Influence of viscous and buoyancy forces on the mobilization of residual tetrachloroethylene during surfactant flushing

Article Abstract:

The onset and extent of tetrachloroethylene (PCE) mobilization in four size fractions of Ottawa sand during surfactant flushing is examined through column experiments. The interfacial tension between residual PCE and the aqueous phase was lowered to 0.09 dyn/cm. from 47.8 dyn/cm. by flushing with different surfactant solutions to induce mobilization. A total trapping number that incorporates both viscous and buoyancy forces is used to express PCE desaturation curves. Findings indicate the potential input of buoyancy forces to PCE mobilization. They also offer a novel technique for predicting nonaqueous phase liquid displacement during surfactant flushing.

Viscosity, Surface active agents, Hydrodynamics, Vinyl chloride

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Pyrene sorption by water-soluble organic carbon

Article Abstract:

The potential of natural dissolved organic matter for facilitating the transport of nonionic organic compounds (NOC) is discussed. Fluoresence-quenching spectroscopy was used to quantify the interactions between pyrene and ultrafiltration fractions of water-soluble organic carbon, humic acid and fulvic acid. Results indicate that NOC transport is largely influenced by the presence of colloidal organic matter suspended in the soil solution.

Usage, Carbon

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Vapor-phase sorption of p-xylene and water on soils and clay minerals

Article Abstract:

Water vapors and p-xylene compete for adsorption in soil and clay minerals. Nonpolar organic vapors' adsorption by hydrated soil must be characterized in multimechanistic terms. Data on adsorption rates should be given by mineral content, gas-liquid interface, dissolution into adsorbed water and partitioning into soil organic matter.

Gases, Gas absorption, Gas adsorption, Xylene, Xylenes, Water vapor, Atmospheric, Atmospheric water

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