Effect of flow field on colloid deposition in filtration process of polystyrene latex particles through columns packed with glass beads

The effect of flow field on the deposition rate of colloidal particles onto solid surface in a column packed with spherical collectors was investigate d theoretically and experimentally. A new analysis for calculating the coll oid deposition efficiency was developed. The analysis includes the effect o f the flow field on the deposition of a colloidal particle through the inte ractive potential barrier between the particle and the solid surface. The d eposition behavior of polystyrene latex particles (diameter: 102 nm) in tra nsport process through columns (length: 100 mm) packed with glass beads (di ameter: 0.35-0.40 nim) was observed. The colloid deposition efficiencies ca lculated by the new analysis were comparable with those obtained by the exp eriments. The result indicates that the effect of the flow field would caus e the difference between the flow velocity dependence of the efficiency obt ained by a classical analysis and that by the experimental results. The col loid deposition efficiencies were also obtained by estimating the deposited particles onto the glass beads surface suspended in the colloidal suspensi on from the SEM observation of the glass beads surface. The effect of the h eterogeneity of the collector surface was discussed by calculating the coll oid deposition efficiency using the evaluated interaction potential between the particle and the heterogeneous collector surface.