RT3D is a software package for simulating three-dimensional, multispecies, reactive transport in groundwater. The code is based on the 1997 version of MT3D (DOD_1.5), but has several extended reaction capabilities. RT3D can accommodate multiple sorbed and aqueous phase species with any reaction framework that the user wishes to define. With a variety of preprogrammed reaction packages and the flexibility to insert user-specific kinetics, RT3D can simulate a multitude of scenarios. For example, natural attenuation processes can be evaluated or an active remediation can be simulated. Simulations could potentially be applied to scenarios involving contaminants such as heavy metals, explosives, petroleum hydrocarbons, and/or chlorinated solvents. RT3D is highly flexible. The users can enter their own reaction kinetic expressions or choose from a suite of eight preprogrammed reaction packages. Preprogrammed packages include: (1) Two Species Instantaneous Reaction (Hydrocarbon and Oxygen); (2) Instantaneous Hydrocarbon Biodegradation Using Multiple Electron Acceptors (O2, NO3-, Fe2+, SO42-, CH4); (3) Kinetically Limited Hydrocarbon Biodegradation Using Multiple Electron Acceptors (O2, NO3-, Fe2+, SO42-, CH4); (4) Kinetically Limited Reaction with Bacterial Transport (Hydrocarbon, Oxygen, and Bacteria); (5) Non-Equilibrium Sorption/Desorption (can also be used for Non-Aqueous Phase Liquid Dissolution); (6) Reductive, Anaerobic Biodegradation of PCE/TCE/DCE/VC; and (7) Combination of #3 and #7.
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