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Adsorption and Transport of Uranium(VI) in Subsurface Media

^a Dep. of Civil Engineering, 208 Harbert Engineering Center, Auburn Univ., Auburn, AL 36849-5337 USA
^b Environ. Sci. Div., Oak Ridge National Lab., P.O. Box 2008, Oak Ridge, TN 37831-6038 USA
^c Dep. of Agronomy, 104 Sturgis Hall, Louisiana State Univ., Baton Rouge, LA 70803 USA

View larger version (16K): [in a new window]   Fig. 1 Results of kinetic experiments: aqueous fraction as a function of time. Solid/solution ratio = 3.33 g/L in 0.01 M NaNO3 with log . For Oak Ridge (OR) and Savannah River (SR), , for Hanford (HF)

View larger version (19K): [in a new window]   Fig. 2 Adsorbed vs. aqueous concentration. Results determined from batch experiments with 3.33 g/L solid in 0.01 M NaNO3 with log . Solid and dotted lines denote the fitted isotherm(s): (a) Savannah (SR) and Hanford (HF); (b) Oak Ridge (OR)

View larger version (28K): [in a new window]   Fig. 3 Adsorption as a function of pH. Solid/solution ratio = 3.33 g/L in 0.1 M NaNO3 with log . Total system U(VI) is 1 mg/L

View larger version (27K): [in a new window]   Fig. 4 Speciation of 1 mg/L U(VI) and log total dissolved carbonate concentration (broken line) as a function of pH. Calculations made with MINTEQA2 (Allison et al., 1991) using the standard thermodynamic database and data from Grenthe (1992). Calculations made for an open system with log PCO2 = -3.5 in 0.1 M NaNO3

View larger version (25K): [in a new window]   Fig. 5 Observed and model calculated breakthrough curves for U(VI) in Savannah River (SR) column. C0 = 5.0 mg/L, pH = 4.1 in 0.01 M NaNO3 with log PCO2 = -3.5. NLE, nonlinear equilibrium; NLE-FOK, nonlinear equilibrium, first-order kinetic; FOK, first-order kinetic (not shown for clarity); FRK, fractional order kinetic

View larger version (29K): [in a new window]   Fig. 6 Observed and model calculated breakthrough curves for U(VI) in Oak Ridge (OR) column. C0 = 5.0 mg/L, pH = 4.7 in 0.01 M NaNO3 with log PCO2 = -3.5. NLE, nonlinear equilibrium; NLE-FOK, nonlinear equilibrium, first-order kinetic; FOK, first-order kinetic (not shown for clarity); FRK, fractional order kinetic. NLE-1, -2, and -4 (-3 not shown for clarity) indicate the isotherm from which the adsorption constants were taken

View larger version (27K): [in a new window]   Fig. 7 Observed and model calculated breakthrough curves for U(VI) in Hanford (HF) column. C0 = 0.29 mg/L, pH = 6.8 in 0.01 M NaNO3 with log PCO2 = -3.5. NLE, nonlinear equilibrium; NLE-FOK, nonlinear equilibrium, first-order kinetic; FOK, first-order kinetic (not shown for clarity); FRK, fractional order kinetic