EFFECT OF SOIL LAYERING ON NAPL REMOVAL BEHAVIOR IN SOIL-HEATED VAPOREXTRACTION

Authors
Citation
Sw. Webb et Jm. Phelan, EFFECT OF SOIL LAYERING ON NAPL REMOVAL BEHAVIOR IN SOIL-HEATED VAPOREXTRACTION, Journal of contaminant hydrology, 27(3-4), 1997, pp. 285-308
Citations number
26
Categorie Soggetti
Water Resources","Environmental Sciences","Geosciences, Interdisciplinary
ISSN journal
01697722
Volume
27
Issue
3-4
Year of publication
1997
Pages
285 - 308
Database
ISI
SICI code
0169-7722(1997)27:3-4<285:EOSLON>2.0.ZU;2-O
Abstract
Soil heating has been proposed as a method to enhance the vapor extrac tion of NAPLs from contaminated soils. Three-dimensional fluid flow an d heat transfer simulations have been per formed for soil-heated vapor extraction to determine the transient system performance for a hypoth etical configuration. Soil layering has been considered in evaluation of the initial non-aqueous phase Liquid (NAPL) distribution and in eva poration and transport to the vapor extraction location. Results from this layered model are compared with results for a homogeneous system with an initially uniform NAPL, indicating the influence of layering, the initial NAPL distribution, the type of NAPL, and the possibility o f enhanced vapor diffusion. Not only is the NAPL removal. time reduced significantly with the addition of heat, but the uncertainty in the r emoval time owing to a number of difficult to characterize in situ fac tors, such as layering and the initial NAPL distribution, is much less than for standard soil vapor extraction without heating, owing to the rise in temperature and increase in NAPL vapor pressure with time. (C ) 1997 Published by Elsevier Science B.V.