天然水动力影响下的纳米乳化油孔隙传质机理研究

纳米乳化油作为一种地下水原位生物修复的新型液态碳源，因其具有廉价、无毒和缓释长效等特性而备受关注。但在实际应用中，纳米乳化油在多孔介质中的残留分布和传质决定了其能否与目标污染物充分接触反应，从而影响污染物去除效率。本研究以纳米乳化油残留和传质过程为研究对象，综合利用X射线微断层扫描、三维重构以及微流成像等技术手段，定量描述天然水动力条件下纳米乳化油在孔隙结构中残留形态形成、转化和消失的动态变化过程。在此基础上，考察不同残留形态纳米乳化油的传质动力学特征，评估传质效率和有效寿命，厘清纳米乳化油残留形态与传质效率以及有效寿命的关系；分析天然水动力作用下纳米乳化油残留形态变化和传质的主控因素，揭示纳米乳化油残留和传质的机理。预期研究结果不仅可以从根本上认识纳米乳化油的残留和传质规律，还将为地下水中污染物的去除提供必要支撑。

As a new type of liquid carbon source for in-situ bioremediation of groundwater, nano-emulsified vegetable oil (NEVO) has attracted much attention due to its cheap, non-toxic, and long-term slow-release characteristics. However, in practical application, the residual distribution and mass transfer of NEVO in porous media determine whether it can fully contact and react with target pollutants, thereby affecting the amount of pollutants removal efficiency. This study will intend to characterize the residual and mass transfer process of NEVO in porous media. The X-ray micro-tomography, three-dimensional reconstruction, and microfluidic imaging technical method will be comprehensively used. The pore scaled dynamic changes of the formation, transformation, and disappearance of NEVO residual morphology will be quantitatively studied under natural hydrodynamics. On this basis, the mass transfer kinetic characteristics of different NEVO residual morphology will be investigated. The relationship among the residual morphology of NEVO, mass transfer efficiency, and longevity will be clarified based on the evaluation of mass transfer efficiency and longevity. The predominated factors affecting the residual and mass transfer of NEVO will be analyzed to reveal the residual and mass transfer mechanism of NEVO under natural hydrodynamics. It is expected that the research results can not only fundamentally understand the residual and mass transfer laws of NEVO, but also provide necessary support for the removal of pollutants in groundwater.