Numerical Model For The Uptake Of
Groundwater Contaminants By Phreatophytes
Author(s)
M. A. Widdowson, A. El-Sayed & J. E. Landmeyer
Abstract
Conventional solute transport models do not adequately account for the effects of
phreatophytic plant systems on contaminant concentrations in shallow groundwater
systems. A numerical model was developed and tested to simulate threedimensional
reactive solute transport in a heterogeneous porous medium.
Advective-dispersive transport is coupled to biodegradation, sorption, and plantbased
attenuation processes including plant uptake and sorption by plant roots.
The latter effects are a function of the physical-chemical properties of the
individual solutes and plant species. Models for plant uptake were tested and
evaluated using the experimental data collected at a field site comprised of
hybrid poplar trees. A non-linear equilibrium isotherm model best represented
site conditions.
Keywords: phytoremediation, plant uptake, volatile organic compounds, solute
transport, groundwater.
1 Introduction
Phytoremediation is the use of plants to remediate contamination in soil and
groundwater. Engineered phytoremediation systems have served as the primary
remedial strategy at some sites, but it is more common for plants to be used in
combination with other technologies as a polishing step. The initial application
of phytoremediation was the use of hyperaccumulator plants to extract and
accumulate toxic heavy metals from surface soils. Since then, a number of
mechanisms have been shown to remove or degrade volatile organic compounds
(VOC), such as trichloroethene (TCE), during phytoremediation. Plant-based
Keywords
phytoremediation, plant uptake, volatile organic compounds, solute
transport, groundwater.
Related Book
Other papers in this volume
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