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Effect of ionic strength and permeate flux on membrane fouling: Analysis of forces acting on particle deposit and cake formation

  • Environmental Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

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 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. Factors such as permeate flux and ionic strength were investigated in terms of the particles deposition and cake formation. This study also adopted a force balance model to predict the deposit rate of particles and then 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 experimental results showed that the higher the permeate flux led to the greater amount of particles deposit and the denser structure of cake. The porosity of cake decreased with the increase in ionic strength (0∼0.01M) and then increased sharply afterwards (0.01∼0.1M). The hydrodynamic force balance model estimated well the tendency of variation in cake structure depending on the ionic strength.

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Authors and Affiliations

  1. Faculty of Engineering, School of Civil & Environmental Engineering, University of Technology Sydney, PO Box 123, Broadway, Sydney, NSW, 2007, Australia

    S. Vigneswaran

  2. Dept. of Civil and Urban Engineering, Inje University, Gimhae, 621-749, Korea

    Dae-Young Kwon

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  1. S. Vigneswaran
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  2. Dae-Young Kwon
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Vigneswaran, S., Kwon, DY. Effect of ionic strength and permeate flux on membrane fouling: Analysis of forces acting on particle deposit and cake formation. KSCE J Civ Eng 19, 1604–1611 (2015). https://doi.org/10.1007/s12205-014-0079-0

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  • DOI: https://doi.org/10.1007/s12205-014-0079-0

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