Abstract
In order to study dissolution kinetics of dense non-aqueous-phase liquids (DNAPL's), a procedure was developed to create a DNAPL pool at the bottom of a specially designed experimental aquifer. The aquifer was housed in an all glass rectangular tank with internal dimensions 75 cm × 21.1 cm × 36.8 cm. The tank was equipped with sampling ports, inlet and outlet wells, constant-head reservoirs, and pumps for full hydraulic control. The pool was formed inside a 27.9 cm × 18 cm × 4.7 cm internal dimensions glass pan containing a gravel layer 1.6 cm thick at the bottom and the remainder filled with aquifer sand. The pools formed had a distinct, but not perfectly flat upper surface. The fraction of sand penetrated by DNAPL was larger at elevations closer to the bottom of the tank. Dissolution experiments, using TCA and mixture of TCE and TCA pools, resulted in aqueous concentrations much lower than the respective solubility. Pulsed pumping increased the respective aqueous concentrations by a factor of ≈ 6.
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