Abstract
We present a modeling approach to determine the permeability-selectivity tradeoff for microfiltration and ultrafiltration membranes with a distribution of pore sizes and pore shapes. Using the formulated permeability-selectivity model, the effect of pore aspect ratio and pore size distribution on the permeability-selectivity tradeoff of the membrane is analyzed. A finite element model is developed to study the effect of membrane stretching on the distribution of pore sizes and shapes in the stretched membrane. The effect of membrane stretching on the permeability-selectivity tradeoff of membranes is also analyzed. The results show that increasing pore aspect ratio improves membrane performance while increasing the width of pore size distribution deteriorates the performance. It was also found that the effect of membrane stretching on the permeability-selectivity tradeoff is greatly affected by the uniformity of pore distribution in the membrane. Stretching showed a positive shift in the permeability-selectivity tradeoff curve of membranes with well-dispersed pores while in the case of pore clustering, a negative shift in the permeability-selectivity tradeoff curve was observed.
Highlights
Microfiltration and ultrafiltration are widely used techniques in applications ranging from wastewater treatment to biomedical applications and the food industry
Bothan found that an the pore aspect ratio in resulted in improved permeate. Both found that increase in increase the poreinaspect ratio resulted improved permeate flux, butflux, no but no definite trend in the rejection rate of the solutes was observed as the uniaxial strain applied to definite trend in the rejection rate of the solutes was observed as the uniaxial strain applied to the the membrane was increased
In order to study the effect of pore aspect ratio on the permeability-selectivity performance of microfiltration and ultrafiltration membranes, a study was conducted in which the aspect ratio of the pores was changed while keeping the pore cross-section area constant
Summary
Microfiltration and ultrafiltration are widely used techniques in applications ranging from wastewater treatment to biomedical applications and the food industry. Permeate flux compared to circularflux pores for sameto rejection aspect ratio hasIncreased been aspect ratio has been linked to reduced fouling rates in membranes [10]. PES and PVDF membranes, of PET track-etched membranes and phase-inversion PES and PVDF membranes, respectively Both found that increase in increase the poreinaspect ratio resulted improved permeate flux, butflux, no but no definite trend in the rejection rate of the solutes was observed as the uniaxial strain applied to definite trend in the rejection rate of the solutes was observed as the uniaxial strain applied to the the membrane was increased. No model is available that can predict can the predict the permeability-selectivity characteristics of microfiltration and ultrafiltration membranes permeability-selectivity characteristics of microfiltration and ultrafiltration membranes taking into taking into theaspore as well as pore ratio distributions. The effect of porosity dispersion uniformity on the performance of stretched membrane is studied
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