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Bioremediation Field Experiment Successfully Removes Uranium from Contaminated Ground Water
Published: October 30, 2002
Posted: November 18, 2002

Researchers in the Natural and Accelerated Bioremediation Research (NABIR) program have demonstrated that a novel bioremediation strategy precipitates uranium from ground water at a Uranium Mill Tailings Remedial Action (UMTRA) site in Rifle, Colorado. Until now, there have been no cost-effective mechanisms for preventing uranium contamination from migrating with ground water and threatening important water resources. Researchers from the University of Massachusetts discovered that microorganisms from the genus Geobacter effectively strip uranium from contaminated ground water by transferring electrons onto uranium. This electron transfer process converts soluble uranium to an insoluble form that precipitates from the ground water. To stimulate the activity of Geobacter at the Old Rifle site, an interdisciplinary team of researchers from the University of Massachusetts, the Pacific Northwest National Laboratory, and the UMTRA program added a dilute solution of acetate (i.e. vinegar) to the ground water. From mid-June through mid-August, more than 70% of the uranium was precipitated from the ground water within the treatment zone. In some areas, uranium concentrations were below UMTRAs maximum contaminant level (MCL) of 0.044mg/L. The Geobacter species responsible for uranium removal at the Old Rifle site is also being investigated in the Genomes to Life Program to better understand the mechanisms by which Geobacter transforms radionuclides such as uranium.

Contact: Paul Bayer, SC-75, (301) 903-5324 and Anna Palmisano, SC-75, (301) 903-9963
Topic Areas:

  • Research Area: Subsurface Biogeochemical Research
  • Research Area: Microbes and Communities

Division: SC-33.1 Earth and Environmental Sciences Division, BER
      (formerly SC-75 Environmental Remediation Sciences Division, OBER)


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