National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai 200237, PR China.
National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai 200237, PR China.
J Hazard Mater. 2021 Jun 15;412:125188. doi: 10.1016/j.jhazmat.2021.125188. Epub 2021 Jan 21.
Oil pollution from produced water in the offshore petroleum industry is one of the most serious marine pollutants worldwide, and efficient separation technology is crucial for the control of oil pollutant emission. Medium coalescence is an efficient oil-water separation technology, but its theory is lacking and the development is slow. In this work, the microscopic mechanism of fiber coalescence was revealed, and found that the effective collision positions were the three-phase contact line and the exposed fiber surface. Further, a theoretical model for calculating the separation performance of a fiber bed was established. For a given inlet droplet size distribution and bed geometric parameters, the outlet droplet size distribution and the total separation efficiency of the fiber bed can be predicted. Then, an Ω-shaped woven method composed of oil-wet fibers and oil-phobic fibers was designed and the separation performance of the fiber beds prepared by the method and the influence law of various parameters were clarified through macroscopic experiment. Finally, the novel technology achieved its first engineering application on an offshore platform, with the average oil content of the outlet was less than 25 mg/L, which could reform the current treatment process of produced water.
海上石油工业生产水中的石油污染是全球最严重的海洋污染物之一，因此高效的分离技术对于控制油污染物的排放至关重要。介质聚结是一种有效的油水分离技术，但它的理论基础尚不完善，发展较为缓慢。在这项工作中，揭示了纤维聚结的微观机理，发现有效的碰撞位置是三相接触线和暴露的纤维表面。进一步，建立了计算纤维床分离性能的理论模型。对于给定的入口液滴尺寸分布和床体几何参数，可以预测纤维床的出口液滴尺寸分布和总分离效率。然后，设计了一种由亲油纤维和疏油纤维组成的Ω形编织方法，并通过宏观实验阐明了该方法制备的纤维床的分离性能及其各种参数的影响规律。最后，该新技术在海上平台上首次实现了工程应用，出口油含量平均低于 25mg/L，有望改变当前生产水的处理工艺。
