A new method to evaluate polydisperse kaolinite clay particle removal in roughing filtration using colloid filtration theory.
Previous application of colloid filtration theory to roughing filtration has not considered a reliable method for determining a representative attachment factor for a polydisperse suspension (of constant particle density). Establishment of such a method would broaden the application of trajectory modelling in roughing filtration, and progress the development of a comprehensive database of attachment factors and surface charge potentials for various particle and fluid types. This study establishes a methodology for the application of colloid filtration theory to roughing filtration and incorporates recent advancements in theoretical single-collector efficiency. A polydisperse kaolinite clay suspension was passed through a series of four gravel upflow roughing filters and removal efficiencies were calculated. Both the classical and Tufenkji and Elimelech's more recent correlation equations were used to calculate theoretical single-collector efficiencies and associated attachment factors for three different filter media sizes, flow rates, and suspended solids concentrations (0.137+/-0.023). The use of Tufenkji and Elimelech's modified correlation equation resulted in reduced variability in the estimation of theoretical single-collector efficiencies.
Lin
Edwin
E
CSIRO Land and Water, PMB2, Glen Osmond, SA 5064, Australia.
Page
Declan
D
Pavelic
Paul
P
D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D003102:Colloids; D005374:Filtration / Q000295:instrumentation / Q000379:methods; D007616:Kaolin / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
D000538:Aluminum Silicates; D003102:Colloids; D014874:Water Pollutants, Chemical; D007616:Kaolin; D000077215:Clay