Stimulating the In Situ Activity of Geobacter Species To Remove Uranium from the Groundwater of a Uranium-Contaminated Aquifer

@article{Anderson2003StimulatingTI,
  title={Stimulating the In Situ Activity of Geobacter Species To Remove Uranium from the Groundwater of a Uranium-Contaminated Aquifer},
  author={Robert T. Anderson and Helen A. Vrionis and Irene Ortiz-Bernad and Charles T. Resch and Philip E. Long and Richard D. Dayvault and Kenneth E. Karp and Sam J. Marutzky and Donald R. Metzler and Aaron D. Peacock and David C. White and Mary-Anne Lowe and Derek R. Lovley},
  journal={Applied and Environmental Microbiology},
  year={2003},
  volume={69},
  pages={5884 - 5891}
}
ABSTRACT The potential for removing uranium from contaminated groundwater by stimulating the in situ activity of dissimilatory metal-reducing microorganisms was evaluated in a uranium-contaminated aquifer located in Rifle, Colo. Acetate (1 to 3 mM) was injected into the subsurface over a 3-month period via an injection gallery composed of 20 injection wells, which was installed upgradient from a series of 15 monitoring wells. U(VI) concentrations decreased in as little as 9 days after acetate… 
Sustained removal of uranium from contaminated groundwater following stimulation of dissimilatory metal reduction.
TLDR
An unexpected third phase during which U(VI) removal continues even after acetate additions are stopped is revealed, which may potentially enhance the cost effectiveness of in situ uranium bioremediation.
Speciation and Reactivity of Uranium Products Formed during in Situ Bioremediation in a Shallow Alluvial Aquifer
TLDR
The results of in situ U(VI) bioreduction experiments at the Integrated Field Research Challenge site in Rifle, Colorado, USA highlight the importance of considering noncrystalline U(IV) formation across a wide range of aquifer parameters when designing in situ remediation plans.
Microbial Communities in Contaminated Sediments, Associated with Bioremediation of Uranium to Submicromolar Levels
TLDR
Most-probable-number estimations indicated that microorganisms implicated in bioremediation accumulated in the sediments of the treatment zone but were either absent or in very low numbers in an untreated control area, which was likely related to the hydraulic pathway and to electron donor metabolism during biostimulation.
Spatial Distribution of Geobacteraceae and Sulfate-Reducing Bacteria During In Situ Bioremediation of Uranium-Contaminated Groundwater
TLDR
Results demonstrate that, although Geobacter species must directly contact Fe( III) oxides in order to reduce them, cells do not firmly attach to the sediments, which is likely an adaptive response to sparsely and heterogeneously dispersed Fe(III) minerals in the subsurface.
Microbiological and Geochemical Heterogeneity in an In Situ Uranium Bioremediation Field Site
TLDR
The substantial microbial and geochemical heterogeneity at this site demonstrates that attempts should be made to deliver acetate in a more uniform manner and that closely spaced sampling intervals, horizontally and vertically, are necessary in order to obtain a more in-depth understanding of microbial processes and the relative contribution of attached and planktonic populations to in situ uranium bioremediation.
Enrichment of specific protozoan populations during in situ bioremediation of uranium-contaminated groundwater
The importance of bacteria in the anaerobic bioremediation of groundwater polluted with organic and/or metal contaminants is well recognized and in some instances so well understood that modeling of
In situ mobility of uranium in the presence of nitrate following sulfate-reducing conditions.
TLDR
The results of this field study confirmed those of previous laboratory studies which suggested that reoxidation of uranium under nitrate-reducing conditions can be substantially limited by preferential oxidation of reduced sulfur-bearing species.
Microbial reduction of uranium(VI) in sediments of different lithologies collected from Sellafield
Abstract The presence of uranium in groundwater at nuclear sites can be controlled by microbial processes. Here we describe the results from stimulating microbial reduction of U(VI) in sediment
BIOREMEDIATION OF URANIUM VIA GEOBACTER SPP
The in situ stimulated of Fe (III) oxide reduction by Geobacter bacteria tend towards the pollutant acceleration of U (VI) from groundwater. The biological mechanism behind this reaction has abided
Arsenic geochemistry in a biostimulated aquifer: an aqueous speciation study.
TLDR
Following acetate amendment at the site, elevated concentrations of arsenic in the groundwater were observed, and 4 additional thioarsenic species demonstrate a strong correlation between arsenic release and sulfide concentrations in groundwater, and their formation may explain the elevated total arsenic concentrations.
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