H43F-1561
Measuring NAPL-Water Interfacial Areas to Evaluate the Effectiveness of In-Situ Chemical Oxidation for DNAPL-Contaminated Source Zones: A Two-Dimensional Flow Cell Study
Thursday, 17 December 2015
Poster Hall (Moscone South)
Muzi Li1,2, Mark L Brusseau1,3, Ni Yan3 and Li Wan2, (1)University of Arizona, Department of Soil, Water and Environmental Science, Tucson, AZ, United States, (2)China University of Geosciences, School of Water Resources and Environment, Beijing, China, (3)University of Arizona, Department of Hydrology and Water Resources, Tucson, AZ, United States
Abstract:
In-situ chemical oxidation (ISCO) using persulfate was employed to remediate a flow cell contaminated with a model dense nonaqueous-phase liquid (DNAPL), trichloroethene (TCE). The flow cell was packed homogeneously with 359 μm diameter natural sand. Dyed TCE DNAPL was naturally distributed in the flow cell. Fe2+-activated persulfate (5 mM) was used for ISCO. Interfacial partitioning tracer tests (IPTT) were conducted before and after ISCO to measure NAPL-water interfacial area, using sodium dodecyl benzenesulfonate (SDBS, 35mg/L) as the tracer. The change in interfacial area was examined as influenced by ISCO remediation. The interfacial areas measured for this two-dimensional system are compared to previously reported values obtained from one-dimensional column experiments.
