TY - GEN
T1 - Diffusion of cesium in compacted bentonite with different column lengths
AU - Lee, Chuan Pin
AU - Wu, Ming Chee
AU - Liu, Ching Yuan
AU - Pan, Chun Hua
AU - Tsai, Tsuey Lin
AU - Wei, Hwa Jou
AU - Men, Lee Chung
PY - 2013
Y1 - 2013
N2 - In this study, diffusion behavior of cesium(Cs) with a concentration of 0.1 mM in bentonite (MX80) was investigated using through-diffusion methods with various lengths (0.5, 0.75, 2.0, 2.5 cm), respectively. Additionally, a non-reactive tracer (HTO) was conducted to characterize the physical process in compacted MX80 before cesium. Figure 1 shows that the diffusion process of Cs in synthetic seawater (SW) and groundwater (GW) reached equilibrium after 250 and 500 days, respectively. It addition, it also shows results that indicate that the distribution coefficients (Kd) of Cs in GW are higher than those in SW, which is in agreement with results obtained from the batch method. In fact, it clarifies further that the major sorption mechanism of Cs is ion exchange and that ionic strength (I) is the major factor affecting Cs retardation. The retardation factors (Rfs) of Cs were valued in a 1-D diffusion hypothesis, and Rfs of higher length and diameter (L/D) ratios appeared to be smaller values than those found in smaller L/Ds. This discrepancy might be explained by the difference in the soil/liquid ratio, and it can be taken as another parameter influencing different Kd values. Considering the dependency of the soil/liquid ratio on the Kd, a higher solid/liquid ratio applied in the experiments provided more realistic Kd values in a real geological environment.
AB - In this study, diffusion behavior of cesium(Cs) with a concentration of 0.1 mM in bentonite (MX80) was investigated using through-diffusion methods with various lengths (0.5, 0.75, 2.0, 2.5 cm), respectively. Additionally, a non-reactive tracer (HTO) was conducted to characterize the physical process in compacted MX80 before cesium. Figure 1 shows that the diffusion process of Cs in synthetic seawater (SW) and groundwater (GW) reached equilibrium after 250 and 500 days, respectively. It addition, it also shows results that indicate that the distribution coefficients (Kd) of Cs in GW are higher than those in SW, which is in agreement with results obtained from the batch method. In fact, it clarifies further that the major sorption mechanism of Cs is ion exchange and that ionic strength (I) is the major factor affecting Cs retardation. The retardation factors (Rfs) of Cs were valued in a 1-D diffusion hypothesis, and Rfs of higher length and diameter (L/D) ratios appeared to be smaller values than those found in smaller L/Ds. This discrepancy might be explained by the difference in the soil/liquid ratio, and it can be taken as another parameter influencing different Kd values. Considering the dependency of the soil/liquid ratio on the Kd, a higher solid/liquid ratio applied in the experiments provided more realistic Kd values in a real geological environment.
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M3 - Conference contribution
AN - SCOPUS:84886915872
SN - 9781627486446
T3 - 14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal
SP - 947
EP - 953
BT - 14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013
T2 - 14th International High-Level Radioactive Waste Management Conference: Integrating Storage, Transportation, and Disposal, IHLRWMC 2013
Y2 - 28 April 2013 through 2 May 2013
ER -