Journal
BIODEGRADATION
Volume 21, Issue 1, Pages 81-95Publisher
SPRINGER
DOI: 10.1007/s10532-009-9283-x
Keywords
Uranium reduction; Sulfate-reducing bacteria; Hydrogen sulfide; Growth kinetics; Ferrous iron
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Funding
- Environmental Remediation Science Program (ERSP)
- U.S. Department of Energy [DOEAC05-00OR22725]
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In situ remediation of uranium contaminated soil and groundwater is attractive because a diverse range of microbial and abiotic processes reduce soluble and mobile U(VI) to sparingly soluble and immobile U(IV). Often these processes are linked. Sulfate-reducing bacteria (SRB), for example, enzymatically reduce U(VI) to U(IV), but they also produce hydrogen sulfide that can itself reduce U(VI). This study evaluated the relative importance of these processes for Desulfovibrio aerotolerans, a SRB isolated from a U(VI)-contaminated site. For the conditions evaluated, the observed rate of SRB-mediated U(VI) reduction can be explained by the abiotic reaction of U(VI) with the microbially-generated H2S. The presence of trace ferrous iron appeared to enhance the extent of hydrogen sulfide-mediated U(VI) reduction at 5 mM bicarbonate, but had no clear effect at 15 mM. During the hydrogen sulfide-mediated reduction of U(VI), a floc formed containing uranium and sulfur. U(VI) sequestered in the floc was not available for further reduction.
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