Experimental study on reduction of U (VI) by an anaerobic bacterium, <Emphasis Type="Italic">Shewanella putrefaciens</Emphasis>: Application to sandstone-hosted interlayer oxidation-zone type uranium deposits,China |
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| Authors: | Maozhong Min Huifang Xu L L Barton Xinjian Peng Lin Yin Rucheng Wang |
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| Institution: | (1) Department of Earth Sciences, State Key Laboratory of Mineral Deposit Research, Nanjing University, 210093 Nanjing, China;(2) Department of Earth and Planetary Sciences, University of New Mexico, 87131-1116 Albuquerque, NM, USA;(3) Department of Biology, University of New Mexico, 87131-1116 Albuquerque NM, USA |
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| Abstract: | An experimental study on reduction of U (VI) by anaerobic bacteria, Shewanella putrefaciens, is first reported here in China. The experimental conditions were: 35°C and pH= 7.0-7.4, corresponding to a physicochemical
environments in which the sandstone-hosted interlayer oxidation-zone type uranium deposit formed in Northwest China’s Xinjiang.
Bacteria adopted in the present experiment, Shewanella putrefaciens, occur extensively in natural environment. Our study shows that nano-crystal precipitates of uraninite quickly occurred on
the surface of the cells within one week. It was found that the pitchblende was characterized by a random arrangement of uraninite
nanocrystals (2-4 nm) in it, significantly different from natural pitchblende in which uraninite nanocrystals are arranged
in order. Finally, a possible mechanism of uranium biomineralization by microorganisms in the deposits is discussed. Our investigation
may supply a technical train of thoughts for bioremediation of nuclear-contaminated water environments and for underground
dissolving extraction of the sandstone-hosted uranium ores. |
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| Keywords: | anaerobic bacteria reduction pitchblende sandstone-hosted uranium deposit experimental study |
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