Cation exchange in heterogeneous media
Abstract
Cation exchange is a highly non- linear reactive process involving at least two solutes and two mineral species satisfying some equilibrium conditions. Exchange of Na and H were monitored in a series of experiments carried out in a column packed with resin beads under different flow rates. The breakthrough curves for the two solutes at the outlet are non-monotonic and velocity dependent, and cannot be properly modeled by the classical reactive model based on the Gaines-Thomas convention even with velocity dependent parameters. An alternative is to model the system by means of a double porosity model where there is an exchange between the two sites and where equilibrium is achieved at both sites at a different rate. The resulting parameters can be physically explained by incomplete mass transfer processes.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.H31D1216F
- Keywords:
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- 1828 HYDROLOGY Groundwater hydraulics;
- 1009 GEOCHEMISTRY Geochemical modeling