Actions for Mineral transformation and biomass accumulation associated with uranium bioremediation at Rifle, Colorado [electronic resource].

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Mineral transformation and biomass accumulation associated with uranium bioremediation at Rifle, Colorado [electronic resource].

Published
Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2009.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Injection of organic carbon into the subsurface as an electron donor for bioremediation of redox-sensitive contaminants like uranium often leads to mineral transformation and biomass accumulation, both of which can alter the flow field and potentially bioremediation efficacy. This work combines reactive transport modeling with a column experiment and field measurements to understand the biogeochemical processes and to quantify the biomass and mineral transformation/accumulation during a bioremediation experiment at a uranium contaminated site near Rifle, Colorado. We use the reactive transport model CrunchFlow to explicitly simulate microbial community dynamics of iron and sulfate reducers, and their impacts on reaction rates. The column experiment shows clear evidence of mineral precipitation, primarily in the form of calcite and iron monosulfide. At the field scale, reactive transport simulations suggest that the biogeochemical reactions occur mostly close to the injection wells where acetate concentrations are highest, with mineral precipitate and biomass accumulation reaching as high as 1.5% of the pore space. This work shows that reactive transport modeling coupled with field data can be an effective tool for quantitative estimation of mineral transformation and biomass accumulation, thus improving the design of bioremediation strategies.
Report Numbers
E 1.99:lbnl-2079e
lbnl-2079e
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Note
Published through SciTech Connect.
04/20/2009.
"lbnl-2079e"
Environmental Science&Technology FT
Wilkins, M.J.; Williams, K.H.; Li, L.; Steefel, C.I.; Hubbard, S.S.
Earth Sciences Division
Funding Information
DE-AC02-05CH11231
View MARC record | catkey: 14131127