Journal article
Empirical Theory of Vacuum-Assisted Steam Stripping of Organic Pollutants from Contaminated Soils
Geotechnical testing journal, v 18(1), pp 32-40
01 Mar 1995
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
A theoretical model was developed for the removal of organic chemicals from soil via vacuum-assisted steam stripping. The model considers a homogeneous, isotropic soil described by a single steam permeability coefficient. (The author realizes that this is an idealization of most field situations.) It is assumed that the entire soil mass has been steam heated to 100°C (or slightly above), so the temperature can be considered a constant for the entire decontamination process. The steady-state steam pressure and velocities are determined by solving Laplace's equation for two geometries: a circular symmetry model and a point source model (results for the latter are available upon request). One-dimensional laboratory experiments were conducted to determine the needed steam permeability and decontamination rate of a particular pollutant during steady-state steam flow. The rate of decontamination was determined over a range of steam velocities. The soils used in this particular study were 100% sand, 75% sand/25% Delaware River silt, and 50% sand/50% Delaware River silt. The "pollutant" was commercially available kerosene at a level of 5% by weight in the soil. The soil was initially moisture-free. Results are presented as the time needed to produce either 80 or 100% decontamination. These times depend on the position in the soil-the higher the steam-flow velocity, the shorter the times to decontaminate. Drawing on previous work, the times to reach steady state are also presented. For contaminated regions as large as 10 m in diameter for these three soil types, the times to decontaminate to at least 98% appear reasonable.
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Details
- Title
- Empirical Theory of Vacuum-Assisted Steam Stripping of Organic Pollutants from Contaminated Soils
- Creators
- A E Lord - Drexel University
- Publication Details
- Geotechnical testing journal, v 18(1), pp 32-40
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:A1995QM14000003
- Scopus ID
- 2-s2.0-0029273286
- Other Identifier
- 991019183978904721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Engineering, Geological
- Geosciences, Multidisciplinary