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Dissolution of a well-defined trichloroethylene pool in saturated porous media: Experimental design and aquifer characterization

Chrysikopoulos Constantinos

Πλήρης Εγγραφή

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Περίληψη

A unique three-dimensional bench-scale model aquifer is designed andconstructed to carry out dense nonaqueous phase liquid (DNAPL) pool dissolutionexperiments. The model aquifer consists of a rectangular glass tank with internaldimensions 150.0 cm length, 21.6 cm width, and 40.0 cm height. The formation of a welldefinedcircular pool with a perfectly flat pool-water interface is obtained by a bottomplate with a precise cutout to contain the DNAPL. The aquifer is packed with a wellcharacterizedrelatively uniform sand. A conservative tracer is employed for thedetermination of the longitudinal and transverse aquifer dispersivities. The dissolutionstudies are conducted using a circular trichloroethylene (TCE) pool. The sorptioncharacteristics of TCE onto the aquifer sand are independently determined from a flowthroughcolumn experiment. Steady state dissolved TCE concentrations at specificdownstream locations within the aquifer are collected under three different interstitialvelocities. An appropriate overall mass transfer coefficient is determined from each dataset. The data collected in this study are useful for the validation of numerical andanalytical DNAPL pool dissolution models.

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