Step-input injections of a suspension of kaolinite particles in a column filled with sand were performed. Different flow velocities were investigated. Samples were collected in the effluent for particle size analysis. Following each experiment, the spatial size distribution of the retained particles in the medium was analyzed. The results show that the recovery rate increases, and therefore the collector efficiency decreases, when the flow velocity increases. The longitudinal dispersion increases with the flow velocity following a power law. Particle size analysis of the effluent showed that large particles are the first to be recovered at the porous medium outlet. The sizes of the recovered particles increase with Darcian velocity. The spatial distribution of the retained particles shows that the coarser particles are mainly deposited at the entrance of the porous medium, and a strong decrease in the median diameter with depth was observed.
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