scholarly journals Remediation of sandy soils contaminated with hydrocarbons and halogenated hydrocarbons by soil vapour extraction

2012 ◽  
Vol 104 ◽  
pp. 195-201 ◽  
Author(s):  
José Tomás Albergaria ◽  
Maria da Conceição M. Alvim-Ferraz ◽  
Cristina Delerue-Matos
Keyword(s):  
Sandy Soils ◽  
Halogenated Hydrocarbons ◽  
Soil Vapour Extraction ◽  
Vapour Extraction

Effects of a semipervious lens on soil vapour extraction

1997 ◽  
Vol 341 ◽  
pp. 385-413 ◽  
Author(s):  
CHIU-ON NG ◽  
CHIANG C. MEI
Keyword(s):  
Soil Layer ◽  
Coarse Sand ◽  
Retardation Factor ◽  
Vapour Transport ◽  
Volatile Chemicals ◽  
Immobile Water ◽  
Volatile Organic Chemicals ◽  
Soil Vapour Extraction ◽  
Highly Porous ◽  
Vapour Extraction

We describe a theory for the removal of volatile organic chemicals from an unsaturated soil stratum consisting of highly porous coarse sand layers sandwiching a thin and semipervious lens. Each soil layer is modelled as a periodic array of spherical aggregates formed by solid grains and immobile water trapped by surface tension. Volatile chemicals are vaporized in the mobile air in pores between aggregates, dissolved in the intra-aggregate water, and adsorbed on the surface of soil grains. Using the effective transport equations derived for the aggregated soils, we consider shallow layers with sharp contrast in physical properties. An asymptotic analysis is developed for an axisymmetric geometry, yielding quasi-one-dimensional governing equations for individual layers. At the leading order the flow and the vapour transport are horizontal in the coarse layers but vertical in the semipervious lens. Numerical results are presented for a simple example to demonstrate the significance of the lens permeability, diffusivity and retardation factor, and the aggregate diffusivity in the coarse layers, on the vapour transport during the stages of contamination and air-venting.

Composite analytical solutions for a soil vapour extraction system

2007 ◽  
Vol 21 (11) ◽  
pp. 1506-1516 ◽  
Author(s):  
Jui-Sheng Chen ◽  
Ching-Ping Liang ◽  
Chih-Yu Chen ◽  
Chen-Wuing Liu
Keyword(s):  
Analytical Solutions ◽  
Extraction System ◽  
Soil Vapour Extraction ◽  
Vapour Extraction
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