Transport of Volatile Organic Compounds (VOCs) Through a Clay Liner

by Jae K. Park, Univ of Wisconsin-Madison, Madison, United States,
Tuncer B. Edil, Univ of Wisconsin-Madison, Madison, United States,
P. M. Berthouex, Univ of Wisconsin-Madison, Madison, United States,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract:

A series of tests have been performed using laboratory-scale flexible wall permeameters. A synthetic organic leachate mixture of methylene chloride, toluene, and trichloroethylene (TCE) along with potassium bromide was permeated to assess the effects of hydraulic gradient, hydrodynamic dispersion coefficient, and retardation on the movement of VOCs through a compacted clay. Hydraulic gradients of 0 and 67 were used. The diffusion coefficients were about two orders of magnitude smaller than the hydrodynamic dispersion coefficients. A mathematical model demonstrated that the clay with 1% organic carbon could retard the movement of toluene and TCE 5 to 8 times more than that with 0.1% organic carbon.

Subject Headings: Clay liners | Clays | Soil mixing | Volatile organic compounds | TCE | Hydraulic gradients | Permeability (soil)

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