Experimental Study of Complete Dissolution of a Nonaqueous Phase Liquid inSaturated Porous Media

摘要

The attenuation of gamma radiation was utilized to measure changing residualtrichloroethylene (TCE) saturation in an otherwise water-saturated porous medium as clean water was flushed through the medium. A front over which dissolution actively occurred was observed. Gamma attenuation measurements and analyses of effluent water samples indicate that there was minimal if any transport of TCE as colloidal droplets. Even as trapped TCE ganglia decreased in size due to dissolution, there is no evidence that they became mobile and advected downgradient. Mass transfer rate coefficients were computed and are shown to be a function of Darcy flux, TCE volumetric contents, and distance into the region of residual TCE. (Copyright (c) 1994 American Geophysical Union).