堆腐法钝化重金属污染土壤效果的研究

Study on passivation effect of heap rot method on heavy metal contaminated soil

通过污泥、树叶、土壤不同添加比例和堆腐条件下堆腐化钝化重金属,以Cr、Cd、Ni和Pb为例,研究了堆腐化对堆腐前后堆体pH、重金属总量以及钝化效果的影响。堆腐化处理对土壤中的重金属有一定的钝化效果,可以促使酸可提取态和可还原态重金属向可氧化态和残渣态转化,大大降低了重金属的迁徙率和环境风险。

The effects of composting on the pH,total amount of heavy metals and passivation effect of composting before and after composting are studied by taking Cr,CD,Ni and Pb as examples.Com-posting treatment has a certain passivation effect on heavy metals in soil,which can promote the transformation of acid extractable and reducible heavy metals to oxidizable and residual states,and greatly reduce the migration rate and environmental risk of heavy metals.