This study investigated the influence of groundwater salinity on DNAPL migration and distribution in saturated physically homogeneous and heterogeneous porous media. Interfacial tension (IFT) of PCE/aqueous phase containing NaCl and contact angles through the aqueous phase measured results showed that the contact angle decreased and IFT increased with NaCl concentration, leading to the fact that the wettability of quartz sand can be changed from water-wet to strong water-wet. Three sets of two-dimensional (2-D) sandbox experiments conducted with different salinity showed DNAPL migrated faster in the vertical direction in salinity, yielding decreased residual DNAPL entrapped in the migration path. In addition, the salinity-induced strong water-wet media promoted DNAPL trapping at relatively lower saturation both in the coarse or medium sand, and the volume of PCE entrapped as ganglia increased in the salinity cells. The salinity enhanced the dissolution of PCE from the source zone due to the PCE zone architecture change.

中文翻译：

---

饱和多孔介质中盐水流影响的 DNAPL 迁移和分布模式产生更高的质量通量


本研究研究了地下水盐度对饱和物理均质和非均质多孔介质中 DNAPL 迁移和分布的影响。 PCE/含NaCl水相的界面张力(IFT)和通过水相测量的接触角结果表明，随着NaCl浓度的增加，接触角减小，IFT增大，导致石英砂的润湿性可以从水-湿至强水湿。在不同盐度下进行的三组二维 (2-D) 沙箱实验表明，DNAPL 在盐度垂直方向上迁移得更快，从而减少了迁移路径中残留的 DNAPL。此外，盐度诱导的强水湿介质促进了粗砂或中砂中 DNAPL 在相对较低饱和度下的捕获，并且盐度细胞中神经节捕获的 PCE 体积增加。由于 PCE 区域结构的变化，盐度增强了源区域中 PCE 的溶解。