Filtration in Colloid Migration through Porous Media
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Groundwater colloids which adsorb actinide ions play an important role in actinide migration. The existence of colloids causes an effect of facilitating the migration, while it also causes a possibility of retardation of colloid transport due to filtration effect. The filtration phenomenon in porous media is dominated by deposition of colloidal particles onto stationary grain surfaces from flowing suspensions. The deposition behavior depends on the chemical characteristics of the particle surfaces and grain surfaces and on the solution chemistry, while the mechanisms of the behavior are not understood enough under the subsurface aquatic environment. In this study, we carried out column and batch experiments to investigate effects of flow field and deposited particles on the filtration behavior in porous media. We clarified the importance of the effects in quantifying the filtration effect in the migration of colloids through porous media.