Reduction remediation of hexavalent chromium by bacterial flora in Cr(VI) aqueous solution.
- Resource Type
- Article
- Authors
- Qian Wang; Xinhua Xu; Fanglin Zhao; Zhihao Liu; Jinan Xu
- Source
- Water Science & Technology. 2010, Vol. 61 Issue 11, p2889-2896. 8p.
- Subject
- *HEXAVALENT chromium
*WATER pollution
*BACTERIA
*HYDROGEN-ion concentration
*SEWAGE
- Language
- ISSN
- 0273-1223
Chromium(VI) is a priority pollutant in soils and wastewaters and reduction of Cr(VI) to Cr(III) is a solution to this problem. In this study a low-cost method was proposed to adapt indigenous bacteria and use them to reduce Cr(VI) in solutions. The experiment results show that Cr(VI) could be efficiently reduced by indigenous bacteria under anaerobic and pH-unadjusted conditions. After about 24 h the concentration of Cr(VI) could be reduced from 21.74 mg/L to below 0.5 mg/L. The observed Cr(VI) reduction rates were affected by temperature and pH. Cr(VI) in aqueous solutions could be reduced to Cr(III) completely and partly be incepted by the organisms. Cr(VI) reduction was enzyme-mediated. It was not an energy-conserving process but a detoxification reaction. This method could be used in an anaerobic reactor to treat low-concentration wastewater or industrial water as the last step. [ABSTRACT FROM AUTHOR]