Physicochemical heterogeneity controls on uranium bioreduction rates at the field scale

Environmental Science & Technology
Li LiSusan S Hubbard

Abstract

It has been demonstrated in laboratory systems that U(VI) can be reduced to immobile U(IV) by bacteria in natural environments. The ultimate efficacy of bioreduction at the field scale, however, is often challenging to quantify and depends on site characteristics. In this work, uranium bioreduction rates at the field scale are quantified, for the first time, using an integrated approach. The approach combines field data, inverse and forward hydrological and reactive transport modeling, and quantification of reduction rates at different spatial scales. The approach is used to explore the impact of local scale (tens of centimeters) parameters and processes on field scale (tens of meters) system responses to biostimulation treatments and the controls of physicochemical heterogeneity on bioreduction rates. Using the biostimulation experiments at the Department of Energy Old Rifle site, our results show that the spatial distribution of hydraulic conductivity and solid phase mineral (Fe(III)) play a critical role in determining the field-scale bioreduction rates. Due to the dependence on Fe-reducing bacteria, field-scale U(VI) bioreduction rates were found to be largely controlled by the abundance of Fe(III) minerals at the vicinity ...Continue Reading

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Citations

Mar 20, 2012·Environmental Science & Technology·Evan FryeSeth Blumsack
Jun 27, 2012·Environmental Science & Technology·Carolyn I PearceJohn M Zachara
Mar 15, 2013·Environmental Science & Technology·Changyong ZhangZhi Shi
Feb 6, 2016·Environmental Science & Technology·John M ZacharaAndrew G Stack
Oct 7, 2014·Frontiers in Microbiology·Christopher G HubbardMark E Conrad
May 5, 2016·The Science of the Total Environment·Amy KenwellKenneth H Williams
Mar 10, 2015·The Career Development Quarterly·Angela Byars-Winston

Related Concepts

Bioremediation
Ferric Compounds
Uranium
Sediments, Marine
Environment
Laboratory
Minerals
Obstetrics Department
Spatial Distribution
Uranium

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