Microbial reduction of hexavalent chromium by landfill leachate.
The reduction of hexavalent chromium (Cr(VI)) in municipal landfill leachates (MLL) and a non-putrescible landfill leachate (NPLL) was investigated. Complete Cr(VI) reduction was achieved within 17 days in a MLL when spiked with 100 mg l(-1) Cr(VI) or less. In the same period, negligible Cr(VI) reduction was observed in NPLL. In MLL, Cr(VI) reduction was demonstrated to be a function of initial Cr(VI) concentration and bacterial biomass and organic matter concentrations. The bacteria were observed to tolerate 250 mg l(-1) Cr(VI) in MLL and had an optimal growth activity at pH 7.4 in a growth medium. The MLL also possessed an ability to sequentially reduce Cr(VI) over three consecutive spiking cycles.
Li
Yarong
Y
School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney 2052, Australia. yarong.li@environment.nsw.gov.au
Low
Gary K-C
GK
Scott
Jason A
JA
Amal
Rose
R
D001419:Bacteria / Q000378:metabolism*; D018533:Biomass; D002857:Chromium / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D002857:Chromium