Remediation of Lead Zinc Mine Polluted Soil with Red Mud,Silkworm Sand,Ferrous Sulfate Passivating Agents
In order to study the heavy metal pollution of the surrounding farmland soil and water sources caused by the waste generated during the mining process.The polluted soil around the lead-zinc mine in Yangshuo County,Guilin City,Guangxi Province was taken as research object.The indoor soil cultivation experiment was adopted.Compound passivators were prepared by adding different ratios of red mud,silkworm sand and ferrous sulfate to analyze the effects of different passivators and their dosages on the compound contamination of arsenic,lead and cadmium in the soil,so as to seek for a suitable compound passivator.The results show that different ratios of red mud,silkworm sand and ferrous sulfate can change the content of arsenic,lead and cadmium in the three heavy metals in the contaminated soil in different degrees and biological activity,of which 0.2％silkworm sand+0.8％ferrous sulfate have the best effect on the remediation of arsenic,lead and cadmium in the effective state are reduced by 70.08％,38.80％and 1.49％,respectively,and the residual state of arsenic,lead and cadmium increase by 66.67％,3.20％and 10％,respectively.Soil pH is highly significant positively correlated with effective state arsenic and effective state lead(P＜0.01),and significantly negatively correlated with effective state cadmium(P＜0.05).Soil organic matter wad highly significant positively correlated with effective arsenic.The composite passivation agent of 0.2％silkworm sand+0.8％ferrous sulfate have the best passivation effect on heavy metals in arsenic cadmium lead contaminated soil.The research results can provide data support for the improvement of composite passivation materials in mining soil treatment.
万方数据
维普
