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Related Experiment Videos

Uranium immobilization by sulfate-reducing biofilms.

Haluk Beyenal1, Rajesh K Sani, Brent M Peyton

  • 1Center for Biofilm Engineering and Department of Civil Engineering, Montana State University, Bozeman, Montana 59717-3980, USA.

Environmental Science & Technology
|April 29, 2004
PubMed
Summary
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Sulfate-reducing bacteria biofilms effectively immobilized hexavalent uranium (U(VI)), removing 88-96% from solution. Uranium was immobilized through enzymatic and chemical reactions, forming uraninite precipitate.

Area of Science:

  • Environmental Microbiology
  • Biogeochemistry
  • Microbial Remediation

Background:

  • Hexavalent uranium (U(VI)) poses environmental risks due to its mobility and toxicity.
  • Sulfate-reducing bacteria (SRB) are known to precipitate heavy metals.
  • Understanding uranium immobilization mechanisms by SRB biofilms is crucial for bioremediation strategies.

Purpose of the Study:

  • To investigate the immobilization of U(VI) by Desulfovibrio desulfuricans G20 biofilms.
  • To quantify the dynamics of uranium removal and precipitation within SRB biofilms.
  • To elucidate the mechanisms of U(VI) immobilization, including enzymatic and chemical processes.

Main Methods:

  • Cultivation of SRB biofilms in continuous-flow reactors.
  • Monitoring of U(VI) concentration in the effluent over 32 weeks.

Related Experiment Videos

  • Measurement of microbial activity via hydrogen sulfide (H2S) production using microelectrodes.
  • Characterization of immobilized uranium using X-ray absorption near edge structure (XANES) spectroscopy and transmission electron microscopy (TEM).

    • Main Results:

    • SRB biofilms achieved 88-96% removal of U(VI) from the solution.
    • Uranium immobilization occurred through both enzymatic and chemical reactions with microbially produced H2S.
    • A black precipitate, identified as uraninite (a U(IV) mineral), was formed within the biofilms.
    • XANES and TEM analyses confirmed the reduction of U(VI) to U(IV) and the formation of uraninite.

    Conclusions:

    • Desulfovibrio desulfuricans G20 biofilms are effective in immobilizing U(VI) from aqueous solutions.
    • Microbially generated sulfide plays a key role in both the reduction and precipitation of uranium.
    • The formation of uraninite indicates a stable mineral phase for sequestered uranium, relevant for bioremediation applications.