堆肥污泥重金属在黄土层中的淋溶迁移试验

采用经强化重金属后的堆肥污泥作为淋溶土柱的重金属来源,通过土柱淋溶试验,研究了堆肥污泥Cd、Ni、Pb、Cu、Zn 5种重金属在黄土层中的垂直迁移特征,探讨了堆肥污泥施用量及不同淋溶水量对黄土层中重金属迁移分布的影响。结果表明,Cd、Ni的淋溶迁移性较好,Pb、Cu、Zn整体迁移性较差。Cd和Cu随淋溶水量增加淋出作用明显增强,增大淋溶水量对Ni和Pb的淋出影响无明显增强,表层土中Zn、Ni、Pb含量随淋溶水量增大而累积,深层土情况各异。

Experiment on Leaching and Moving of Heavy Metals of Composted Sludge in Loess

Using composted sludge adding heavy metals as the heavy metal resource of leaching loess column,the vertical migration of heavy metals(Cd,Ni,Pb,Cu,Zn) in composed sludge was studied;and the impact of the amount of composed sludge and leaching water on migration of heavy metals in loess was investigated.The results showed that Cd,Ni had good leaching migration ability;but Pb,Cu,Zn had ability;poor migration ability.As the water increased,Cd and Cu leached more apparently;but it did not work for Ni and Pb.The amount of Zn,Ni,Pb in surface loess was accumulated as the the water increased,but in deep loess the situation was varied.