Investigation of Flux Decline in Tortuous Pore Structures via Three Dimensional Simulation of Cross Flow Microfilter Fouling

Abstract

This paper presents a fluid dynamicbased approach to the prediction of the flux decline due to partial and complete pore blocking in the microfiltration process. The electrostatic force model includes both particle–particle (PP) and particle–membrane (PM) electrostatic forces. The addition of such forces was shown to affect particle trajectories in a tortuous threedimensional microfilter membrane geometry. The model was validated by comparing experimental flux decline data with simulation flux decline data. A design of experiments was conducted to investigate the effects of transmembrane pressure, PMand PPzeta potential on flux decline. The simulation experiments revealed that low flux decline was associated with relatively low transmembrane pressures and nearzero values of PPand PMzeta potential; and relatively high transmembrane pressures and morenegative values of PPand PMzeta potential. The amount of flux decline was shown to be correlated to the specific nature of partial and complete pore blocking in the pore structure.