Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications

Journal of Hydrology
By: , and 

Links

Abstract

Methodologies that account for specific types of chemical reactions in the simulation of solute transport can be developed so they are compatible with solution algorithms employed in existing transport codes. This enables the simulation of reactive transport in complex multidimensional flow regimes, and provides a means for existing codes to account for some of the fundamental chemical processes that occur among transported solutes. Two equilibrium-controlled reaction systems demonstrate a methodology for accommodating chemical interaction into models of solute transport. One system involves the sorption of a given chemical species, as well as two aqueous complexations in which the sorbing species is a participant. The other reaction set involves binary ion exchange coupled with aqueous complexation involving one of the exchanging species. The methodology accommodates these reaction systems through the addition of nonlinear terms to the transport equations for the sorbing species. Example simulation results show (1) the effect equilibrium chemical parameters have on the spatial distributions of concentration for complexing solutes; (2) that an interrelationship exists between mechanical dispersion and the various reaction processes; (3) that dispersive parameters of the porous media cannot be determined from reactive concentration distributions unless the reaction is accounted for or the influence of the reaction is negligible; (4) how the concentration of a chemical species may be significantly affected by its participation in an aqueous complex with a second species which also sorbs; and (5) that these coupled chemical processes influencing reactive transport can be demonstrated in two-dimensional flow regimes. 

Publication type Article
Publication Subtype Journal Article
Title Solute transport with equilibrium aqueous complexation and either sorption or ion exchange: Simulation methodology and applications
Series title Journal of Hydrology
DOI 10.1016/0022-1694(87)90174-0
Volume 90
Issue 1-2
Year Published 1987
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 35 p.
First page 81
Last page 115
Google Analytic Metrics Metrics page
Additional publication details