Evaluation of the FASTCHEM Model for Predicting Leachate Attenuation at Fossil Power Plants

by Charles E. Bohac, Tennessee Valley Authority, Chattanooga, United States,
Steven C. Young, Tennessee Valley Authority, Chattanooga, United States,



Document Type: Proceeding Paper

Part of: Symposium on Ground Water

Abstract: The Tennessee Valley Authority (TVA) has applied the model FASTCHEM to identify retardation mechanisms and predict solute transport at two fossil power plants. FASTCHEM (acronym for fly ash and flue gas desulfurization sludge transport and geochemistry) was developed to model the adsorption, ion exchange, and precipitation of major anions, major cations, and heavy metals in a two-dimensional groundwater flow regime. The capacity of the soil to attenuate leachate components was modelled at two power plants. Predictions show significant precipitation of barium, and adsorption and ion exchange for cadmium, chromium, and zinc. Several critical details in applying FASTCHEM are addressed.

Subject Headings: Power plants | Leachates | Hydrologic models | Computer models | Two-dimensional models | Gas flow | Federal government | Fly ash | North America | Tennessee | United States

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