期刊
PHYSICS AND CHEMISTRY OF THE EARTH
卷 36, 期 9-11, 页码 451-454出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pce.2010.05.002
关键词
AQDS (anthraquinone-2.6-disulfonate); Humus-reducing bacteria; Cr(VI); Remediation
资金
- National Important Project on Water Pollution and Control [2008ZX07101-006]
- Science and Technology Department of Zhenjiang Province [2008C23 100]
Hexavalent chromium (Cr(VI)) is a priority pollutant in the USA and many other countries. This study investigated the simultaneous remediation of Cr(VI) in sediment enriched with quinone-reducing microorganisms via a closely coupled, biotic-abiotic pathway. The results showed that Cr(VI) remediation was achieved by sediment adsorption and reduction of quinone-reducing microorganism. Moreover, microorganism reduction of Cr(VI) could be continued when sediment adsorption was saturated after long-term Cr(VI) remediation. The acetate and anthraquinone-2,6-disulfonate (AQDS), which acted as exogenous carbon and electron shuttle, respectively, were two crucial factors. The optimum concentrations of acetate and AQDS were 5 mM and 1 mM when the initial Cr(VI) concentration was 10 mg/L. AQDS was recycled, and it acted in a catalytic-type manner for the bacterial reduction of Cr(VI). Thus, biological humus reduction might provide an extensive pathway for the sequestration and detoxification of Cr(VI) in anaerobic soils, water, and industrial effluents. (c) 2010 Elsevier Ltd. All rights reserved.
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