期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 21, 页码 8127-8131出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.050
关键词
Chromate; Mediated reduction; Redox mediator; Lawsone
资金
- National Key Scientific and Technology Project for Water Pollution Treatment of China [2008ZX07208-004-2]
- National Natural Science Foundation of China [50808029]
- Fundamental Research Funds for the Central Universities
- China Postdoctoral Science Foundation [200902538]
- [IRT0813]
The reduction of Cr(VI) by resting Escherichia coli cells was significantly enhanced by the quinone redox mediators, lawsone, menadione, anthraquinone-2-sulfonate and anthraquinone-2,6-disulfonate. In the presence of 0.2 mM lawsone, over 97.5% Cr(VI) (100 mg l(-1)) was reduced in 4 h. The mediated reduction occurred at initial Cr(VI) concentrations of 50-250 mg l(-1), and increased with increasing initial biomass concentrations from 0.05 to 1.2 g l(-1). The addition of glucose as electron donor promoted the reduction process. Cu2+, Ni2+ and Co2+ inhibited, whereas Mn2+ and Pb2+ stimulated reduction. Four rounds of mediated reduction were completed in 19 h, suggesting its stability and persistence. The efficient mediated microbial reduction of Cr(VI) is promising for rapid anaerobic removal of chromate. (c) 2010 Elsevier Ltd. All rights reserved.
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