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| - Fate of Selenate Metabolized by Enterobacter taylorae Isolatedfrom Rice Straw
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| - Rice straw has been successfully tested as an effective organic source and a carrier of selenate[Se(VI)]-reducing bacteria to remove Se(VI) from agricultural drainage water. In this study, an Se(VI)-reducing bacterium identified as Enterobacter taylorae was isolated from rice straw and used toremove Se(VI) from a 0.5% tryptic soy broth (TSB) and high-salt (15.5 dS m-1) synthetic agriculturaldrainage water containing Se(VI) in a range of 500−5000 μg/L. Results showed that E. tayloraereduced 81−94% of the added Se(VI) to elemental Se [Se(0)] in the 0.5% TSB solution during a5-day experiment. In the high-salt drainage water, Se(VI) reduction was rapid during a 9-dayexperiment. On the final day of the experiment, Se(0) [75%] and Se(−II) [19%] were the major formsof Se in the drainage water with small amounts of Se(VI), Se(IV), and volatile Se released. Thepathway of Se(VI) reduction in the drainage water followed the order Se(VI) → selenite [Se(IV)] →Se(0) → selenide [Se(−II)]. This study suggests that E. taylorae may be used to remediate high-saltSe(VI)-contaminated agricultural drainage water. Keywords: Agricultural drainage water; bioremediation; elemental selenium; Enterobacter taylorae;selenate; selenium speciation
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