填埋场中水泥土屏障对金属离子的隔离效果研究

Study on isolation effect of cement-soil Barrier upon heavy metal in MSW landfills

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。本文通过大型模型实验来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。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。

Abstract:

Land filling is one of the most economical and efficient ways to treat Municipal Solid Waste (MSW). When cement-soil barrier is used in landfills as vertical barrier curtains, diffusion of contaminant is not taken into consolidation in design. In this paper, influence of barrier’s thickness and cement content on isolation effect of heavy metal is analyzed though a large model test. The results show that isolation effect will be enhanced greatly by increasing the cement content or thickness of barrier. Moreover, isolation effect that is enhanced by increasing the cement content of barrier is more than by increasing the thickness of barrier. The results also prove that the diffusion coefficient of Zn2+ in soil is far great than that in cement-soil.