Nonideal behavior during complete dissolution of organic immiscible liquid 1. Natural porous media

Experiments were conducted to investigate the complete dissolution of organic immiscible liquid residing within natural porous media. Organic-liquid dissolution was investigated by conducting experiments with homogeneously packed columns containing a residual saturation of organic liquid (trichloroe...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-12, Vol.172 (1), p.208-213
Main Authors: RUSSO, A. E, MAHAL, M. K, BRUSSEAU, M. L
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Carbon - chemistry
Chemical engineering
Environmental Monitoring - methods
Environmental Pollutants
Exact sciences and technology
Groundwaters
Heat and mass transfer. Packings, plates
Hydrodynamics of contact apparatus
Natural water pollution
Organic Chemicals - chemistry
Particle Size
Permeability
Pollution
Porosity
Soil Pollutants
Solubility
Trichloroethylene - chemistry
Water Movements
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water treatment and pollution
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Summary:Experiments were conducted to investigate the complete dissolution of organic immiscible liquid residing within natural porous media. Organic-liquid dissolution was investigated by conducting experiments with homogeneously packed columns containing a residual saturation of organic liquid (trichloroethene). The porous media used comprised different textures (ranges of particle-size distributions) and organic-carbon contents. The dissolution behavior that was observed for the soil and aquifer sediment systems deviated from the behavior typically observed for systems composed of ideal sands. Specifically, multi-step elution curves were observed, with multiple extended periods of relatively constant contaminant flux. This behavior was more pronounced for the two media with larger particle-size distributions. Conversely, this type of dissolution behavior was not observed for the control system, which consisted of a well-sorted sand. It is hypothesized that the pore-scale configuration of the organic liquid and of the flow field is more complex for the poorly sorted media, and that this greater complexity constrains dissolution dynamics, leading to the observed nonideal behavior.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.06.160