基于TOUGH2的挥发性有机污染场地曝气法修复设计  

Design of remediation process for volatile organic pollution sites with air sparging based on TOUGH2

作　　者：房立兴 王凯 王兔龙 许龙[2] 闫沥学 FANG Lixing;WANG Kai;WANG Tulong;XU Long;YAN Lixue(Tianjin Bochuan Geotechnical Engineering Co.,Ltd.,Tianjin 300000,China;Hefei University of Technology,Hefei 230000,China)

机构地区：[1]天津市博川岩土工程有限公司,天津300000 [2]合肥工业大学,合肥230000

出　　处：《环境工程》2025年第1期204-210,共7页Environmental Engineering

基　　金：国家重点研发计划“含裂隙低渗透地层渗透性能与非水相污染物时空传输特征”(2020YFC1808101);安徽省重点研究与开发计划项目“低渗有机污染土体原位强化曝气修复技术研究与示范应用”(2022l07020014)。

摘　　要：曝气法是处理地下水和土壤有机污染的重要技术。结合数值模拟,可对修复条件进行优化。通过TOUGH2软件的T2VOC模块模拟研究了对二甲苯在研究区域的泄露、重新分布和曝气修复过程中污染物的运移规律。结果表明:在污染物泄露过程中,非饱和带中的对二甲苯会在重力和毛细压力的作用下竖直迁移并横向扩展;饱和带中的对二甲苯主要为水平扩散,并溶于地下水;在考虑本研究区域的场地条件(土壤的渗透性和地下水位高度)的基础上,采用曝气法实施修复的最佳曝气流量为12 m3/h,最佳曝气深度为10.4 m。The air sparging method is a crucial technology for addressing organic contamination in groundwater and soil.When integrated with numerical simulation,this approach allows for the optimization of remediation conditions,thereby enhancing the effectiveness of the remediation process.This paper utilized the T2VOC module of TOUGH2 software,to simulate and investigate the transport mechanisms of para-xylene during the processes of leakage,redistribution,and air sparging remediation within a specified study area.The findings of this research indicated that during the leakage of contaminants,paraxylene in the unsaturated zone underwent vertical migration and lateral expansion due to the combined effects of gravitational and capillary forces.In contrast,para-xylene in the saturated zone primarily experienced horizontal diffusion and subsequently dissolved into the groundwater,which complicated the spread of contamination.Furthermore,by taking the specific site conditions of the study area into account,including soil permeability and groundwater level,this study identified the optimal aeration flow rate at 12 m3/h and the aeration depth at 10.4 m.These results provide significant insights into the behavior of para-xylene contaminants and contribute to the development of more effective remediation strategies for contaminated sites.Overall,this research highlighted the importance of integrating numerical modeling with traditional remediation techniques,offering a promising direction for improving the management of organic pollutants in subsurface environments.Thus,it lays a foundational understanding for future studies aimed at refining remediation practices and addressing environmental challenges related to soil and groundwater contamination.

关 键 词：曝气法 挥发性有机污染物 数值模拟 曝气参数 

分 类 号：X53[环境科学与工程—环境工程] X523