Microbial Reduction of Hexavalent Chromium in Landfill Leachate
Yarong Li A , Gary K.-C. Low A D , Ying Lei B , Cheryl E. Halim C and Rose Amal CA Environmental Forensic and Analytical Science Section, Department of Environment and Conservation (NSW), Lidcombe NSW 2141, Australia.
B Institute for Biotechnology and Infectious Diseases, University of Technology, Sydney NSW 2065, Australia.
C School of Chemical Engineering and Industrial Chemistry, University of New South Wales, Sydney NSW 2052, Australia.
D Author to whom correspondence should be addressed (e-mail: lowg@epa.nsw.gov.au).
Australian Journal of Chemistry 57(10) 967-970 https://doi.org/10.1071/CH04069
Submitted: 19 March 2004 Accepted: 25 June 2004 Published: 1 October 2004
Abstract
Landfill leachates were found to exhibit reducing properties whereby chromium(vi) was converted into chromium(iii). The reduction is attributed to a microbial process in the presence of high concentrations of organic materials in the leachates. Nonputrescible landfill leachate (NPLL) was found to reduce CrVI to a lesser extent than the municipal landfill leachate (MLL). Microbial reduction of CrVI was also found to occur under alkaline conditions in extracts from a cementitious waste. A 55% reduction of CrVI was achieved by enriching the extract with bacteria and organic material.
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