六价铬还原菌剂载体研究及初步应用实验

Research on the Carriers of Chromium(Ⅵ) Reduction Agent and Its Initial Application Experiments

利用污染土壤中筛选出的六价铬还原土著微生物,筛选不同的载体制成固态菌剂,结果表明:稻壳、麦麸、稻糠配比为5:2:2时具有实用性,将该配比的菌剂施用到六价铬浸出液浓度从25.3～342.1mg/L的3组污染土壤中,120d后六价铬还原率均达到95%以上,且浸出液中六价铬浓度全部符合危险废物鉴别标准,说明该载体制成的还原菌剂可有效应用于铬污染土壤的生物修复工程。

Using indigenous microorganism screened out from Chromium（Ⅵ） contaminated soil,different carriers are chosen to make solid-state microbial agent.The experiment results show that the agent is practical when the proportion of rice hull,wheat bran and rice chaff is 5：2：2.The certain agent is applied to treat the contaminated soil that the Cr（Ⅵ） concentration of leachate is from 25.3 to 342.1 mg/L.The results indicate that the Cr（Ⅵ） reduction rate can attain 95% after 120 days and the Cr（Ⅵ） concentration in the leachate can reach the identification standards for hazardous wastes.The experiments prove that the reduction agent made by the chose carriers is efficient for biological remediation project of Cr（Ⅵ） contaminated soil.