Sorption and transport kinetics of a nonionic surfactant through an aquifer sediment
Article Abstract:
The feasibility of using surfactant solutions to remove organic contaminants from soils and aquifer sediments was evaluated by means of an empirical model. Experiments were performed to determine the transport kinetics of a nonionic surfactant in sand and soil columns. The model was then used to analyze the sorption reaction between the surfactant and the organic contaminants in the columns. Results indicate that the use of nonionic surfactants could lead to the formation of a residual sorbed surfactant mass which cannot be removed easily by flushing.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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Response to comment on 'Field-Scale Transport of Nonpolar Organic Solutes in 3-D Heterogenous Aquifers'
Article Abstract:
The criticisms leveled at the Cushey and Rubin model on the transport of nonpolar organic solutes in heterogenous aquifers regarding the conversion of the spherical diffusion model into a liner driving force model has its basis on the work of Haggerty and Gorelick (1995), wherein a more realistic assumption of the diffusion process is utilized in the model. The criticisms regarding the extrapolation of coefficients used in the Cushey and Rubin model has its basis in upscaling, and the scientific basis for the procedure.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Moisture effects on the cleanup of PAH-contaminated soil with dense carbon dioxide
Article Abstract:
Both continuous and discontinuous addition of water increase considerably the extraction of polycyclic aromatic hydrocarbons (PAHs) from soil with supercritical carbon dioxide. The remarkable extraction yield is achieved by altering the adsorption behavior of PAHs on soil. This was gleaned from an examination of moisture effects on the clean-up of soils contaminated with organics by extraction with dense carbon dioxide. Results also show that the extraction is limited by adsorption effects, rather than by diffusion.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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