2005 Salt Lake City Annual Meeting (October 16–19, 2005)

Paper No. 12
Presentation Time: 4:40 PM


FANG, Yilin, Pacific Northwest National Laboratory, P.O. Box 999 MS K9-36, Richland, WA 99352, SCHEIBE, Timothy D., Pacific Northwest National Laboratory, P.O. Box 999, MSIN K9-36, Richland, WA 99352, RODEN, Eric E., Geology and Geophysics, University of Wisconsin, 1215 W. Dayton St, Madison, WI 53706 and BROOKS, Scott C., Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS 6038, Oak Ridge, TN 37831, yilin.fang@pnl.gov

Field-scale simulations involving multiple terminal electron accepting processes (TEAPs) and abiotic processes are often limited by reaction parameterization and complexity associated with heterogeneous groundwater flow. We have constructed a 3D field-scale groundwater flow and multicomponent reactive transport model that incorporates multiple TEAPs obtained from a batch TEAP model which has been successfully formulated and used to simulate laboratory experimental observations. Field-scale simulation is conducted using the reaction system and parameters derived from the batch TEAP model and the conceptual model and hydrologic parameters estimated from the results of pumping tests and water level monitoring and model interpretation of a tracer test conducted in August 2004 for a highly heterogeneous surficial aquifer near Oak Ridge, TN. Preliminary simulations are used to understand field-scale processes and evaluate alternative experimental designs involving injection of ethanol to stimulate microbial reduction of uranium and precipitation of U(IV) minerals.