二维流动池中NAPL-水界面面积和传质速率的测量。
Measurement of NAPL-water interfacial areas and mass transfer rates in two-dimensional flow cell.
作者信息
Li Muzi, Zhai Yuanzheng, Wan Li
机构信息
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.
College of Water Science, Beijing Normal University, Beijing 100875, China E-mail:
出版信息
Water Sci Technol. 2016 Nov;74(9):2145-2151. doi: 10.2166/wst.2016.397.
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. Fe-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 = 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.
非水相液体（NAPL）-水界面面积以及跨NAPL与水界面的传质速率通常是原位地下水污染治理中的关键因素。在本研究中，利用二维流动槽中的界面和分配示踪剂试验测量了NAPL-水界面面积和残余NAPL饱和度。将结果与之前的柱实验和现场实验结果进行了比较。此外，还研究了不同NAPL-水界面面积下的传质速率。采用铁活化过硫酸盐进行原位化学氧化修复以逐步去除NAPL。结果表明，化学氧化导致的NAPL-水界面面积以及NAPL饱和度的降低使相间传质速率呈线性下降（R = 0.97），揭示了二维系统中传质速率与界面面积之间的关系。由于NAPL向水相的传质受到控制，NAPL氧化速率随界面面积的减小而降低。
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