基于CFD的单根中空纤维膜丝管通量分布特性研究

Research on Hollow Fiber Membrane Wastewater Treatment Characteristics Based on CFD Method and Fluent Software

摘要: 膜污染制约了MBR处理效率和应用效果，因此利用CFD和Fluent软件深入开展MBR污水处理特性优化研究对于减缓膜污染现象具有重要的实际意义。本文基于计算流体力学(CFD)方法并使用Fluent软件建立了单根中空纤维膜丝管的仿真模型，划分了仿真模型的网格，设置了模型的边界条件，轴向仿真了单根中空纤维膜丝管CFD模型，分析研究了膜丝管的膜通量分布特性，仿真结果证实，当加大膜丝管内某一部分的膜通量时，该部位膜丝的高通透指数会增加，从而使单根中空纤维膜丝管产生贯穿整体的跨膜压差，这一压强差会导致膜丝管通量的不均匀分布，从而影响单根中空纤维膜丝管的能源使用效率。

Abstract: In the field of sewage treatment, membrane fouling has always been an important factor restricting MBR treatment efficiency and application effect. Therefore, it is of great practical significance to conduct indepth research on the optimization of MBR wastewater treatment characteristics by using CFD and Fluent software to slow down the membrane pollution phenomenon. Based on computational fluid dynamics (CFD) method and Fluent software, this paper established simulation models for the single hollow fiber membrane filament and set boundary conditions. The CFD model of single hollow fiber membrane filament was axially simulated and the characteristics of membrane flux distribution were analyzed. Simulation results confirm that when the flux of some part of the membrane increases, the high permeability index will increase, the membrane assembly produces transmembrane differential pressure across the whole body. This pressure difference leads to an uneven distribution of flux in the membrane assembly. Therefore, the energy efficiency of membrane modules will be affected.