Experimental Study of Colloid Filtration by Compacted Bentonite
1996
In this study, the transport behavior of colloids through compacted
bentonite and sand-bentonite mixtures was investigated. Colloidal gold was
used to simulate mobile colloids because it was well characterized and its
dispersivity was controlled. The bentonite used was a sodium bentonite. The
sand-bentonite mixtures were prepared by mixing up to 50wt.% silica sand
with the bentonite. The bentonite and the sand-bentonite mixtures were
compacted to dry densities of 1000 and 1800 kg/m 3 and then
saturated with distilled water. The sand-bentonite mixture was also
saturated with synthetic sea-water. Column experiments were performed to
investigate colloidal transport. Further, colloidal particles stabilities in
high ionic strength water such as bentonite porewater or saline groundwater
were interpreted based on the repulsion potential from the double layer
force and the attraction potential from the van der Waals force. The results indicated that the colloidal particles were effectively filtered
by both the compacted bentonite and the sand-bentonite mixtures. This study
indicated that the effect of colloids on radionuclide transport in compacted
bentonite is negligible for the safety assessment of high level radioactive
waste (HLW) disposal.
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