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Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides
Yi Zhengji
2010
Source PublicationJournal of Environmental Radioactivity
Volume101Issue:9Pages:700-705
AbstractMicrobiological reduction of uranyl by sulfate reducing bacteria (SRB) has been proposed as a promising method for removal of radionuclide from groundwater. In this study, we examined the effect of two naturally occurring Fe(III) (hydr)oxides, hematite and goethite, on the bioreduction of U(VI) by a mixed culture of SRB via laboratory batch experiments. The biogenic precipitate from U(VI) bioreduction was determined using X-ray absorption near edge structure (XANES) analysis, showing a typical feature of uraninite (UO2). In the presence of either hematite or goethite-containing Fe(III) ranging from 10 to 30 mM, the reduction of U(VI) was retarded by both minerals and the retardatory effect was enhanced with increasing amount of Fe(III) (hydr)oxide. When exposed to a mixture of hematite and goethite with the total Fe(III) kept constant at 20 mM, the retardatory effect on U(VI) reduction by the minerals were directly correlated with the fraction of hematite present. A slow increase in U(VI) concentration was also found in all Fe(III) (hydr)oxide treatments after 10–13 days, accompanied by the release of Fe(II) into the solution. The presence of Fe(III) (hydr)oxide can cause the eventual incomplete bioreduction of U(VI). However, it was not the case for the control without minerals. When mixing biogenic uraninite with hematite or goethite without SRB, Fe(II) was also detected in the solution. These findings suggest that the U(VI) remobilization after 10~13 days may be due to reoxidation of the uraninite by the solid-phase Fe(III) (hydr)oxide.
KeywordUranium Sulfate Reducing Bacteria (Srb) Hematite Goethite Uraninite
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6850
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Yi Zhengji. Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides[J]. Journal of Environmental Radioactivity,2010,101(9):700-705.
APA Yi Zhengji.(2010).Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides.Journal of Environmental Radioactivity,101(9),700-705.
MLA Yi Zhengji."Microbial removal of uranyl by sulfate reducing bacteria in the presence of Fe (III) (hydr)oxides".Journal of Environmental Radioactivity 101.9(2010):700-705.
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