Uranium removal from groundwater via in situ biostimulation: Field-scale modeling of transport and biological processes

Steven B. Yabusaki, Yilin Fang, Philip E. Long, Charles T. Resch, Aaron D. Peacock, John Komlos, Peter R. Jaffe, Stan J. Morrison, Richard D. Dayvault, David C. White, Robert T. Anderson

Research output: Contribution to journalArticle

118 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)216-235
Number of pages20
JournalJournal of Contaminant Hydrology
Volume93
Issue number1-4
DOIs
StatePublished - Aug 15 2007

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Water Science and Technology

Keywords

  • Bioremediation
  • Biostimulation
  • Field experiment
  • Iron
  • Reactive transport
  • Sulfate
  • Uranium

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