Surface Free Energy Relationships used to Evaluate Microbial Transport
Publication: Journal of Environmental Engineering
Volume 128, Issue 5
Abstract
A microbial transport study of Escherichia coli, Pseudomonas fluorescens, and Pseudomonas aeruginosa through model media of silica gel and alluvial loam from the Central Oklahoma Aquifer demonstrated that the retardation factor and deposition coefficient are related to the free energy of surface interactions between the bacteria and the media at different distances, which are determined by the radius and the surface thermodynamics of the microorganisms and the surface thermodynamics of the media. A combined model that incorporates the deep-bed filtration model into a simple convection-dispersion model was used in evaluating the microbial transport. The deposition coefficient, which describes irreversible adsorption, was a function of the free energy of the surface interactions at the closest approach (1.57 Å) where Lewis acid-base interactions dominated. However, the retardation factor, which describes reversible adsorption of bacterial transport, was a function of the free energy of the surface interactions at the last inflection point where van der Waals interactions dominated (∼10 μm in this study).
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Information
Published In
Journal of Environmental Engineering
Volume 128 • Issue 5 • May 2002
Pages: 408 - 415
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jan 2, 2001
Accepted: Sep 28, 2001
Published online: Apr 15, 2002
Published in print: May 2002
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