Numerical modeling of arsenic mobility - In-Situ Remediation of Arsenic-Contaminated Sites - page 37

Table 2.1. Continued.

Code Website Summary

MINTEQA2 http://www2.epa.gov/

exposure-assessment-
models/minteqa2

MINTEQA2 is a geochemical equilibrium speciation
model capable of computing equilibria among
dissolved, adsorbed, solid, and gas phases.
MINTEQA2 includes an extensive database of
thermodynamic data for many constituents of
environmental interest.

B: Single- and multi-species transport models
FEFLOW http://www.feflow.com/

aboutfeflow.html

FEFLOW is a finite-element software package for
modeling fluid flow and transport of dissolved constituents
and/or heat transport processes in the subsurface.
Multi-dimensional groundwater flow, including
density-dependent flow can be combined with the
simulation of multi-species solute transport in groundwater
and the unsaturated zone. Reaction modules available
include decay and sorption and the possibility to define
kinetic reactions via an equation editor.

FEMWATER http://homepage.usask.

ca/

A 3D finite-element model used to simulate density-driven
coupled flow and contaminant transport in saturated and
unsaturated zones. FEMWATER allows modeling of
salinity intrusion and other density-dependent
contaminants and simple transport problems such as
sorption and decay.

mjr347/gwres/
femwref.pdf

∼

HST3D http://wwwbrr.cr.usgs.

gov/projects/GW_
Solute/hst/

The HST3D code is suitable for simulating groundwater
flow and associated heat and solute transport in saturated,
three-dimensional flow systems with variable density
and viscosity.

HYDRUS-
1D/2D/3D

http://igwmc.mines.
edu/software/hydrus.
html

HYDRUS is a software package for the analysis of water
flow and solute transport in variably saturated porous
media. The geochemical UNSATCHEM module
(Šimunek and Suarez, 1994; Šimunek et al ., 1996) has
been implemented into the HYDRUS (2D/3D) software
package to simulate the transport of major ions in
variably-saturated porous media, including major ion
equilibrium and kinetic non-equilibrium chemistry. The
model accounts for various equilibrium chemical reactions
between these components, such as complexation, cation
exchange and precipitation-dissolution.

MT3DMS http://hydro.geo.ua.

edu/mt3d/

The multi-species transport simulator MT3DMS has the
capability of modeling changes in concentrations of
groundwater contaminants due to advection, dispersion,
diffusion, and some chemical reactions including
equilibrium-controlled linear or non-linear sorption, and
first-order irreversible or reversible kinetic reactions.
MT3D/MT3DMS uses the output head and cell-by-cell
flow data computed by MODFLOW to establish the
groundwater flow field.

( continued )