中文摘要：

通过土柱模拟实验研究了垃圾渗滤液中的重金属在地下环境中的衰减效率和机理．结果表明，不同顺序氧化还原带对不同的重金属去除效率不同，硫酸盐还原带的去除效率最高，Cr、Ni、Zn、As、Cd和Pb的去除率分别为93．27％、73．33％、81．52％、76．83％、100％和100％；氧还原带的去除率最低，分别为36．13％、20．45％、7．45％、25．86％、13．04％和37．36％．各顺序氧化还原带沉积物对重金属的富集能力也不同，产甲烷带、硫酸盐还原带和硝酸盐还原带的富集能力相对较强，其中，硫酸盐还原带的富集能力最强，沉积物中Cr、Ni、Zn、As、Cd和Pb的含量分别增长了8．5％、11．3％、19．9％、75．6％、14．8％和14-3％；而铁还原带和氧还原带的富集能力相对较差，氧还原带沉积物中Cr、Ni、Zn、As、Cd和Pb的含量分别降低了1．86％、8．6％、22．1％、26．4％、5．8％和25．6％．因此，垃圾渗滤液地下环境中重金属的衰减受吸附、沉淀和络合等作用的控制．

英文摘要：

A soil column filled with sandy soil was constructed to investigate degradation mechanism and efficiency of heavy metal removal in landfill leachate in subsurface environment. Removal efficiency of different heavy metals varied with redox zones. In sulfate reduction zone, the removal efficiency was the highest, for Cr, Ni, Zn, As, Cd and Pb was 93.27%, 73.33%; 81.52%, 76.83%, 100% and 100%, respectively, while in oxygen reduction zone the removal efficiencies was the lowest, only 36.13%, 20.45%, 7.45%, 25.86%, 13.04% and 37.36%, respectively. Heavy metal deposits in sediments varied at different redox zones. The content of heavy metals in sediments of methanogenic zone, sulfate reduction zone and nitrate reduction zone were high with sulfate reduction zone the highest, in which the amount of Cr, Ni, Zn, As, Cd and Pb increased by 8.5%, 11.3%, 19.9%, 75.6%, 14.8%, and 14.3% respectively. The content of heavy metals in sediments of iron and oxygen reduction zones were relatively low, in the latter the content of Cr, Ni, Zn, As, Cd and Pb decreased to 1.86%, 8.6%, 22.1%, 26.4%, 5.8% and 25.6% respectively. Therefore, the attenuation of heavy metals in a landfill leach,ate plume was controlled by sorption, precipitation and complexation.