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Mathematical modeling of BTX: biotransformation and transport in the subsurface.

A two-dimensional compositional model is presented; this model describes the transport and biotransformation of organic contaminants in a variably saturated subsurface environment. Modeled processes included mass exchange between constituent phases (water, air, soil, and organisms), advective and di...

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Detalles Bibliográficos
Autores principales: Abriola, L M, Chen, Y M
Formato: Texto
Lenguaje:English
Publicado: 1995
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1519287/
https://www.ncbi.nlm.nih.gov/pubmed/8565918
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author Abriola, L M
Chen, Y M
author_facet Abriola, L M
Chen, Y M
author_sort Abriola, L M
collection PubMed
description A two-dimensional compositional model is presented; this model describes the transport and biotransformation of organic contaminants in a variably saturated subsurface environment. Modeled processes included mass exchange between constituent phases (water, air, soil, and organisms), advective and dispersive fluxes in the water phase, diffusive flux in the air phase, and biotransformation and biomass production in the biophase. In this model, solute transfer across air/water and water/solid interfaces is modeled using equilibrium relationships. Rate-limited mass transfer between the water and biophases is described with a linear driving force expression. Microbial degradation and biomass net growth are modeled by Monod-type kinetics. Solute transport and microbial growth equations are solved using an iterative Galerkin finite element method with a variable time-weighting scheme. Coupled biophase mass balance equations for each component are solved with a Newton-Raphson iterative scheme. Model capabilities are illustrated with two-dimensional, cross-sectional simulations of natural bioattenuation. The influence of biotransformation processes on the transport and extent of a toluene plume is examined.
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spelling pubmed-15192872006-07-28 Mathematical modeling of BTX: biotransformation and transport in the subsurface. Abriola, L M Chen, Y M Environ Health Perspect Research Article A two-dimensional compositional model is presented; this model describes the transport and biotransformation of organic contaminants in a variably saturated subsurface environment. Modeled processes included mass exchange between constituent phases (water, air, soil, and organisms), advective and dispersive fluxes in the water phase, diffusive flux in the air phase, and biotransformation and biomass production in the biophase. In this model, solute transfer across air/water and water/solid interfaces is modeled using equilibrium relationships. Rate-limited mass transfer between the water and biophases is described with a linear driving force expression. Microbial degradation and biomass net growth are modeled by Monod-type kinetics. Solute transport and microbial growth equations are solved using an iterative Galerkin finite element method with a variable time-weighting scheme. Coupled biophase mass balance equations for each component are solved with a Newton-Raphson iterative scheme. Model capabilities are illustrated with two-dimensional, cross-sectional simulations of natural bioattenuation. The influence of biotransformation processes on the transport and extent of a toluene plume is examined. 1995-06 /pmc/articles/PMC1519287/ /pubmed/8565918 Text en
spellingShingle Research Article
Abriola, L M
Chen, Y M
Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title_full Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title_fullStr Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title_full_unstemmed Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title_short Mathematical modeling of BTX: biotransformation and transport in the subsurface.
title_sort mathematical modeling of btx: biotransformation and transport in the subsurface.
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1519287/
https://www.ncbi.nlm.nih.gov/pubmed/8565918
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