Three-Phase Multi-Component Soil-Vapor Extraction

Predict remediation clean-up times and estimate well vapor concentrations.

Easily design the model grid and input parameters.... the simulation

...and graphically display the results in many different formats.

AIRFLOW/SVE is a finite-difference numerical model for simulating vapor flow and multi-component vapor transport in unsaturated, heterogeneous and anisotropic soil. AIRFLOW/SVE calculates radially-symmetrical, steady-state vapor flow towards an extraction well and accounts for time-variant depletion of non-aqueous phase liquid (NAPL) organic contaminants. AIRFLOW/SVE contains a fully-integrated graphical interface, allowing the user to easily design the model, run simulations, display results, and produce report quality output, all within the same seamless environment. The comprehensive formulation of AIRFLOW/SVE provides a rigorous treatment of the vapor flow and mass partitioning processes. In addition, AIRFLOW/SVE has extensive output display options which make it the model of choice for designing and evaluating vapor transport in the unsaturated zone, soil bioventing systems and soil vapor extraction (SVE) remediation systems.

AIRFLOW/SVE computes, for a vertical cross section, the steady-state vapor pressure distribution, velocities, and pathlines for an ideal, single phase, compressible gas. Different gases are simulated by specifying different gas constants, gas molar masses, and viscosities. AIRFLOW/SVE accounts for temperature and pressure-dependent gas density. The model domain can be made up of heterogeneous and anisotropic permeability zones. Along any one of the model domain's boundaries, constant pressure or constant flux (including impermeable conditions can be imposed.

AIRFLOW/SVE overcomes major limitations of other commercial vacuum extraction models: volumetric gas flow rates are calculated directly by the model and vary spatially; the NAPL can be present in the form of residual, lenses, or pools and can be spatially distributed; and mass transfer between NAPL, water, and gas can be represented as kinetically-controlled as well as by equilibrium processes. Various types of sorption isotherms can be considered by AIRFLOW/SVE. Differential NAPL depletion can be simulated with the more volatile compounds being depleted first, leaving behind the less volatile species.

AIRFLOW/SVE uses an efficient and robust numerical solver to ensure conservation of mass and that large simulations (with several chemical components) can be analyzed quickly using a personal computer.


AIRFLOW/SVE is the most comprehensive soil vapor flow and multi-component transport model available!

Fully Integrated User Interface:

Comprehensive Formulation:

This is a "must have" tool for designing and evaluating soil vapor extraction and bioventing remediation systems.

Predict contaminant mass extracted.

Overlay soil concentration contours with soil vapor pressure contours.


AIRFLOW/SVE is a fully-integrated modeling package whereby all of the data input is done graphically through an interactive, user-friendly interface:


As you specify your model and just prior to the data analysis, the program automatically checks your input data for errors. If there is an error with your input data, AIRFLOW/SVE will explain what is wrong and how to correct it. As a result of this detailed input error checking, input of faulty data is almost entirely eliminated.


AIRFLOW/SVE overcomes the major limitations of other commercial SVE models by considering vapor flow through heterogeneous and anisotropic soil with variable water contents, and by implementing a rigorous treatment of the partitioning processes which occur between the soil, aqueous, NAPL and vapor phases. In addition:
With AIRFLOW/SVE, the efficient algorithms and robust numerical methods assure conservation of mass for the vapor and NAPL for large simulations with several different chemical components.


AIRFLOW/SVE comes complete with high-quality post-processing capabilities for displaying results (see graphics) and outputting them to a printer, plotter or graphics file. The extensive display options include:
These results can be sent to most printers and plotters and can be exported to various graphics file formats (DXF, PCX, EPS, TIF, GlF, etc.).


AIRFLOW/SVE includes a comprehensive user's manual with a summary of the underlying theory and equations, easy-to-follow instructions and an example problem with step-by-step instructions. Free technical support is provided via phone, fax or e-mail.


PC 486/Pentium with 4 MB RAM and 10 MB free disk space.

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Incredible NetworksΤελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27th 2004
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