ABSTRACT
As an alternative to reactive transport codes which require a high skill and tedious data input, 2 simple models are presented for use in artificial recharge and bank filtration. INFOMI is a finite element ID-model using ‘mixing cells in series’. It incorporates: a variable input signal; volatilization and breakdown in the infiltration basin; filtration of pollutants attached to suspended particles; and advection, dispersion, sorption and breakdown in the saturated zone. EASY-LEACHER is a 2D spread-sheet model, based on: the mass balance approach; travel times derived from a separate hydrological model; and empirical rules on reaction sequence and kinetics. The model simulates: the displacement of native groundwater; the leaching of exchangeable cations, calcite, organic matter and iron sulphides; the breakthrough of reactive solutes; and sorption and breakdown of micropollutants. The behaviour of 4 radionuclides and trihalomethanes upon artificial recharge is predicted using INFOMI. Quality changes of injected surface water when recollected by a distant well, are calculated by EASY-LEACHER.
