ABSTRACT
A flexible numerical reactive transport model is developed that uses MT3D96 as advection/disersion transport code. The macro groundwater chemistry is modelled with a multiple solute version of MT3D96 coupled to a biodegradation module and/or PHREEQC. Two preprocessors for microcontaminants are developed that calculate process parameters from macro groundwater composition together with aquifer sediment composition. Application of the model to two field studies shows the flexibility of the model for case studies, but also some problems with modelling of redox processes when the coupling between MT3D96 and PHREEQC is used.
