The present situation and future prospects of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan

A new method of evaluating colloid diffusion and filtration in compacted bentonites using dendrimers was developed. Polyamidoamine (PAMAM) dendrimers with sizes of 5.7 and 7.2 nm were chosen as diffusion probes owing to their high monodispersity and well-defined molecular structure. The diffusion and filtration behaviors were investigated by a through-diffusion experiment in bentonite compacted to 0.8 Mg/m 3 and saturated with 0.005-0.5 mol/L NaCl. The breakthrough curves were observed under all conditions, demonstrating that dendrimers could diffuse through the pore network in compacted bentonite. The effective diffusivity (D e ) and filtration ratio (R f ) of dendrimers were determined from the breakthrough curves and the depth profiles in compacted bentonite, respectively.The D e values of the negatively charged dendrimers increased when porewater salinity increased and dendrimer size decreased owing to the anion exclusion effect on negatively charged clay surfaces. The R f values increased when porewater salinity decreased and dendrimer size increased, demonstrating that significant fractions of dendrimers were filtered by the narrow pores in the complex pore networks. The results of this study confirm the validity of the evaluation method using dendrimers and the importance of the need for further investigation under various conditions to understand the factors controlling colloid diffusion and filtration and their relationships with the microstructure in compacted bentonite.

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Development of evaluation method for diffusion and filtration behavior of colloid in compacted bentonites using dendrimers

Endo

Tachi

Ishidera

et al. 2021

Transactions of the Atomic Energy Society of Japan

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The present situation and future prospects of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan

Abstract: This paper shows a current status of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan, and summarizes realistic approach of the colloids studies at a substantial research network for Japanese universities and institutes.

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Development of evaluation method for diffusion and filtration behavior of colloid in compacted bentonites using dendrimers

Development of evaluation method for diffusion and filtration behavior of colloid in compacted bentonites using dendrimers

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