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- W143676706 abstract "Microorganisms, either directly or indirectly, can alter the oxidation states of uranium and technetium resulting in their precipitation as sparingly soluble solid-phases. This process, in concept, can render these contaminants immobile for long time periods. {sup 99}Tc is a radionuclide that contributes significantly to estimates of future human health risk at the Hanford Site because of its longevity and mobility in the subsurface environment. It exists at high concentrations (up to 30,000 pCi/L) in the central areas of the site where the groundwater table is deep, and is predicted to move to the Columbia River within the next decade. It also has been observed at lower concentrations (600 pCi/L) in shallow groundwater near the river in the 100 H area. The purpose of this project is to assess the feasibility of stimulating the in situ subsurface microbiota at the Hanford Site to reduce and immobilize {sup 99}Tc. The concept and approach proposed has evolved from NABIR-funded research that is maturing to the point that it is now appropriate to pursue site-specific research to establish field-scale proof-of-concept. Although this project focuses on assessment of biostimulation approaches for reducing and immobilizing {sup 99}Tc in the shallow groundwater system of the 100 Hmore » area at the Hanford Site, it is anticipated that the information will be applicable to other contaminants and site conditions at Hanford, and possibly elsewhere, within the DOE weapons production complex. The initial objective of the project is to determine if indigenous microorganisms in aquifer sediments at Hanford can be stimulated to either directly or indirectly, via Fe(II), immobilize {sup 99}Tc. If this is shown to be the case, two additional objectives will be addressed: (1) Devise an electron donor addition strategy for stimulating indigenous microorganisms to immobilize {sup 99}Tc in situ, and (2) Evaluate the feasibility and develop a research plan including design parameters, if warranted, for an in situ biostimulation experiment at the Hanford Site.« less" @default.
- W143676706 created "2016-06-24" @default.
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- W143676706 date "2004-03-17" @default.
- W143676706 modified "2023-09-23" @default.
- W143676706 title "Assessing the Potential for In Situ Bioimmobilization of {sup 99}Tc at the Hanford Site" @default.
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