Isolation and characterization of Cr(VI) reducing Cellulomonas spp. from subsurface soils: Implications for long-term chromate reduction

Journal Article · Thu Feb 01 00:00:00 EST 2007 · Bioresource Technology

DOI:https://doi.org/10.1016/j.biortech.2006.02.023· OSTI ID:912333

Viamajala, S; Smith, W; Sani, R; Apel, W; Petersen, J; Neal, A; Roberto, F; Newby, D; Peyton, B

Microbial enrichments from Cr(VI) contaminated and uncontaminated US Department of Energy Hanford Site sediments produced Cr(VI) reducing consortia when grown in the presence of Cr(VI) with acetate, D-xylose or glycerol as a carbon and energy source. Eight of the nine isolates from the consortia were Gram positive and four of these were identified by 16S rRNA sequence homology and membrane fatty acid composition as belonging to the genus Cellulomonas. Two strains, ES6 and WS01, were further examined for their ability to reduce Cr(VI) under growth and non-growth conditions. During fermentative growth on D-xylose, ES6 and WS01 decreased aqueous Cr(VI) concentrations from 0.04 mM Cr(VI) to below the detection limit (0.002 mM Cr(VI)) in less than three days and retained their ability to reduce Cr(VI) even after four months of incubation. Washed ES6 and WS01 cells also reduced Cr(VI) under non-growth conditions for over four months, both with and without the presence of an exogenous electron donor. K-edge XANES spectroscopy confirmed the reduction of Cr(VI) to Cr(III). The ability to reduce Cr(VI) after growth had stopped and in the absence of an external electron donor, suggests that stimulation of these types of organisms may lead to effective long-term, in situ passive reactive barriers for Cr(VI) removal. Our results indicate that Cr(VI) reduction by indigenous Cellulomonas spp. may be a potential method of in situ bioremediation of Cr(VI) contaminated sediment and groundwater.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: DOE - SC
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 912333
• Report Number(s): INL/JOU-06-12067; BIRTEB; TRN: US200801%%768
• Journal Information: Bioresource Technology, Vol. 98, Issue 3; ISSN 0960-8524
• Country of Publication: United States
• Language: English

Related Subjects

99 - GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
BINDING ENERGY
BIOREMEDIATION
CARBON
CARBOXYLIC ACIDS
CHROMATES
ELECTRONS
ENERGY SOURCES
GLYCEROL
INCUBATION
MEMBRANES
REMOVAL
SEDIMENTS
SENSITIVITY
SOILS
SPECTROSCOPY
STIMULATION
STRAINS
VALENCE
bioremediation
cellulomonas
chromium
fermentative microorganisms