title: Measurement of NAPL-water interfacial areas and mass transfer rates in two-dimensional flow cell.
abstract: The nonaqueous-phase liquid (NAPL)-water interfacial area and the mass transfer rate across the NAPL and water interface are often key factors in in situ groundwater pollution treatment. In this study, the NAPL-water interfacial area and residual NAPL saturation were measured using interfacial and partitioning tracer tests in a two-dimensional flow cell. The results were compared with previous column and field experiment results. In addition, the mass transfer rates at various NAPL-water interfacial areas were investigated. Fe2+-activated persulfate was used for in situ chemical oxidation remediation to remove NAPL gradually. The results showed that the reduction of NAPL-water interfacial areas as well as NAPL saturation by chemical oxidation caused a linear decrease in the interphase mass transfer rates (R2= 0.97), revealing the relationship between mass transfer rates and interfacial areas in a two-dimensional system. The NAPL oxidation rates decreased with the reduction of interfacial areas, owing to the control of NAPL mass transfer into the aqueous phase.
authors.affiliation: School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China; Department of Soil, Water and Environmental Science, University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: Muzi
authors.initials: M
authors.lastname: Li
authors.affiliation: College of Water Science, Beijing Normal University, Beijing 100875, China E-mail: diszyz@163.com.
authors.forename: Yuanzheng
authors.initials: Y
authors.lastname: Zhai
authors.affiliation: School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wan
mesh_terms: D060587:Groundwater / Q000737:chemistry; D010084:Oxidation-Reduction; D014867:Water / Q000737:chemistry*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water