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Numerical Analysis of field scale air sparging remediation

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  037041,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.15428)
Authors:   Michel Rahbeh, Rabi Mohtar
Keywords:   air sparging; soil vapor extraction; soil and ground water remediation; numerical modeling, sensitivity analysis, first order mass transfer kinetics

Unsaturated flow and multiphase model was applied to field scale case study to analysis the removal of Toluene, Ethyl Benzene and Xylenes (TEX) by air sparging remediation system. The model consists of two main modules; the first module, the unsaturated flow that solves for air flow, using air permeability as an input and determines the capillary pressure distribution. The second module, multiphase contaminant transport, which incorporates first order mass transfer kinetics to model the contaminant mass transfer among all phases involved: aqueous, non-aqueous, gaseous and, solid phases. The steady state air flow is determined first, and then the pressure heads are interpolated to the transport model. The model was applied in practical framework that considers two air sparging wells positioned at the vertical boundaries of the domain to represent symmetrical air sparging system. The simulation results compared reasonably well with field observations demonstrating the model capability as tool for the design and operation of mutliphase systems that include an advective air flux such air sparging and soil vapor extraction.

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