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Influence of Cross-Flow Velocity on Membrane Performance during Filtration of Biological Suspension
Journal of Membrane Science
  • Hyeok Choi
  • Kai Zhang
  • Dionysios D. Dionysiou
  • Daniel B. Oerther, Missouri University of Science and Technology
  • George A. Sorial

Through a new experimental procedure, the influence of cross-flow velocity on the formation of fouling layer during microfiltration (MF) and ultrafiltration (UF) of biological suspension with 5 g/l of mixed liquor suspended solids was studied. Based on the resistance-in-series model, filtration resistances caused by adsorption, concentration polarization, and reversible and irreversible fouling were determined. Each filtration resistance was compared with respect to the mass, thickness and density of the corresponding fouling layer (or foulants). Moreover, the effect of fouling layer on permeate quality was investigated. The obtained results showed that permeate flux increased linearly with increasing cross-flow velocity and a high cross-flow velocity was more effective to reduce fouling of MF membrane than that of UF membrane. The formation of a reversible fouling layer was actually prevented by a cross-flow velocity of 3.0 m/s for MF membrane and 2.0 m/s for UF membrane. In all cases, the magnitude of reversible and irreversible filtration resistances matched well the mass and thickness of their corresponding fouling layer. Along with its mass and thickness, the density of fouling layer was another important factor affecting filtration resistance and dissolved organic carbon (DOC) rejection. Distinct fouling layers as well as pore blocking and the narrowed pore itself were the major contributions for enhanced DOC rejection.

Civil, Architectural and Environmental Engineering
Keywords and Phrases
  • Adsorption,
  • Carbon,
  • Dissolution,
  • Linearization,
  • Microfiltration,
  • Polarization,
  • Ultrafiltration,
  • Biological suspension,
  • Dissolved organic carbon (DOC),
  • Filtration resistance,
  • Permeate flux,
  • Membranes,
  • organic carbon,
  • filtration,
  • membrane,
  • performance,
  • suspension,
  • artificial membrane,
  • biofouling,
  • density,
  • flow rate,
  • liquid,
  • mass,
  • membrane permeability,
  • porosity,
  • priority journal,
  • solid,
  • thickness,
  • Cross-flow velocity,
  • Fouling
Document Type
Article - Journal
Document Version
File Type
© 2005 Elsevier Limited, All rights reserved.
Publication Date
Citation Information
Hyeok Choi, Kai Zhang, Dionysios D. Dionysiou, Daniel B. Oerther, et al.. "Influence of Cross-Flow Velocity on Membrane Performance during Filtration of Biological Suspension" Journal of Membrane Science Vol. 248 Iss. 1-2 (2005) p. 189 - 199 ISSN: 0376-7388
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