HR: 10:40h
AN: H22C-02 INVITED     [Abstracts]
TI: Linking Contaminant Mass Discharge to DNAPL Source Zone Architecture and Mass Removal
AU: * Pennell, K D
EM: kurt.pennell@ce.gatech.edu
AF: Georgia Institute of Technology, School of Civil and Environmental Engineering, 311 Ferst Dr., Atlanta, GA 30332, United States
AU: Suchomel, E J
EM: eric.suchomel@gmail.com
AF: Geosyntec Consultants, 475 14th St., Suite 400, Oakland, CA 94612, United States
AU: Amos, B K
EM: benjamin.amos@ce.gatech.edu
AF: Georgia Institute of Technology, School of Civil and Environmental Engineering, 311 Ferst Dr., Atlanta, GA 30332, United States
AU: Loeffler, F E
EM: frank.loeffler@ce.gatech.edu
AF: Georgia Institute of Technology, School of Civil and Environmental Engineering, 311 Ferst Dr., Atlanta, GA 30332, United States
AU: Capiro, N L
EM: natalie.capiro@ce.gatech.edu
AF: Georgia Institute of Technology, School of Civil and Environmental Engineering, 311 Ferst Dr., Atlanta, GA 30332, United States
AB: To evaluate the relationship between partial dense nonaqueous phase (DNAPL) mass removal and plume behavior, laboratory-scale experiments were conducted in a two-dimensional aquifer cell containing a tetrachloroethene (PCE) source zone and a down-gradient plume region. PCE-DNAPL saturation distributions were quantified using a light transmission system and expressed in terms of a ganglia-to-pool (GTP) volume ratio. To achieve incremental mass removal, the aquifer cells were flushed with a 4% Tween 80 surfactant solution that increased the solubility of PCE by more than two orders-of-magnitude with minimal mobilization of entrapped PCE-DNAPL. For a ganglia-dominated source zone (GTP = 1.6) greater than 70% mass removal was required before measurable reductions in mass discharge were realized, while for pool-dominated source zones (GTP < 0.3) reductions in mass discharge versus mass removal approached a 1:1 correlation. Current experiments are designed to evaluate the potential for coupling aggressive mass removal with microbial reductive dechlorination.
DE: 0418 Bioremediation
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2007 Joint Assembly