State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China.
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China.
Bioresour Technol. 2018 Dec;269:355-362. doi: 10.1016/j.biortech.2018.08.111. Epub 2018 Aug 29.
In this study the effect of different fouling stages of hollow fiber membranes on effective backwashing length in MBR has been investigated. Computational fluid dynamics (CFD) is imported to simulate backwashing process. A multi-physics coupling model for free porous media flow, convective mass transfer and diluted species transport was established. The laser bijection sensors (LBS) were imported to monitor the backwashing solution position inside fiber lumen. Simulation results indicated that membrane fouling degree could change the velocity of backwash solution inside fiber lumen and make a further effect on effective backwash length. The signal variations of LBS are in accordance with the simulation results. The backwashing process can only play an active role when the filtration pressure is below the critical TMP. It can be concluded that backwash duration in industrial applications need to be set based on changes in TMP.
本研究考察了不同污染阶段对膜生物反应器中有效反冲洗长度的影响。采用计算流体动力学（CFD）模拟反冲洗过程。建立了自由多孔介质流动、对流质量传递和稀物种输运的多物理耦合模型。激光注入传感器（LBS）用于监测纤维内腔中反冲洗溶液的位置。模拟结果表明，膜污染程度会改变纤维内腔中反冲洗溶液的速度，并对有效反冲洗长度产生进一步的影响。LBS 的信号变化与模拟结果一致。反冲洗过程只有在过滤压力低于临界 TMP 时才能发挥积极作用。可以得出结论，工业应用中的反冲洗持续时间需要根据 TMP 的变化来设置。
