The application of surfactant-enhanced air sparging (SEAS) in heterogeneous aquifers has received increasing attention. In this study, a two-dimensional laboratory visualization device was used to study the migration and distribution mechanism of airflow and the nitrobenzene removal effect in an aquifer with a low-permeability lens during AS and SEAS. Experimental results showed that the surfactant significantly reduced the blocking effect of the geological interface on airflow, and the ΔP_e (the air entry pressure difference between the background media and the lens) value of the geological interface decreased from 1.1 kPa to 0.3 kPa when the surfactant concentration was 800 mg/L. When the surfactant injection location was at the center of the lens and the injection volume was 1 PV (pore volume of the lens), part of the airflow entered the lens through its below interface, which clearly improved the nitrobenzene removal inside and above the lens compared with AS remediation. However, when SEAS remediation was 24 h, the surfactant redistribution caused by air sparging resulted in the airflow entering the lens to bypass the lens again, which changed the spatial distribution of airflow rate and was not conducive to the continuous removal of nitrobenzene inside the lens.

表面活性剂增强空气喷射（SEAS）在非均质含水层中的应用越来越受到关注。本研究利用二维实验室可视化装置研究了低渗透透镜含水层中 AS 和 SEAS 过程中气流的迁移和分布机理以及硝基苯的去除效果。实验结果表明，表面活性剂显着降低了地质界面对气流的阻挡作用，ΔP _e当表面活性剂浓度为 800 mg/L 时，地质界面的（背景介质与透镜的进气压力差）值从 1.1 kPa 下降到 0.3 kPa。当表面活性剂注射位置在镜片中心且注射体积为1 PV（镜片的孔体积）时，部分气流通过镜片下方界面进入镜片，明显提高了镜片内部和上方的硝基苯去除率与 AS 修复相比。但当 SEAS 修复 24 h 时，空气喷射引起的表面活性剂重新分布导致进入镜片的气流再次绕过镜片，改变了气流速度的空间分布，不利于镜片内硝基苯的持续去除。 .