Non-ideal Behavior During Complete Dissolution of Organic Immiscible Liquid: 2. Ideal Porous Media |
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Authors: | M K Mahal Asami Murao Gwynn R Johnson Ann E Russo Mark L Brusseau |
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Institution: | 1. School of Earth and Environmental Science, University of Arizona, 429 Shantz Building, Tucson, AZ, 85721, USA 2. Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA
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Abstract: | Column experiments were conducted using ideal natural sands and stainless-steel beads to examine the complete dissolution behavior of an organic immiscible liquid. Trichloroethene was used as the representative organic liquid. The elution curves exhibited multi-step behavior, with multiple extended periods of relatively constant contaminant flux. These secondary steady-state stages occurred at concentrations several orders-of-magnitude below aqueous solubility for the well-sorted sands. In contrast, the secondary steady-state stages occurred within 1 log of aqueous solubility for the poorly sorted sand. The non-ideal behavior is hypothesized to result from constraints to hydraulic accessibility of the organic liquid to flowing water, which may be expected to be mediated by the pore-scale configuration of the flow field and the fluid phases. |
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