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Experimental Study of Colloid Filtration by CompactedBentonite

Published online by Cambridge University Press:  03 September 2012

Susumu Kurosawa,
Mikazu Yui and
Hideki Yoshikawa
Susumu Kurosawa
Affiliation:
Naka Energy Research Center, Mitsubishi Materials Corporation, 1002–14 Mukouyama, Naka-machi, Naka-gun, Ibaraki-ken, 311–01, Japan
Mikazu Yui
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-ken, 319–11, Japan
Hideki Yoshikawa
Affiliation:
Power Reactor and Nuclear Fuel Development Corporation, 4–33 Muramatsu, Tokai-mura, Naka-gun, Ibaraki-ken, 319–11, Japan
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Abstract

In this study, the transport behavior of colloids through compactedbentonite and sand-bentonite mixtures was investigated. Colloidal gold wasused to simulate mobile colloids because it was well characterized and itsdispersivity was controlled. The bentonite used was a sodium bentonite. Thesand-bentonite mixtures were prepared by mixing up to 50wt.% silica sandwith the bentonite. The bentonite and the sand-bentonite mixtures werecompacted to dry densities of 1000 and 1800 kg/m3 and thensaturated with distilled water. The sand-bentonite mixture was alsosaturated with synthetic sea-water. Column experiments were performed toinvestigate colloidal transport. Further, colloidal particles stabilities inhigh ionic strength water such as bentonite porewater or saline groundwaterwere interpreted based on the repulsion potential from the double layerforce and the attraction potential from the van der Waals force.

The results indicated that the colloidal particles were effectively filteredby both the compacted bentonite and the sand-bentonite mixtures. This studyindicated that the effect of colloids on radionuclide transport in compactedbentonite is negligible for the safety assessment of high level radioactivewaste (HLW) disposal.

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References

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