Modeling of NOM-Facilitated PAH Transport through Low- f oc Sediment
Publication: Journal of Environmental Engineering
Volume 121, Issue 6
Abstract
A finite-difference model was developed to more closely examine the observation that polycyclic aromatic hydrocarbon (PAH) transfer to and from low-organic-carbon aquifer sediment and aqueous natural organic matter (NOM) apparently occurred uninhibited by kinetic limitations during facilitated-transport and enhanced-desorption experiments performed in laboratory columns. The model accounted for advection, dispersion, and mass transfer between the various phases comprising the system; i.e., distribution of PAH between water and sediment and water and NOM, and distribution of NOM between water and sediment. The model was run using mass-transfer coefficients based on the equilibrium constants derived from experimental data and compared against the literature. Successful reproduction of the experimentally observed facilitated-transport and enhanced-desorption curves indicated that our physical system was free of kinetic limitations and was describable by the equilibrium constants comprising the system.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 121 • Issue 6 • January 1995
Pages: 438 - 446
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Jan 19, 1995
Published in print: Jan 19, 1995
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