Immobilization of selenite via two parallel pathways during in situ bioremediation

Environmental Science & Technology
Youneng TangAlbert J Valocchi

Abstract

It is widely understood that selenite can be biologically reduced to elemental selenium. Limited studies have shown that selenite can also be immobilized through abiotic precipitation with sulfide, a product of biological sulfate reduction. We demonstrate that both pathways significantly contribute to selenite immobilization in a microfluidic flow cell having a transverse mixing zone between propionate and selenite that mimics the reaction zone along the margins of a selenite plume undergoing bioremediation in the presence of background sulfate. The experiment showed that red particles of amorphous elemental selenium precipitate on the selenite-rich side of the mixing zone, while long crystals of selenium sulfides precipitate on the propionate-rich side of the mixing zone. We developed a continuum-scale reactive transport model that includes both pathways. The simulated results are consistent with the experimental results, and indicate that spatial segregation of the two selenium precipitates is due to the segregation of the more thermodynamic favorable selenite reduction and the less thermodynamically favorable sulfate reduction. The improved understanding of selenite immobilization and the improved model can help to better de...Continue Reading

References

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Oct 12, 2012·Biotechnology and Bioengineering·Youneng TangBruce E Rittmann

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Citations

Mar 23, 2017·Biotechnology and Bioengineering·Youneng Tang, Haihu Liu
Aug 17, 2021·Journal of Hazardous Materials·Jiaming XiongHongxia Liu

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