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Bioreduction of U(VI) in groundwater under anoxic conditions from a decommissioned in situ leaching uranium mine

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Abstract

To determine whether the U(VI) in groundwater under anoxic conditions at a decommissioned in situ leaching (ISL) uranium mine could be bioreduced, groundwater samples containing suspended sediments were taken from the mine, experimental setup was fabricated, and the jar containing the groundwater in the setup was amended with ethanol and incubated under anoxic conditions. The variations of pH, chemical oxygen demand, nitrate, sulfate, U(VI), and dissolved oxygen (DO) concentrations were monitored during the incubation. U(VI) concentration dropped to 0.043 mg/L when the stimulated microorganisms were active, and it then increased to 0.835 mg/L within 10 days after the metabolism of the stimulated microorganisms was inhibited. The DO variation was observed in the amended jar during the incubation, and the metabolism of the stimulated microorganisms was found to affect the DO concentration. Firmicutes were found to be dominant in the sediments in the amended jar through the 16S rRNA pyrosequencing. The results indicate that it is possible to bioreduce U(VI) in the groundwater under anoxic conditions at the decommissioned ISL uranium mine by adding carbon source into it without removing the oxygen from it.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51274124) and the Development Program for Science and Technology for National Defense (B3720132001).

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  1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, 28 West Changsheng Road, Hengyang, 421001, Hunan, People’s Republic of China

    De-xin Ding, Shi-mi Li, Nan Hu, Fei Xu, Guang-yue Li & Yong-dong Wang

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  1. De-xin Ding
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Correspondence to De-xin Ding.

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Ding, Dx., Li, Sm., Hu, N. et al. Bioreduction of U(VI) in groundwater under anoxic conditions from a decommissioned in situ leaching uranium mine . Bioprocess Biosyst Eng 38, 661–669 (2015). https://doi.org/10.1007/s00449-014-1305-3

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