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Published on: June 21, 2015
Mechanism of uranium (VI) removal by two anaerobic bacterial communities
Mónica Martins1, Maria Leonor Faleiro2, Ana M Rosa da Costa3
1Centro de Ciências do Mar, Universidade do Algarve, FCT-DQF (edifício 8), Campus de Gambelas, 8005-139 Faro, Portugal.
Abstract:
The mechanism of uranium (VI) removal by two anaerobic bacterial consortia, recovered from an uncontaminated site (consortium A) and other from an uranium mine (consortium U), was investigated. The highest efficiency of U (VI) removal by both consortia (97%) occurred at room temperature and at pH 7.2. Furthermore, it was found that U (VI) removal by consortium A occurred by enzymatic reduction and bioaccumulation, while the enzymatic process was the only mechanism involved in metal removal by consortium U. FTIR analysis suggested that after U (VI) reduction, U (IV) could be bound to carboxyl, phosphate and amide groups of bacterial cells. Phylogenetic analysis of 16S rRNA showed that community A was mainly composed by bacteria closely related to Sporotalea genus and Rhodocyclaceae family, while community U was mainly composed by bacteria related to Clostridium genus and Rhodocyclaceae family.
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