Titre :
|
Nonlinear sorption and nonequilibrium solute transport in aggregated porous media: Experiments, process identification and modeling
|
Auteurs :
|
C. Fesch ;
W. Simon ;
S. Haderlein ;
AL Et
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1998
|
Format :
|
p. 373-407
|
Langues:
|
= Anglais
|
Catégories :
|
HYDROLOGIE ET HYDRAULIQUE
|
Mots-clés:
|
SOLUTE
;
TRANSPORT DE CONTAMINANT
;
MILIEU POREUX
;
AGREGAT
;
SORPTION
;
ARGILE
;
MATIERE ORGANIQUE
|
Résumé :
|
The combined effects of nonlinear sorption, nonequilibrium mass transfer and the distribution of sorption sites on transport of organic contaminants has been examined in porous media containing aggregates of clay minerals and organic matter as sorbents. The major goal was to develop general concepts for describing, deterministically, the transport processes of solutes with different adsorption characteristics in such systems. Various sets of batch adsorption and miscible displacement experiments were performed covering a wide range of time scales and other experimental conditions. Using a multiple reactive tracer approach, independent information was obtained on the hydrodynamic properties of the columns, on the relative importance of the two different sorbents present, and on the accessibility and the distribution of these sorbents at the pore scale. The breakthrough curves (BTCs) of the nonlinearly sorbing tracer generally exhibited sharp fronts and excessive tailing, consistent with the Langmuir-Freundlich type adsorption at clays.
|
Source :
|
Journal of Contaminant Hydrology, vol.31
|