Measurement of NAPL-water interfacial areas and mass transfer rates in two-dimensional flow cell

作者：Li, Muzi; Zhai, Yuanzheng^*; Wan, Li

来源：Water Science and Technology, 2016, 74(9): 2145-2151.

DOI：10.2166/wst.2016.397

• chemical remediation
• flow cell
• interfacial area
• mass transfer
• NAPL

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 (R-2 = 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.

• 出版日期2016-11
• 单位中国地质大学（北京）; 北京师范大学