200032

出　　处：《同济大学学报（自然科学版）》2013年第7期1067-1071,共5页Journal of Tongji University:Natural Science

基　　金：上海市城乡建设和交通委员会科研项目(重科:2008-006)

摘　　要：填埋法是处理城市固体垃圾最经济和有效的方法之一,当采用水泥土墙作为垃圾填埋场的防渗帷幕时,在设计中并未将污染物以扩散形式的迁移考虑进去.通过大型模型实验分析屏障厚度和水泥掺量对重金属离子的隔离效果的影响,应用数值模拟方法对锌离子在水泥土中的扩散系数进行求解.实验结果表明,随着水泥掺量和屏障厚度的增加,水泥土屏障对金属离子的隔离效果会大幅提升.同时,增加水泥掺量取得的隔离效果要优于增加屏障厚度.试验结果还表明金属锌离子在土中的扩散系数远远大于在水泥土的扩散系数.Land filling is one of the most economical and efficient ways to treat municipal solid waste （MSW）. When cement-soil barrier was used in landfills as vertical barrier curtains, diffusion of contaminant was not taken into consideration in design. Influence of barrier＇s thickness and cement content on isolation effect of heavy metal was analyzed through a large model test. Diffusion coefficient of Znz＋ in cement-soil was calculated with numerical simulation method. The results show that isolation effect will be enhanced greatly by increasing the cement content or the thickness of barrier. In fact, the barrier cement content affects the isolation more than the barrier thickness. The results also prove that the diffusion coefficient of Znz＋ in soil is far more than that in cement-soil.

关 键 词：垃圾填埋场 水泥土屏障 重金属离子 扩散 水泥掺量 

分 类 号：X53[环境科学与工程—环境工程]