Microbial community dynamics in uranium contaminated subsurface sediments under biostimulated conditions with high nitrate and nickel pressure.

Environmental Science and Pollution Research International
David MoreelsDaniel van der Lelie

Abstract

The subsurface at the Oak Ridge Field Research Center represents an extreme and diverse geochemical environment that places different stresses on the endogenous microbial communities, including low pH, elevated nitrate concentrations, and the occurrence of heavy metals and radionuclides, including hexavalent uranium [U(VI)]. The in situ immobilization of U(VI) in the aquifer can be achieved through microbial reduction to relatively insoluble U(IV). However, a high redox potential due to the presence of nitrate and the toxicity of heavy metals will impede this process. Our aim is to test biostimulation of the endogenous microbial communities to improve nitrate reduction and subsequent U(VI) reduction under conditions of elevated heavy metals. Column experiments were used to test the possibility of using biostimulation via the addition of ethanol as a carbon source to improve nitrate reduction in the presence of elevated aqueous nickel. We subsequently analyzed the composition of the microbial communities that became established and their potential for U(VI) reduction and its in situ immobilization. Phylogenetic analysis revealed that the microbial population changed from heavy metal sensitive members of the actinobacteria, alpha...Continue Reading

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Citations

Apr 1, 2009·Environmental Science and Pollution Research International·Sardar KhanJi-Zheng He
Sep 17, 2013·The Journal of Microbiology·Nurul H KhanDarren R Korber
Sep 20, 2012·Environmental Technology·Kelly ChoSonia M Tiquia
Apr 7, 2010·Applied and Environmental Microbiology·Jana SitteKirsten Küsel
Nov 30, 2010·Journal of Hazardous Materials·Sangeeta Choudhary, Pinaki Sar
Nov 20, 2015·Frontiers in Microbiology·Christopher L HemmeJizhong Zhou
May 29, 2018·Environmental Science and Pollution Research International·Jinchuan XieXiaohua Zhou
Nov 26, 2009·Environmental Science & Technology·Edward PeltierDonald L Sparks
Dec 5, 2009·Environmental Science & Technology·Shelly D KellyKenneth M Kemner

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