铬污染土壤修复材料FeS2/Fe^0及外场强化修复技术研究

Remediation Material of FeS2/Fe^0 and Field Enhanced Remediation Technology for Chromium Contaminated Soil

以甘肃某铬化工场地污染土壤作为处理对象,通过黄铁矿高能球磨活化铁粉制备了铬还原修复材料FeS2/Fe^0,考察了该材料对铬污染土壤的还原修复效果,并探究了外场强化修复铬污染土壤的方法。结果表明,FeS2/Fe^0修复Cr(Ⅵ)含量为448.1 mg/kg的污染土壤,30 d后去除率达到99.1%,微波场可有效缩短修复周期,机械力—微波场联合作用可将总Cr(Ⅵ)含量为4995 mg/kg的污染土壤修复降至1.9 mg/kg。

Taking contaminated soil of a chromium chemical site in Gansu as treatment object,chromium reduction remediation material of FeS2/Fe^0 was prepared by high-energy ball milling of pyrite with iron powder.Effect of the material on reduction remediation of chromium-contaminated soil and method of field enhanced remediation of chromium contaminated soil were explored.The results show that removal rate of contaminated soil with Cr(Ⅵ)content of 448.1 mg/kg is 99.1%after 30 days by FeS2/Fe^0 remediation.Microwave field can effectively shorten the remediation period,and the combined action of mechanical force and microwave field can reduce contaminated soil with total Cr(Ⅵ)content of 4995 mg/kg to 1.9 mg/kg.