水力激发与表面活性剂协同修复含水层低渗透区残余相污染
- Hydrodynamic stimulation and surfactant-enhanced remediation of residual-phase pollution in low-permeability zones of aquifers
- 基金项目：国家重点研发计划资助项目(2020YFC1808300);国家自然科学基金资助项目(42007167)
- 伍世杰
- 成都理工大学地质灾害防治与地质环境保护国家重点实验室
- 付冰洁
- 成都理工大学地质灾害防治与地质环境保护国家重点实验室
- 李博文
- 成都理工大学地质灾害防治与地质环境保护国家重点实验室
- 摘要：非均质含水层低渗透区残余相有机污染物的去除是地下水污染修复的难点之一.本文旨在构建抽-注循环井水力激发协同表面活性剂增溶增流修复系统,探究水力激发下表面活性剂向含水层低渗透区的传输及修复残余相TCE效果.实验结果表明两种技术具有协同效应,循环井的水力激发作用能够在垂直地下水流方向上有效强化鼠李糖脂、槐糖脂和吐温80等表面活性剂向含水层低渗透区传输,三种表面活性剂在低渗透区的浓度超过高渗透区的40%.表面活性剂的增溶增流作用可有效强化循环井对残余相TCE的修复效果.添加鼠李糖脂、槐糖脂和吐温80后,残余相TCE分别降低至初始含量的1.5%、0%、0%.综合表面活性剂在含水层中的迁移能力、与目标污染物的相互结合能力以及增溶增流效果,吐温80耦合抽-注循环井水力激发的修复效果最佳.
- Abstract：The remediation of groundwater contamination is significantly challenged by the presence of residual phase organic pollutants in heterogeneous aquifers. The objective of this study is to develop a remediation system that involves hydraulic stimulation of the circulation well's pumping-injection groundwater, surfactant solubilization, and flow enhancement. The study investigates the transmission of surfactants to the low-permeability zone of aquifers and the remediation efficacy of residual phase TCE under hydraulic stimulation. Experimental results demonstrate that the combination of these two techniques exhibits a synergistic effect. The hydraulic stimulation of circulation well effectively enhances the transport of surfactants such as rhamnolipids, acacia glycolipids, and Tween 80 to the low-permeability zone of the aquifer in the vertical direction of groundwater flow. Notably, the concentration of three surfactants in the low-permeability zone exceeds 40% of that in the high-permeability zone. The solubilizing and flow enhancing effects of the surfactants can enhance the remediation of the residual phase TCE by the groundwater circulating well. The addition of rhamnolipid, acacia glycolipid, and Tween 80 led to a reduction of residual phase TCE to 1.5%, 0%, and 0% respectively, compared to the initial content. Considering the migration ability of surfactants in the aquifer, the mutual binding ability of surfactants and target pollutants, and the solubilization and flow-enhancing effect, Tween 80, when coupled with hydraulic stimulation of the circulation well's pumping-injection groundwater, was the most effective.
