Soil Clean Up byin-situAeration. V. Vapor Stripping from Fractured Bedrock

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Abstract
A mathematical model for soil vapor stripping is presented which permits one to model vapor stripping from porous fractured bedrock, where one cannot make the assumption of local equilibrium between the stationary condensed phase and the moving vapor phase with respect to contaminant transport. Models for lab column operation and field operation of a vapor stripping well are presented. A lumped parameter approach is used to handle the kinetics of diffusion of the volatile contaminant from the interiors of the pieces of bedrock out to the moving soil gas. A method for estimating the time constant for this diffusion transport is presented, and the effects of the time constant on the performance of vapor stripping operations are assessed. The effects of impermeable circular caps on vapor stripping wells with and without passive vent wells are examined.