Finite difference approach for mathematical simulation of soil vapor extraction from unsaturated zone

Amit Armstrong, Kenneth A. Rainwater, C. V.G. Vallabhan, Harry W. Parker

Research output: Contribution to conferencePaperpeer-review

Abstract

This paper describes the development of a mathematical model to simulate soil vapor extraction for the removal of gasoline-range hydrocarbons from the unsaturated zone. The model solves a set of partial differential equations for two-dimensional gas flow and advective-dispersive vapor transport in variably saturated porous media with a finite difference approach. The soil vapor extraction process involves volatilization, gas advection, gas diffusion, liquid diffusion, residual saturation, vapor-liquid equilibrium, and mass transfer. The variable mass transfer coefficient is governed by the diffusion process. Changes in the air permeability of the porous media are calculated as the residual liquids are volatilized. The model is intended for field-scale application to aid in design, development, and operation of high-efficiency soil vapor extraction systems.

Original languageEnglish
Pages30-34
Number of pages5
StatePublished - 1995
EventProceedings of the International Symposium on Groundwater Management - San Antonio, TX, USA
Duration: Aug 14 1995Aug 16 1995

Conference

ConferenceProceedings of the International Symposium on Groundwater Management
CitySan Antonio, TX, USA
Period08/14/9508/16/95

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