Uranium-Eating Bacteria: A Potential Solution to Nuclear Contamination
The discovery of uranium-eating bacteria in contaminated mine water at the Wismut GmbH Schlema-Alberoda operation in Germany has sparked excitement among scientists and environmentalists alike. This finding could potentially revolutionize the way we approach radioactive contamination, offering a natural and cost-effective solution.
The bacteria, found in the uranium-laden mine water, have the remarkable ability to stabilize uranium under certain conditions. This discovery, led by microbiologists and resource ecologists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) in Germany and the University of Granada in Spain, was published in the journal Nature Communications.
The research revealed that bacteria supplied with glycerol as a carbon source can convert toxic uranium dissolved in water into a stable chemical compound. This process, known as pentavalent uranium formation, changes the way uranium bonds to other elements, making it easier to 'lock up' within stable minerals. The bacteria had incorporated the uranium into their cell walls, with an unusually high proportion of pentavalent uranium, which more readily formed FeU(V)O4, a compound that scientists were already aware of but had not previously known could form in nature.
The implications of this discovery are far-reaching. Radioactive uranium contamination is a global problem, with surface water and groundwater in the United States, India, Canada, France, South Africa, and Australia sometimes exceeding the 0.03 milligram per liter guidelines for uranium contamination. Bioremediation, a cost-effective alternative to physico-chemical water treatment, has already shown substantial uranium reduction in field studies, avoiding the generation of secondary sludge.
However, as microbiologist Evelyn Krawczyk-Bärsch points out, further investigation is needed to determine the extent to which bacteria can help render uranium harmless for remediation purposes. The authors conclude that, although derived from a single geochemical scenario, the processes identified are broadly applicable to other contaminated waters.
This discovery raises a deeper question: could bacteria be part of the solution to our nuclear waste problem? With further research, we may find that these uranium-eating bacteria could be an ally in our quest to clean up nuclear contamination, not just in Germany, but across the world.
