期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 403, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123847
关键词
Hexavalent chromium (Cr(VI)) contaminated soil; Microbial stabilization; Leaching toxicity; Bacterial diversity
资金
- National Natural Science Foundation of China [50908159]
The study found that the conversion rate of Cr(VI) in soil contaminated with high levels of Cr(VI) reached 97% after chemical reduction combined with microbial stabilization treatment, and the concentration of Cr(VI) in toxic solutions can be reduced by 95%. The bacterial community changed significantly during the reduction process of Cr(VI), with a decrease in species abundance and evenness. Dominant species in this study were Bacillus spp. and Halomonas spp.
In order to solve the problem of re-oxidation after chemical remediation of soil contaminated with high levels of hexavalent chromium (Cr(VI)), we investigated the use of chemical reduction combined with microbial stabilization to remediate soils contaminated with high Cr(VI) concentration. The leaching toxicity and microbial diversity of Cr(VI)-contaminated soil and the leaching toxicity of remediated soil oxidized by potassium permanganate (KMnO4) were measured. The results indicate that the conversion rate of Cr(VI) reached 97 %, and the concentration of Cr(VI) in toxic solutions leaching can be reduced by 95 % after 40 days of microbial stabilization. Sterilization experiments showed that the reduction of Cr(VI) by microorganisms is stable. The results of microbial diversity analysis indicate that bacterial community changed more than fungal community during the reduction process of Cr(VI), and the species abundance and species evenness of bacteria decreased. Bacillus spp. and Halomonas spp. were the dominant species in this study.
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