AIRFLOW/SVE is a three-phase multi-component numerical model for simulation of soil vapor extraction systems in areas contaminated by non-aqueous phase liquids (NAPL'S). The model takes into account radial-symmetric steady state gas flow towards an extraction well and transient vapor transport of multiple species in heterogeneous unsaturated media. The model calculates volumetric gas flow rates which can vary spatially. The NAPL can be present in the form of residual, lenses or pools and be spatially distributed. Mass transfer between NAPL, water and gas can be represented as kinetically controlled as well as equilibrium-process controlled. Various types of sorption isotherms can be considered. Differential NAPL depletion is simulated with the more volatile compounds being depleted first, leaving behind the less volatile species. The model results can be displayed as isobar contours, velocity vectors, pathlines, concentration contours for each component and mass remaining contours. X-Y plots can also be produced including total mass removed in the well vs. time, and breakthrough curves for each component.

AIRFLOW/SVE is a self contained package where all data input and output is done via an interactive graphical user interface. This user friendly interface makes the design and modification of highly complex model extremely easy. AIRFLOW. Distribution disks of this proprietary program contain executable images and example data sets. The documentation consists of installation instructions, theory, input instructions, and example problems.

SYSTEM REQUIREMENTS

Developer: Waterloo Hydrogeologic Software, Waterloo, Ontario, Canada.