Abstract
This article presents an experimental and theoretical study of volatile organic compounds volatilisation in soil during a decontamination process by vapour extraction or venting. A phase change law is proposed in the case of a sandy-silty soil when the convective gaseous phase is vapour charged. A simple experimental method for analysing the phase change is presented. Finally, an efficiency coefficient is introduced to quantify the contribution of airflow velocity on venting. Cet article présente une étude expérimentale et théorique de la volatilisation d’un COV dans un sol soumis à une décontamination par ventilation. On propose une relation de changement de phase dans le cas convectif pour un limon sableux hygroscopique lorsque l’air en mouvement est chargé de vapeur de COV. Une méthode expérimentale simple d’analyse du changement de phase est proposée. Finalement un coefficient d’efficacité est introduit pour quantifier l’influence de la vitesse de l’air sur l’efficacité de la ventilation.
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