硫酸盐还原菌原位修复六价铬污染土壤

以FeSO₄化学还原法为对照,开展硫酸盐还原菌原位修复铬污染土壤的田间试验研究。试验结果表明:微生物法处理后,土壤中Cr(Ⅵ)含量从6.48 mg/kg降至0.95 mg/kg,下降率为85.33%,修复后的土地质量符合国家一类建设用地的标准;土壤浸出液中Cr(Ⅵ)质量浓度从0.162 mg/L降至0.004 mg/L,下降率为97.53%;土壤中硫酸根浓度略有降低,硫酸盐还原菌的丰度显著增加。微生物原位修复铬污染土壤的效果好于化学还原法。

In-situ remediation of hexavalent chromic-contaminated soil with sulfate-reducing bacteria

A pilot study on the in situ remediation of hexavalent chromium-contaminated soil by sulfate-reducing bacteria was carried out,compared with the effects of chemical reduction method using FeSO₄. The results show that:After microbial treatment,the content of Cr(Ⅵ) in soil is decreased from 6.48 mg/kg to 0.95 mg/kg,with a decrease rate of 85.33%,and the quality of the remediated soil meet the national standard for Class 1 of construction land;The mass concentration of Cr(Ⅵ) in the soil leaching solution is decreased from 0.162 mg/L to 0.004 mg/L,with a decrease rate was 97.53%;The concentration of sulfate in the soil is decreased slightly,while the abundance of sulfate-reducing bacteria is increased significantly. The in situ remediation effect of chromium-contaminated soil by microbial method is better than that by chemical reduction method.