填埋场酸可挥发硫测定及对重金属迁移性的影响

Determination of Acid Volatile Sulfide (AVS) in Municipal Solid Waste Landfill and Analysis of Its Effect on Heavy Metals Mobility

酸可挥发硫(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及迁移性有重要意义。填埋场环境与海洋底泥中相似,因此参考沉积物中AVS和SEM的测定方法来研究填埋垃圾中重金属的迁移性。测定了填埋垃圾AVS的最佳反应条件,并在该条件下测定了杭州天子岭垃圾处理处置总场不同填埋深度垃圾的AVS与同步浸提金属(SEM),发现AVS随着填埋深度的增加而增加,但是n(SEM) n(AVS)远远大于1,为25～45,说明填埋场中AVS不是重金属的主要结合相,AVS不是影响填埋场中重金属迁移性的主要因素。

Acid volatile sulfide (AVS( has been shown significant in controlling heavy metals partitioning between sediment and pore water and in explaining the bioavailability of metal toxicants. The environment in landfills is analogous to that of marine sediments, and so the mobilization of heavy metals in landfills can be studied with the process of n(AVS(/n(SEM( in sediments. A method for analyzing AVS and simultaneously extracted metals (SEM( in landfills was developed and optimum conditions were discussed. AVS and SEM values in Tianziling landfill layers in different depths were determined. It is found that AVS value increases with the depth, but AVS concentration is very low and the molar ratios of SEM to AVS is between 25 and 45, which indicates that AVS is not the main phase to combine heavy metals in landfill.