垃圾填埋场中酸可挥发性硫与重金属的结合特性

酸可挥发性硫（AVS）对于控制重金属在沉积物/间隙水中的分配和重金属的生物可利用性和迁移性有重要意义.填埋场环境与海洋底泥环境相似,因此可以参考沉积物中n（AVS）/n（同步浸提金属,SEM）的测定方法测定填埋层垃圾n（AVS）/n（SEM）,发现n（AVS）/n（SEM）＜5%.SEM形态分析表明：SEM超出AVS的部分被其他的重金属结合相结合,AVS与Cu,Ni和Zn结合优先于铁氧化物结合态、锰氧化物结合态、碳酸盐结合态和可交换态;Cd和Pb与AVS结合优先于有机物结合态、锰氧化物结合态、碳酸盐结合态和可交换态.AVS的存在有利于重金属固定于填埋层中.

Priority of Acid Volatile Sulfide Binding to Heavy Metals in Municipal Solid Waste Landfill

Acid volatile sulfide(AVS) has shown its significance in controlling heavy metals partitioning between sediment and pore water,and in explaining the bioavailability of metal toxicants.The environments in landfill layer are analogous to that of marine sediments,so the ratio of AVS to simultaneously extracted metals(SEM) in landfill layer can be determinated referring to the analytical procedures of n(AVS)/n(SEM) in sediments.n(AVS)/n(SEM) in landfill layer is less than 5%.The surplus SEM that exceeds AVS is bound by other binding phases.For Cu,Ni and Zn AVS has priority to Fe oxides,Mn oxides,CO~(2-)_3 and physical sorbents;and for Cd and Pb,AVS has priority to organic matters,Mn oxides,CO~(2-)_3 and physical sorbents.AVS is favorable for keeping heavy metals in landfill layer.