Soil Clean Up by in-situ Aeration. IX. Diffusion Constants of Volatile Organics and Removal of Underlying Liquid
- 1 December 1991
- journal article
- research article
- Published by Taylor & Francis in Separation Science and Technology
- Vol. 26 (12) , 1433-1466
- https://doi.org/10.1080/01496399108050543
Abstract
The removal of volatile organic compounds (VOCs) underlying the vadose zone in a pool of nonaqueous phase liquid (NAPL) in the vicinity of a soil vapor stripping well is modeled mathematically. The diffusivity of the VOC is an important parameter determining the rate of removal of the NAPL; diffusivities of hexane, toluene, trichloroethylene, tetrachloroethylene, and 1,1,1-trichloroethane were determined in fine sand and found to be approximately 2 × 10−6 m−2/s at 25°C. Vapor stripping appears to be a practical method for the removal of NAPL floating on the water table or confined there by capillary pressure, as indicated by mathematical modeling and by bench-scale soil vapor stripping experiments.Keywords
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