Particle back-transport and permeate flux behavior in crossflow membrane filters
Article Abstract:
Selective particle transport and accumulation on membranes occur in membrane filtration, as evidenced by a comparison of particle size distributions in the membrane feed suspensions and deposited cakes. This affirms that a previously hypothesized minimum in particle back-transport from the membrane is a function of particle size. Brownian diffusion appears to account for the back-transport of smaller particles, while an orthokinetic mechanism controls larger macrocolloids. Cake-specific resistances measured in the dead-end mode were higher than those of corresponding feed suspensions, and those measured under a crossflow were higher than those in the dead-end mode.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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Multifractal analysis of particle size distributions in soil
Article Abstract:
It is not enough to rely on simple power law as a means of measuring particle size distributions in air, water and soil. When utilized against the context of fractal dimension, the method comes up with an approximation of the geometrical features of particles and characteristics of aggregates in terms of their density and porosity. There is an alternative method of sealing identified as multifractal, which addresses the inadequacy of using the simple power law. Data on soil grain size distributions were studies to illustrate how much more appropriate it would be to use multifractal behavior.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Particle transport in clean membrane filters in laminar flow
Article Abstract:
A study of the effects of laminar cross-flow membrane filtration on particle transport and deposition is presented. Theoretical predictions incorporating such factors as Coulombic and hydrodynamic forces were compared with particle residence time distributions determined experimentally. The study found that such factors as particle size, permeation rate and cross-flow velocity determined the extent of transport and deposition. The research from this study may be useful for wastewater treatment.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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