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Non-ideal Behavior During Complete Dissolution of Organic Immiscible Liquid: 2. Ideal Porous Media

Author:
Mahal, M. K., Murao, Asami, Johnson, Gwynn R., Russo, Ann E., Brusseau, Mark L.
Source:
Water, air, and soil pollution 2010 v.213 no.1-4 pp. 191-197
ISSN:
0049-6979
Subject:
porous media, sand, solubility, stainless steel, water flow
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.
Agid:
506100