Removal of selenate from sulfate-containing media by sulfate-reducing bacterial biofilms

Environmental Microbiology
Simon L Hockin, Geoffrey M Gadd

Abstract

A biofilm-selected strain of a Desulfomicrobium sp. removed selenate from solution to sub-micromolar concentrations during growth on lactate (or hydrogen) and sulfate. Under sulfate-limited growth conditions, selenium was enzymatically reduced to selenide. Under excess sulfate conditions, selenate removal was primarily by enzymatic reduction to elemental selenium. Sequestration by biofilms was greater under the latter condition. Experiments with washed cell suspensions showed that high sulfate concentrations inhibited cell-specific selenate reduction, but when growing cells were exposed to selenate, the biomass increase achieved during incubations with abundant sulfate resulted in more rapid selenate removal. The addition of small amounts of sulfite, or thiosulfate, ameliorated this inhibition. Nitrate also inhibited selenate reduction in washed cell suspensions, apparently due to a general oxidizing effect. These results suggest that where biofilm-based sulfate-reducing bacteria (SRB) bioreactors are considered for the treatment of mixed metalliferous wastes that contain selenium oxyanions, adequate selenate removal should be achievable under a range of environmental conditions. The form and fate of the precipitated product wi...Continue Reading

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Citations

Sep 27, 2008·The Science of the Total Environment·Markus Lenz, Piet N L Lens
Dec 19, 2009·Microbiology·Geoffrey Michael Gadd
May 28, 2014·Microbial Ecology·Anna V TugarovaAlexander A Kamnev
Mar 7, 2020·Isotopes in Environmental and Health Studies·Lichao XiaPhilip Larese-Casanova
Sep 16, 2006·Journal of Environmental Quality·Violeta AstratineiPiet Lens
Dec 21, 2018·The Science of the Total Environment·Xiaonan WangGeoffrey Michael Gadd
Jan 15, 2021·Applied Microbiology and Biotechnology·Frank Nkansah-BoaduSusan A Baldwin
Nov 16, 2020·Journal of Hazardous Materials·Louis-B JugniaBoris Tartakovsky
Dec 31, 2009·Environmental Science & Technology·Mirko PeitzschMichael Kersten
May 7, 2010·Environmental Science & Technology·Libbie L OramGregory Möller
Nov 6, 2008·Environmental Science & Technology·Markus LenzPiet N L Lens
Aug 17, 2021·Journal of Hazardous Materials·Jiaming XiongHongxia Liu

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