Soil clean up by in-situ aeration. I. Mathematical modeling
Mathematical models are developed suitable for use in evaluating the feasibility of in-situ vapor stripping approaches for selected chemicals and site-specific environments. These models simulate the operation of both laboratory soil stripping columns and field-scale vacuum extraction wells (vent pipes). The effect of an anisotropic Darcy's constant is examined and the compressibility of the extracting gas is taken into account. The models incorporate the assumption of local equilibrium for the volatile compounds between the condensed and vapor phases. These models may use Henry's law or more complex isotherms for this equilibrium. A method is developed for calculating Henry's constant from field analytical data, and it is noted that use of Henry's constants calculated from laboratory data on solutions of volatile solutes in pure water can lead to very serious errors. It is shown that evacuation wells should be screened only down near the impermeable layer beneath the zone of stripping (unsaturated zone) for most efficient functioning.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (USA)
- OSTI ID:
- 6248255
- Journal Information:
- Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 21:10-11; ISSN ANALB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105 -- Separation Procedures
510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION ISOTHERMS
AERATION
CALCULATION METHODS
CHEMISTRY
DATA
DESIGN
DISPOSAL WELLS
EQUATIONS
EQUILIBRIUM
FLUID FLOW
GAS FLOW
GROUND DISPOSAL
IN-SITU PROCESSING
INFORMATION
ISOTHERMS
LAND POLLUTION
MANAGEMENT
MATERIALS
MATHEMATICAL MODELS
MATTER
NUMERICAL DATA
PIPES
POLLUTANTS
POLLUTION
PREDICTION EQUATIONS
PROCESSING
SOIL CHEMISTRY
SOILS
STEAM STRIPPING
THEORETICAL DATA
TOXIC MATERIALS
VENTS
VOLATILE MATTER
VOLATILITY
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PROCESSING
WATER TREATMENT
WELLS