| Abstract |
| In cross-flow microfiltration (CFMF), suspended particles deposit to form a cake layer on the membrane surface, which provides a resistance to permeate flow. The cake resistance, which plays an important role on the performance of CFMF, is mainly determined by the packing porosity of the cake and, the physical and chemical properties of particles. This study is aimed at understanding the porosity and the specific filtration resistance of the cake for a given condition. These properties have been studied using experiments under a constant permeate flux. Constant structure of cake as well as constant rate of particles deposition was obtained by controlling the permeate flux. Factors affecting the particles deposition and cake formation such as permeate flux and ionic strength were investigated. This study also adopted a force balance model to predict the deposition rate of particle and compare with the experimental results. Inter-particle forces (electric double layer repulsion force and Van der Waals attraction force) were incorporated into the calculation of cake structure (cake porosity and specific resistance) together with the equilibrium condition of hydrodynamic forces. The values of the porosity and the specific resistance of the cake calculated by the force balance model agreed well with the experimental data. |
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| Key Words |
| cross-flow microfiltration, permeate flow, particle deposit, ionic strength, cake layer, hydrodynamic force |
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