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Effects of indigenous bacteria on Cr(VI) reduction in Cr-contaminated sediment with industrial wastes

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Authors
Lee, S.E.; Lee, J.-U.; Lee, J.S.; Chon, H.T.
Issue Date
2006
Publisher
Elsevier
Citation
J. Geochem. Explor. 88, 1-3
Keywords
Indigenous bacteriaChromiumReductionCr(VI)
Abstract
Black, clay-like sediments have been obtained from the area of the pigment manufacturing factories in Dongducheon city, Korea. These sediments were contaminated by heavy metals, especially chromium (700 mg/kg). Indigenous bacteria in the sediments were isolated to investigate their ability to reduce Cr(VI) to Cr(III). The enriched bacterial consortium reduced over 99% of dissolved Cr(VI) in 96 h from the onset of the experiments under anaerobic condition, while there was no change in Cr(VI) concentration until 300 h in abiotic controls. Total amount of dissolved Cr decreased simultaneously when Cr(VI) was reduced, which was likely due to precipitation of Cr(OH)3 after microbial reduction of Cr(VI) to Cr(III). Under aerobic condition, only 30% of dissolved Cr(VI) was reduced by indigenous bacteria until 900 h. The reduction of Cr(VI) did not accompany bacterial growth since the amount of protein did not show a significant change with time both in the presence and absence of O2. These indigenous bacteria may play a role in the treatment of Cr(VI)-contaminated sediments.
ISSN
0375-6742
Language
English
URI
http://hdl.handle.net/10371/7499
DOI
https://doi.org/10.1016/j.gexplo.2005.08.013
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Journal Papers (저널논문_에너지시스템공학부)
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