Physical Chemistry of Wastes in Soil
Tailings from the acid-leach processing of uranium ore pose a low-level
radioactive waste disposal problem due to the extremely acidic nature of
the waste and its radium and radon content. Of primary geotechnical
interest is the transport and fate of radium in seepage from the
tailing impoundments. Ideally, we desire a hydrogeochemical model
amenable for use as a predictive tool for analysis of the long-term
transport of radium and for disposal site selection. In order to
develop such a model, an understanding of the precipitation-dissolution and
adsorption-desorption behavior of the radium in the waste and the
variety of geologic materials present is required. These
physico-chemical aspects of uranium mill tailings, and of the ore that
leads to such wastes such as phosphogypsum and bauxite muds, are under
study at Northwestern.
Related Publications by Barbara-Ann G. Lewis
Coupling of Equilibrium Chemistry to the Transport of Radionuclides in
Contaminated Soil. 1993. In Hydrogeologic Investigations and
Monitoring: Groundwater Modeling. Y. Eckstein and A. Zaporozec,
eds., AIH, Water Environment Federation, pp. 333-344 (With E.
Application of Soil Physical, Chemical, and Bioassay Methods to Coal
Refuse. 1993. ASTM STP 1162:5-22, American Society for Testing and
Materials (With M.M. MacDonell and N. Gnanapragasam).
Surfactant Flooding of Diesel-Fuel Contaminated Soil. 1992. In
Environmental Remediation. Vandegrift, G.F. et al. eds. ACS
Sympos. Ser. 509. American Chemical Society (With R. Peters, C.D.
Montemagno, and L. Shem).
Distribution of Uranium and Thorium in Different Geochemical Phases of Three Contaminated
Soils. 1990. Proc. Nuclear and Hazardous Waste Management International Topic
Meeting, Knoxville, TN, Sept. 30-Oct. 4. American Nuclear Society (With Y.Y.
Wang and C. Yu).
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For more information contact:
Dr. Barbara-Ann G. Lewis