The effect of temperature on adsorption of organic compounds to soils

Sleep, Brent E; McClure, Paul D
February 2001
Canadian Geotechnical Journal;Feb2001, Vol. 38 Issue 1, p46
Academic Journal
Column experiments were performed at 22–25°, 50°, and 92°C to study the effect of temperature on the sorption of toluene, perchloroethylene, and naphthalene to a silty gravel-till aquifer material. A one-dimensional numerical model incorporating kinetic adsorption with gamma-distributed rate constants was developed and fit to the data. As temperature was increased from 22–25° to 90°C, sorption coefficients decreased by 35, 40, and 60% for toluene, perchloroethylene, and naphthalene, respectively. The means and variances of the gamma distributions for sorption rate constants both increased as temperature increased. The increases in variance were attributed to the short contact times of the experiments and the increased sorption rates at higher temperatures. The decreases in sorption coefficients and increases in sorption rate constants as temperature is increased suggest that thermal remediation techniques such as hot-water and steam flushing may accelerate the removal of sorbed organic soil contamination.Key words: sorption, nonequilibrium, temperature dependence, thermal remediation.Des expériences dans des colonnes ont été réalisées à des températures de 22–25°, 50° et 92°C pour étudier l'effet de la température sur l'adsorption de toluène, de perchloroéthylène, et de naphtalène sur un till de gravier limoneux de l'aquifère. Un modèle numérique unidimensionnel incorporant l'adsorption cinétique avec des constantes de vitesse de gamma distribué a été développé et collé aux données. À mesure que la température a été accrue de 22–25° à 90°C, les coefficients d'adsorption ont été diminués de 35 %, 40 % et 60 % pour le toluène, le perchloroéthylène et le naphtalène respectivement. Les moyennes et variances des distributions gamma pour les constantes de vitesse de sorption se sont toutes deux accrues alors que la température augmentait. Les augmentations de la variance ont été attribuées aux courts laps de temps de contact des expériences et à l'accroissement des vitesses de sorption aux températures plus élevées. Les diminutions des coefficients de sorption et les augmentations des constantes de vitesse de sorption alors que la température augmente suggère que les techniques de remédiation thermique telles que le nettoyage à grande eau et à la vapeur peuvent accélérer l'enlèvement de la contamination du sol par sorption organique.Mots clés : sorption, nonéquilibre, dépendance à la température, remédiation thermique.[Traduit par la Rédaction]


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