期刊
CHEMOSPHERE
卷 52, 期 9, 页码 1523-1529出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0045-6535(03)00491-0
关键词
hexavalent chromium; metal reduction; sole electron acceptor; marine enrichment consortium; sulfate-reducing bacteria; bioremediation
An enrichment consortium and an isolate (isolate TKW) of sulfate-reducing bacteria (SRB) have been obtained from metal-contaminated marine sediments of Tokwawan, Hong Kong SAR. These bacteria are capable of reducing highly toxic and soluble hexavalent chromium (Cr6+) enzymatically into less toxic and insoluble trivalent chromium (Cr3+) under anaerobic conditions. The enrichment consortium almost completely (98.5%) reduced 0.6 mM Cr6+ in 168 h and the rate of reduction was 0.5 g (Cr6+) g (protein)(-1) h(-1). In comparison, with Cr6+ as the sole electron acceptor (as a surrogate for SO24-), isolate TKW reduced 94.5% of the initially added Cr6+ (0.36 mM) in 288 h, with the rate of 0.26 g (Cr6+) g (protein)(-1) h(-1). Adsorption by these bacteria was not the major mechanism contributing to the transformation or removal of Cr6+. The biomass and Cr3+ in the cultures increased simultaneously with the reduction of Cr6+. These indigenous SRB might have potential application in bioremediation of metal contaminated sediments. (C) 2003 Elsevier Ltd. All rights reserved.
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