堆肥污泥中重金属形态分布及在矿山复垦过程中迁移转化研究

Speciation Distribution of Heavy Metals in Compost Sludge and Transformation in Mine Reclamation the process of

文章以城市污泥与餐厨垃圾混合好氧堆肥,研究了堆肥产品进行矿山复垦的可行性。结果表明:好氧堆肥使堆体中Cd,Pb和Cr三种重金属质量分数升高,Cu和Hg的含量略有降低,使Cr,Cu,Pb,Cd四种重金属的有效态有所降低,Hg强有机结合态略有增加,但5种重金属生物有效性均减少。堆肥污泥复垦矿山土壤中表层土壤中Cr、Pb的浓度先降低后升高;Cu、Cd、Hg的浓度先升高后降低;Cd的浓度随着深度的增加而增加,Cr、Cu、Hg主要积累在表层土壤,Pb主要积累在土壤中部。当污泥的施用量不超过120 t·hm^(-2)时,对矿山土壤重金属的生态风险较低。

This paper studied aerobic composting with municipal sludge and kitchen.The morphological changes of heavy metals during composting and the leaching characteristics of compost sludge in mine reclamation were studied.The results showed that aerobic composting increased the mass fractions of Cd,Pb and Cr,slightly decreased the contents of Cu and Hg,decreased the effective states of Cr,Cu,Pb and Cd,and slightly increased the strong organic binding state of Hg,but the bioavailability of the five heavy metals decreased.In the reclaimed mine soil with compost sludge,the concentrations of Cr and Pb in surface soil decreased first and then increased.The concentrations of Cu,Cd and Hg increased first and then decreased;cd concentration increased with depth,Cr,Cu,Hg mainly accumulated in the surface soil,Pb mainly accumulated in the middle of the soil.When the application amount of sludge is less than 120 t·hm^(-2),the ecological risk of heavy metals in mine soil is low.