Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Etats Unis → 1989 → Sorption and desorption of benzene and para-xylene on an unsaturated desert soil

University of Arizona (1989)

Sorption and desorption of benzene and para-xylene on an unsaturated desert soil

Davis, James Hal

Titre : Sorption and desorption of benzene and para-xylene on an unsaturated desert soil

Auteur : Davis, James Hal,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1989

Résumé
A series of bench-scale experiments was carried out to determine the rate and efficiency with which benzene and p-xylene, components of gasoline, could be removed from an unsaturated soil by air stripping. Glass columns, 30 cm in length, were packed with soil and wetted to volumetric moisture contents of 10 and 18 percent. Air saturated with one of the volatile organic compounds (VOCs) was used to load the column. Clean air was used to strip the contaminant from the soil. Benzene and p-xylene concentrations in the soil water and air were reduced four orders of magnitude after a few hours (2-8) of stripping. Benzene was removed faster than p-xylene. Air flow was the rate-limiting step early in the stripping, however slow desorption from the soil became rate-limiting as the stripping progressed. As moisture content increased the rate of removal of both contaminants decreased.

Mots clés : Groundwater — Pollution. ; Benzene — Absorption and adsorption. ; Xylene — Absorption and adsorption. ; Groundwater — Arizona — Quality.

Présentation

Version intégrale (3,67 Mb)

Page publiée le 19 mars 2018