地下低渗透性介质中有机污染物去除机理研究

我国地下水的有机污染非常严重，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，但这些方法的修复效果严重依赖被污染地层介质的渗透性能，国外许多实践经验表明：在低渗透性（粉细砂、粉质、淤泥质粘土等）和非均质地层中，有机污染物的去除效果差，甚至修复技术无效。本项目研究有机污染物在地下环境低渗透性地层中的分布、迁移转化机理，为提高有机污染修复的效果奠定基础；项目通过地下水动力场、温度场、地下水化学作用、原位微生物作用来系统地研究有机污染物在低渗透性地层中的去除机理和影响因素，确定有机污染物在低渗透性地层中的“释放”机制，为有机污染物常用的修复技术（如原位空气扰动、热脱附、抽取-处理、表面活性剂强化、以及微生物修复等）的改进提供理论依据。

The groundwater organic pollution in China is very severe, so it is very important to study the remediation technologies. There are many groundwater pollution remediation methods in the world recently, but the remediation effects are severely depend upon the permeability of the contaminated geological formation. It has been indicated by practical experiences in the developed countries that the groundwater remediation had a bad effect or even failed in the lower permeable (such as fine sand, silt etc.) or heterogeneous geological formation. The major research contents for this project are as follows: the migration and transformation mechanisms of organic pollutants in lower permeable media, the release and removal mechanisms and enhancing effects of contaminated lower permeable geological formation during the groundwater remediation process, such as in situ air sparging, thermal gas treatment, pump and treat, surfactant enhanced treatment and in situ bio-remediation. This study can provide theoretical bases for enhancing the remediation effects, and improving the remediation technologies in contaminated lower permeable formation.