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Volatile Organic Compounds Volatilization from Multicomponent Organic Liquids and Diffusion in Unsaturated Porous Media

University of Tübingen, Center for Applied Geoscience, Sigwartstrasse 10, 72076 Tübingen, Germany

View larger version (14K): [in a new window]   Fig. 1. Schematic of the experimental system.

View larger version (26K): [in a new window]   Fig. 2. Comparison of measured fluxes with the analytical solution of Fick's Second Law (Eq. [6]) for (a) pure toluene and (b) MTBE vapor diffusion in unsaturated soil with different water contents; fitted values for Deg and are given in Table 3.

View larger version (18K): [in a new window]   Fig. 3. Comparison of the experimental effective diffusion coefficients of toluene (filled symbols) and MTBE (open symbols) with values predicted by different empirical relationships (Table 1).

View larger version (34K): [in a new window]   Fig. 4. Diffusion breakthrough curves from organic mixtures. Measured data (symbols) and predictions by the numerical model (lines).

View larger version (28K): [in a new window]   Fig. 5. Comparison of normalized cumulative masses predicted by numerical modeling (lines) and experimental data (symbols). m denotes the cumulative mass diffused from the columns, and M is the mass of each compound initially present in the organic mixtures.

View larger version (28K): [in a new window]   Fig. 6. Change of the mole fraction of each compound in the multicomponent organic liquids as simulated with the model: (a) Mixture 1, (b) Mixture 2.