TY  - JOUR
AU  - Yabusaki, S. B.
AU  - Fang, Y.
AU  - Long, P. E.
AU  - Resch, C. T.
AU  - Peacock, A. D.
AU  - Komlos, J.
AU  - Jaffe, P. R.
AU  - Morrison, S. J.
AU  - Dayvault, R. D.
AU  - White, D. C.
AU  - Anderson, R. T.
PY  - 2007//
TI  - Uranium removal from groundwater via in situ biostimulation: Field-scale modeling of transport and biological processes
JO  - Journal of Contaminant Hydrology
SP  - 216
EP  - 235
VL  - 93
IS  - 1
KW  - Bioremediation
KW  - Biostimulation
KW  - Field experiment
KW  - Iron
KW  - Reactive transport
KW  - Sulfate
KW  - Uranium
N2  - During 2002 and 2003, bioremediation experiments in the unconfined aquifer of the Old Rifle UMTRA field site in western Colorado provided evidence for the immobilization of hexavalent uranium in groundwater by iron-reducing Geobacter sp. stimulated by acetate amendment. As the bioavailable Fe(III) terminal electron acceptor was depleted in the zone just downgradient of the acetate injection gallery, sulfate-reducing organisms came to dominate the microbial community. In the present study, we use multicomponent reactive transport modeling to analyze data from the 2002 field experiment to identify the dominant transport and biological processes controlling uranium mobility during biostimulation, and determine field-scale parameters for these modeled processes. The coupled process simulation approach was able to establish a quantitative characterization of the principal flow, transport, and reaction processes based on the 2002 field experiment, that could be applied without modification to describe the 2003 field experiment. Insights gained from this analysis include field-scale estimates of the bioavailable Fe(III) mineral threshold for the onset of sulfate reduction, and rates for the Fe(III), U(VI), and sulfate terminal electron accepting processes.
SN  - 0169-7722
UR  - https://www.sciencedirect.com/science/article/pii/S016977220700037X
N1  - exported from refbase (http://www.uhydro.de/base/show.php?record=156), last updated on Fri, 26 Jan 2024 13:19:04 +0100
ID  - Yabusaki_etal2007
ER  -