污染含水层原位空气扰动修复增强机理研究

我国地下水的有机污染非常严重，且污染物的数量和种类仍在不断的增加，研究地下水有机污染的修复方法和技术至关重要。目前，国际上有许多地下水污染修复的方法和技术，其中原位空气扰动是应用最广泛、效果好的地下水有机污染修复技术,但由于含水层介质的复杂性等原因，该技术目前主要是根据经验来进行修复系统方案的设计和运行，影响了修复技术的优化应用。本项目研究LNAPL与DNAPL污染物共存条件下，污染物在均质、非均质含水层中的迁移转化机理，明确污染物的分布特点和变化规律，为提高原位空气扰动修复的效果奠定基础。通过原位空气扰动修复中气体在含水层中分布规律及影响因素的研究，为解决含水层中气体难以预测的问题提供理论依据；通过循环井修复的研究，确定地下水循环中污染物的去除机理及修复效果增强作用，为污染含水层循环井修复效果的提高奠定基础。

The groundwater organic pollution in China is very severe, the types of pollutants are increasing continuously, so it is very important to study the remediation technologies. There are many groundwater pollution remediation methods in the world recently, among them, In situ air sparging (IAS) is one of the most widely practiced remediation technologies for NAPL contamination today. However, the design and operation of this technology is mainly based on the experiences at present because of the complexity of aquifer media and other influencing factors, which has limited the optimal operation of IAS. .The major research contents for this project are as follows: the migration and transformation mechanisms of pollutants with LNAPL and DNAPL coexistence in the homogenous and heterogeneous aquifer media, the air distribution and influencing factors in the contaminated aquifer during the IAS operation, the removal mechanisms and enhancing effects of circulation remediation well. This research aim for understanding the distribution rules for the coexistence of LNAPL and DNAPL in the aquifer media, studying the influencing factors for air distribution during IAS, and analyzing and discussing the removal mechanisms and enhancing effects of circulation remediation well technology. The study can provide theoretical bases for IAS and circulation well remediation.