铅锌矿区土壤重金属污染MnFe_2O_4纳米微粒修复技术研究

Remediation of lead-zinc polymetallic mine contaminated soils by MnFe_2O_4 micro-particles

为研究铁锰氧化物纳米颗粒(MnFe_2O_4)在重金属污染土壤中的修复效果,文中以内蒙古铅锌矿区重金属污染土壤为研究对象,综合采用静态震动浸出实验和土柱淋洗实验,系统分析了不同梯度铁锰氧化物纳米颗粒和pH值对土壤重金属的吸附效应。结果表明:随MnFe_2O_4用量增加(<10g/kg),土壤淋洗液中铜(Cu)、铅(Pb)、锌(Zn)和砷(As)浓度呈显著降低趋势;不同pH值条件下,随pH降低,淋洗液中Cu,Pb,Zn浓度则逐步升高,As浓度则略微减少。相比于重金属污染土壤,经MnFe_2O_4修复后,土壤中Cu、Pb、Zn、As去除率分别高达93. 6%、69. 2%、57. 0%和99. 7%,效果显著。

In this research,the heavy metal contaminated soil( brown earth) in lead-zinc mining area of Wulatehouqi Banner in Inner Mongolia was used as the test object to study the effect of iron-manganese oxide nanoparticles( MnFe2O4) on the remediation of heavy metal-contaminated soils.The effects of MM dosage on remediation efficiency were determined with static vibration leaching experiment,and the heavy metals release risk of treated soil was studied by column leaching experiment.The results showed that the leached Cu,Pb,Zn,As concentration decreased drastically with increasing MM dosage,when the dosage was lower than 10 g/Kg.In comparison with non-amended soils,the total amounts of Cu,Pb,Zn,and As released from amended soils were reduced by 93.6%,69.2%,57.0%,and 99.7%,respectively.The MM is a kind of promising amendment for heavy metals contaminated soil.