好氧高温堆肥处理对猪粪中重金属形态的影响

 用 Tessier 连续提取法研究了好氧高温堆肥处理对猪粪中重金属结合形态变化的影响.结果表明,经过好氧堆肥处理,猪粪中 Pb、Cu、Zn、Ni、Cr、Cd、As 的总浓度升高;碳酸盐结合态 Ni、Zn 的浓度降低,其余 Pb、Cu、Cr、Cd 的浓度都升高;硫化物及有机结合态、残渣态重金属的浓度普遍升高,仅有硫化物及有机结合态 As 和 Zn 的浓度下降;可交换态 Cu、Zn、Cr、As 的浓度显著降低.堆肥处理可以降低可交换态和碳酸盐交换态 Pb、Ni、Cu、Cr、Zn、As 和铁锰氧化物结合态 Pb、Cu、Cr、As 的分配系数,因此可以降低猪粪中重金属的有效性.堆肥处理有利于降低猪粪土地利用中重金属污染的风险.

Influence of high temperature aerobic composting treatment on the form of heavy metals in pig manure

The influence of high temperature aerobic composting treatment on the change of heavy metal combined form in pig manure was studied using Tessier sequential extraction method. After aerobic composting treatment, the total concentrations of Pb, Cu, Zn, Ni, Cr, Cd, As in pig manure increased. The concentrations of residual forms increased generally; only the concentrations of sulfide and organic combined form As and Zn decreased. The concentrations of exchangeable form Cu, Zn, Cr and As decreased markedly. Composting treatment could decrease the distribution coefficients of exchangeable form and carbonate form Pb, Ni, Cu, Cr, Zn, As and Fe-Mn oxides combined form Pb, Cu, Cr and As. Therefore, it could decrease the effectiveness of heavy metals in pig manure. Composting treatment is a possible way to reduce the risk of heavy metal pollution in the utilisation of pig manure on land.