2-DIMENSIONAL GROUNDWATER TRANSPORT OF REACTIVE SOLUTES WITH COMPETITIVE ADSORPTION

Chemical contamination of groundwater is typically associated with mul ticomponent solutions, the migration of which is affected by preferent ial adsorption and solution reactions. Transport models should, theref ore, account for advection and dispersion and for the reactions in the solution and on the solid phase. The two-dimensional model METLI has been developed for the personal computer (PC) simulation of groundwate r transport with competitive adsorption of a three-species system cons isting of a metal, a ligand, and their dominant complex at a given pH. The model structure, which employs spatial and process splitting algo rithms, is described. One- and two-dimensional application examples ar e used to demonstrate how chemical reactivity and affinity for adsorpt ion of a species, adsorption capacity of soil, and the number of the a dsorbing species affect pollutant plumes in groundwater. The model exe cutes rapidly on PCs using grids of several hundred nodes.