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DENITRIFICATION IN NONHOMOGENEOUS LABORATORY SCALE AQUIFERS: 1. PRELIMINARY MODEL FOR TRANSPORT AND FATE OF A SINGLE COMPOUND
Citation:
Lindstrom, F. AND L. Boersma. DENITRIFICATION IN NONHOMOGENEOUS LABORATORY SCALE AQUIFERS: 1. PRELIMINARY MODEL FOR TRANSPORT AND FATE OF A SINGLE COMPOUND. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-90/009 (NTIS PB90186305), 1990.
Description:
A two-dimensional mathematical model for simulating the transport and fate of organic chemicals in a laboratory scale, single layer aquifer is presented. The aquifer can be nonhomogeneous and anisotropic with respect to its fluid flow properties. he physical model has open inlet and outlet ends and is bounded by impermeable walls on all sides. ully penetrating injection and/or extraction wells can be placed anywhere in the flow field. he inlet and outlet boundaries have user prescribed hydraulic pressure fields. he steady state hydraulic pressure field is obtained first by using the two-dimensional Darcy flow law and the continuity equation. he chemical transport and fate equation is then solved in terms of user stipulated initial and boundary conditions. he model accounts for the major physical processes of storage, dispersion, and advection, and also can account for linear equilibrium sorption, three first-order loss processes, including microbial degradation, irreversible sorption and/or dissolution into the organic phase, metabolisn in the sorbed state, and first order loss in the sorbed state. he chemical may be released internally via distributed leaks, sources that do not perturb the flow field, or from fully penetrating injection wells. hemical compounds may also enter at the inlet boundary. hemical mass balance type inlet and outlet boundary conditions are used.
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DENITRIFICATION IN NONHOMOGENEOUS LABORATORY SCALE AQUIFERS: 1. PRELIMINARY MODEL FOR TRANSPORT AND FATE OF A SINGLE COMPOUND