Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 23, Issue 2, Pages 333-342Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/BF02705738
Keywords
collision efficiency; initial single collector efficiency; ionic strength; latex particles; porous media filtration; specific surface coverage
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Four sizes (0.095, 0.53, 1.0 and 2.01 mu m) of polystyrene latex particles were used to prepare monodispersed suspensions at three different ionic strengths (10(-3), 10(-2.5) and 10(-2) M KCl). Filtration experiments were conducted using those suspensions in a filter column with glass beads as porous medium. The filter bed depth and the filtration velocity were kept at 5 cm and 1 m/h, respectively. When suspensions with equal mass concentrations (0.2 mg/L) or equal surface area concentrations (0.12 cm(2)/mL) were filtered through the system, the largest particles exhibited higher initial single collector efficiency, eta. The difference between the eta of largest particles and the smaller particles was prominent for Suspensions with equal surface area concentrations at higher ionic strengths. The collision efficiency, a of those particles exhibits higher values at higher ionic strengths. Both at equal mass concentration and equal surface area concentration, alpha is only slightly dependent oil particle sizes when compared to its dependence oil ionic strength. Further, it was found that the specific surface coverage was similar for 0.095 mu m, 0.53 mu m and 1.0 mu m particles during the transient stage of filtration at any ionic strength when the surface area concentrations of those suspension were equal.
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