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Independent and synergistic bio-reductions of uranium (VI) driven by zerovalent iron in aquifer by Jianping Lu; Baogang Zhang; Rongyue Geng; Guoxi Lian; Hailiang Dong is a Environmental Science article available to read on EtoBox.

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Zerovalent iron [Fe(0)] can donate electron for bioprocess, but microbial uranium (VI) [U(VI)] reduction driven by Fe(0) is still poorly understood. In this study, Fe(0) supported U(VI) bio-reduction was steadily achieved in the 160-d continuous-flow biological column. The maximum removal efficiency and capacity of U(VI) were 100% and 46.4 ± 0.52 g/(m 3 ⋅d) respectively, and the longevity of Fe(0) increased by 3.09 times. U(VI) was reduced to solid UO 2 , while Fe(0) was finally oxidized to Fe(III). Autotrophic Thiobacillus achieved U(VI) reduction coupled to Fe(0) oxidation, verified by pure culture. H 2 produced from Fe(0) corrosion was consumed by autotrophic Clostridium for U(VI) reduction. The detected residual organic intermediates were biosynthesized with energy released from Fe(0) oxidation and utilized by heterotrophic Desulfomicrobium, Bacillus and Pseudomonas to reduce U(VI). Metagenomic analysis found the upregulated genes for U(VI) reduction (e.g., dsrA and dsrB) and Fe(II) oxidation (e.g., CYC1 and mtrA). These functional genes were also transcriptionally expressed. Cytochrome c and glutathione responsible for electron transfer also contributed to U(VI) reduction. Thi

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Author

Jianping Lu; Baogang Zhang; Rongyue Geng; Guoxi Lian; Hailiang Dong

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)