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Talk Abstract
Integration of Laboratory Studies and Simulation Tools for Design and Operation of In Situ Bioremediation

Brent M. Peyton
Center for Multiphase Environmental Research, Washington
State University
Pullman, WA 99164-2710
bmpeyton@che.wsu.edu
http://www.cmer.wsu.edu/~bmpeyton/

A simulation model was developed in support of an in situ bioremediation demonstration at the DOE Hanford site in Washington state. Laboratory tests were used to help define field-scale nutrient addition strategies for co-metabolic in situ biodegradation of tetrachloromethane under denitrification conditions using acetate as the substrate. The models, calibrated with bench- and field-scale data, were used to answer field-scale system design and operation questions. The field demonstration was completed in the spring of 1996 using a two-well injection/extraction groundwater recirculation system. Pulsed nutrient injection strategies were successfully used to distribute biomass away from the injection well to maximize the zone of active contaminant destruction. Co-metabolic tetrachloromethane destruction was sustained during the 4 month demonstration. Measured and simulated results are reported.

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