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Title: Analytical model for heterogeneous reactions in mixed porous media

Abstract

The funnel/gate system is a developing technology for passive ground-water plume management and treatment. This technology uses sheet pilings as a funnel to force polluted ground water through a highly permeable zone of reactive porous media (the gate) where contaminants are degraded by biotic or abiotic heterogeneous reactions. This paper presents a new analytical nonequilibrium model for solute transport in saturated, nonhomogeneous or mixed porous media that could assist efforts to design funnel/gate systems and predict their performance. The model incorporates convective/dispersion transport, dissolved constituent decay, surface-mediated degradation, and time-dependent mass transfer between phases. Simulation studies of equilibrium and nonequilibrium transport conditions reveal manifestations of rate-limited degradation when mass-transfer times are longer than system hydraulic residence times, or when surface-mediated reaction rates are faster than solute mass-transfer processes (i.e., sorption, film diffusion, or intraparticle diffusion). For example, steady-state contaminant concentrations will be higher under a nonequilibrium transport scenario than would otherwise be expected when assuming equilibrium conditions. Thus, a funnel/gate system may fail to achieve desired ground-water treatment if the possibility of mass-transfer-limited degradation is not considered.

Authors:
 [1];  [2];  [3]
  1. Univ. of Florida, Gainesville, FL (United States). Dept. of Civil Engineering
  2. Armstrong Lab., Tyndall AFB, FL (United States). Environmental Research Lab.
  3. EPA, Athens, GA (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
287533
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Engineering
Additional Journal Information:
Journal Volume: 122; Journal Issue: 8; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; GROUND WATER; REMEDIAL ACTION; SOLUTES; ENVIRONMENTAL TRANSPORT; BIODEGRADATION; MATHEMATICAL MODELS; CONTAINMENT SYSTEMS; PERFORMANCE; TECHNOLOGY ASSESSMENT; POROUS MATERIALS; IN-SITU PROCESSING

Citation Formats

Hatfield, K, Burris, D R, and Wolfe, N L. Analytical model for heterogeneous reactions in mixed porous media. United States: N. p., 1996. Web. doi:10.1061/(ASCE)0733-9372(1996)122:8(676).
Hatfield, K, Burris, D R, & Wolfe, N L. Analytical model for heterogeneous reactions in mixed porous media. United States. https://doi.org/10.1061/(ASCE)0733-9372(1996)122:8(676)
Hatfield, K, Burris, D R, and Wolfe, N L. 1996. "Analytical model for heterogeneous reactions in mixed porous media". United States. https://doi.org/10.1061/(ASCE)0733-9372(1996)122:8(676).
@article{osti_287533,
title = {Analytical model for heterogeneous reactions in mixed porous media},
author = {Hatfield, K and Burris, D R and Wolfe, N L},
abstractNote = {The funnel/gate system is a developing technology for passive ground-water plume management and treatment. This technology uses sheet pilings as a funnel to force polluted ground water through a highly permeable zone of reactive porous media (the gate) where contaminants are degraded by biotic or abiotic heterogeneous reactions. This paper presents a new analytical nonequilibrium model for solute transport in saturated, nonhomogeneous or mixed porous media that could assist efforts to design funnel/gate systems and predict their performance. The model incorporates convective/dispersion transport, dissolved constituent decay, surface-mediated degradation, and time-dependent mass transfer between phases. Simulation studies of equilibrium and nonequilibrium transport conditions reveal manifestations of rate-limited degradation when mass-transfer times are longer than system hydraulic residence times, or when surface-mediated reaction rates are faster than solute mass-transfer processes (i.e., sorption, film diffusion, or intraparticle diffusion). For example, steady-state contaminant concentrations will be higher under a nonequilibrium transport scenario than would otherwise be expected when assuming equilibrium conditions. Thus, a funnel/gate system may fail to achieve desired ground-water treatment if the possibility of mass-transfer-limited degradation is not considered.},
doi = {10.1061/(ASCE)0733-9372(1996)122:8(676)},
url = {https://www.osti.gov/biblio/287533}, journal = {Journal of Environmental Engineering},
number = 8,
volume = 122,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1996},
month = {Thu Aug 01 00:00:00 EDT 1996}
}