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Abstract ▼ AI-Helper

We observed the interaction between uranium and dissimilatory metal-reducing bacteria which were obtained from underground of KURT (KAERI underground research tunnel). Additionally, we investigated an effect of iron-bearing minerals such as biotite and goethite onto microbial reduction and sorption ...

We observed the interaction between uranium and dissimilatory metal-reducing bacteria which were obtained from underground of KURT (KAERI underground research tunnel). Additionally, we investigated an effect of iron-bearing minerals such as biotite and goethite onto microbial reduction and sorption of uranium. The KURT bacteria were enriched using iron oxides (M1) and manganese oxides (M2) as electron acceptors, respectively. Shewanella putrefaciens was used as another bacterium to compare with the role of KURT bacteria. As biotite-bacteria-uranium coexisted, aqueous uranium was effectively reduced and removed by Shewanella and M2, but slowly decreased by M1. The reduced uranium was precipitated as an aggregated form of several nm particle size. In the case of goethite-bacteria-uranium interaction, most aqueous uranium was adsorbed onto goethite surface in the initial stage, but some iron and uranium were slowly dissolved from goethite by M1 respiration and their aqueous concentrations increased steadily. These phenomena by the M1 bioreduction for goethite caused a significant uranium desorption from goethite surface. By contrast, Shewanella, which is a dissimilatory ironreducing bacterium similar to M1 bacteria, did not make an increase of aqueous uranium concentration in the same condition. As a result, it seems that there may be lots of underground bacteria strongly interacting with some specific minerals, which would affect geochemical behaviors of dissolved radionuclides directly or indirectly.

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