电-介协同强化O/W乳状液破乳除油机理研究

含油污水来源广泛、体量大，对环境危害大，其中水包油型（O/W）乳状液的绿色高效破乳是当前含油污水处理面临的难题之一。本项目提出电场和介质聚结协同强化O/W乳状液破乳除油的新思路，并围绕分离过程中涉及的油滴运动和聚结的科学问题展开研究，包括：1）通过油滴电流体动力学（EHD）运动的微观测试与解析，建立油滴当量电荷图谱，开发油滴EHD运动与流体流动耦合的模拟方法；2）通过电场作用下介质表面的粘附油滴形态、聚并过程及自由油滴有效碰撞动力学条件的研究，解析电-介协同强化油滴聚结机制；3）通过电-介协同破乳除油性能测试，获得各参数影响规律，结合介质流道中油滴运动的模拟研究，解析电-介协同强化油滴碰撞捕获的运动机制，并构建该体系分离性能的计算模型。项目成果可望从EHD、流体动力学和液-固界面相互作用的角度，探明电-介协同强化分离的机理，并构建一种新颖、可行的物理法高效破乳除油技术。

Oily wastewater has a wide range of sources and a large amount of production, which is extremely dangerous to the environment. Currently, the green and efficient demulsification of oil-in-water (O/W) emulsion is one of the challenge problems in the treatment of oily wastewater. This project proposes a novel method of enhanced demulsification of O/W emulsion by electric field combined with medium coalescence, and focuses on the scientific issues of oil droplet motion and coalescence involved during the separation process. Including: 1) Test and analyze the microscopic electro-hydro dynamics (EHD) motion of oil droplets, to establish an oil droplet equivalent charge map, and develop a simulation method for coupling EHD motion with fluid flow. 2) Investigate the shape and coalescence process for adhered oil droplets and the dynamic conditions of effective collision for free oil droplets on the surface of coalescence medium under the action of electric field, to clarify the mechanism of oil droplet coalescence enhanced by electric field combined with medium coalescence. 3) Test the separation performance to obtain the influence law of various parameters, combined with the simulation of oil droplet motion in the medium channel, to clarify the motion mechanism of oil droplet collision capture enhanced by electric field combined with medium coalescence, and establish a mathematic model to calculate the separation performance of the system. From the perspective of EHD, fluid dynamics and liquid-solid interface interaction, the mechanism of enhanced separation by electric field combined with medium coalescence is expected to be clarified, as well as provide a novel and feasible way for the efficient physical demulsification and oil removal technology.