Chapitre D'ouvrage Année : 2020

Chapter 4. Soil Vapor Extraction: Fundamentals, Theory (Permeability and Gas–Non-aqueous Phase Liquid Mass Transfer Coefficient) and Applications

Résumé

Soil vapor extraction (SVE) is used fairly extensively as an in situ remediation method for removing volatile organic compounds from subsurface soil. Soil air permeability and gas–non-aqueous phase liquid (NAPL) mass transfer are the key parameters in designing an SVE system. In this work, the impact of these two parameters on SVE performance was studied. In the first part, a model that can be used to simulate SVE operations during soil decontamination is presented. In the second part, the effect of permeability is considered on the basis of results from (1) experiments on unpolluted sand that allow the verification of the applicability of different analytical solutions, to estimate soil air permeability in a small-scale pilot unit and the improvement of an SVE system performance when surface covers are used, and (2) an experiment on the application of SVE to verify the behavior of permeability under SVE conditions. In the last part, it was determined whether mass transfer parameters obtained from calibrating a model against unidirectional column experiments could be used for three-dimensional applications. Comparison of gas–NAPL mass transfer obtained from different models with experimental results shows the limits of each model. The use of an adequate gas–NAPL mass transfer allows a good simulation of the SVE and venting operation.

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Dates et versions

hal-04944118 , version 1 (13-02-2025)

Identifiants

Citer

Otmane Boudouch, Mariem Kacem, Belkacem Benadda. Chapter 4. Soil Vapor Extraction: Fundamentals, Theory (Permeability and Gas–Non-aqueous Phase Liquid Mass Transfer Coefficient) and Applications. The Handbook of Environmental Remediation, Royal Society of Chemistry, pp.88-120, 2020, ⟨10.1039/9781788016261-00088⟩. ⟨hal-04944118⟩
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