HR: 1340h
AN: H23A-1413    [Abstracts]
TI: Experimental Investigation of DNAPL Mass Flux Reduction as a Function of Source Zone Mass Removal
AU: * DiFilippo, E L
EM: edifilip@hwr.arizona.edu
AF: University of Arizona, Department of Hydrology and Water Resources 1133 E. North Campus Drive Harshbarger Building, P.O. Box 210011, Tucson, AZ 85721 United States
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: University of Arizona, Department of Soil, Water and Environmental Science P.O. Box 210038, Tucson, AZ 85721-0038 United States
AU: Brusseau, M L
EM: brusseau@ag.arizona.edu
AF: University of Arizona, Department of Hydrology and Water Resources 1133 E. North Campus Drive Harshbarger Building, P.O. Box 210011, Tucson, AZ 85721 United States
AU: Oostrom, M
EM: mart.oostrom@pnl.gov
AF: Pacfic Northwest National Laboratory, Environmental Technology Division, Richland, WA 99352
AU: Wietsma, T W
EM: wietsma@pnl.gov
AF: Pacific Northwest National Laboratory, Environmental Molecular Science Laboratory, Richland, WA 99352 United States
AB: Several in-situ technologies have been developed for the remediation of DNAPL source zones (e.g., surfactant/cosolvent flushing, chemical oxidation). Generally, the application of such technologies results in mass reduction, rather than complete mass removal. Determining the relationship between mass flux reduction and source zone mass removal can support the cost benefit analysis of partial source zone mass removal. Intermediate-scale flow cell dissolution experiments were conducted using silica sands and carbon tetrachloride to investigate this relationship. Source zones comprised of either residual or pooled DNAPL in physically heterogeneous systems were examined. The mass flux of contaminant down gradient of the source zone was monitored by measuring effluent concentration and flow rate at eight discrete vertical locations. These eight outlet ports provide a depth concentration profile for the total outflow. In-situ DNAPL saturations were obtained from dual-energy gamma radiation measurements taken throughout the course of the experiments.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: Fall Meeting 2005