Mineral transformation and biomass accumulation associated with uranium bioremediation at Rifle, Colorado

Li Li, Carl I. Steefel, Kenneth H. Williams, Michael J. Wilkins, Susan S. Hubbard

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)5429-5435
Number of pages7
JournalEnvironmental Science and Technology
Volume43
Issue number14
DOIs
StatePublished - Jul 15 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

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