Uranium transport in a crushed granodiorite: experiments and reactive transport modeling

Journal of Contaminant Hydrology
T M Dittrich, Paul W Reimus

Abstract

The primary objective of this study was to develop and demonstrate an experimental method to refine and better parameterize process models for reactive contaminant transport in aqueous subsurface environments and to reduce conservatism in such models without attempting to fully describe the geochemical system. Uranium was used as an example of a moderately adsorbing contaminant because of its relevance in geologic disposal of spent nuclear fuel. A fractured granodiorite from the Grimsel Test Site (GTS) in Switzerland was selected because this system has been studied extensively and field experiments have been conducted with radionuclides including uranium. We evaluated the role of pH, porous media size fraction, and flow interruptions on uranium transport. Rock cores drilled from the GTS were shipped to Los Alamos National Laboratory, characterized by x-ray diffraction and optical microscopy, and used in uranium batch sorption and column breakthrough experiments. A synthetic water was prepared that represented the porewater that would be present after groundwater interacts with bentonite backfill material near a nuclear waste package. Uranium was conservatively transported at pH8.8. Significant adsorption and subsequent desorpt...Continue Reading

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May 29, 2014·Environmental Science & Technology·Wenming Dong, Jiamin Wan

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Citations

Oct 4, 2015·Journal of Environmental Management·Timothy M Dittrich, Paul W Reimus
Jul 18, 2015·Journal of Environmental Radioactivity·Timothy Mark DittrichPaul William Reimus
Nov 21, 2019·Environmental Science and Pollution Research International·Haiying FuYongdong Wang
May 19, 2018·Journal of Environmental Radioactivity·H P EmersonT M Dittrich
Jul 30, 2019·Water Research·Emily L TranNoam Weisbrod

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