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针对研究开发的四边形折流式膜生物流化床,构建了气、固、液三相流可视化平台,应用取样法和激光粒子图像测速(PIV)技术剖析了不同进水流量和曝气强度组合对流化床内的填料浓度及液相流场特性的影响.结果表明,折流板上部形成的曝气死区,提高了升流区的填料浓度;折流板和导流锥形成的进水角度使流场冲击反应器底部的填料,提高了在低曝气强度下流化床的填料浓度,在实际运行过程可降低曝气能耗;四边形折流式膜生物流化床的结构特点导致填料与膜组件相互碰撞的概率增大,强化了膜污染的控制.曝气强度和进水流量的变化改变了液相的轴向返混强度和剪切力,进而改变了填料浓度,使气、固、液三相冲刷膜组件的作用增大,最终影响膜面传质系数和浓差极化边界层厚度,降低了膜污染.通过流化床结构的改变提高填料浓度和改善流场特性,为高浓度有机废水好氧生物的处理提供了一个研究方向.
According to the research and development of quadrilateral baffled membrane biofluidized bed, a three-phase visualization platform of gas, solid and liquid flow was constructed. Sampling methods and laser particle image velocimetry (PIV) were used to analyze the effects of different influent flow rates and aeration intensity combinations On the concentration of the filler in the fluidized bed and the flow field characteristics of the liquid phase.The results show that the aeration dead zone formed on the upper part of the baffle increases the packing concentration of the upflow zone, Water angle makes the flow field impact the packing at the bottom of the reactor to increase the packing density of the fluidized bed under the low aeration intensity and reduce the energy consumption of aeration during the actual operation. The structural characteristics of the quadrangular baffled membrane biofluidized bed Leading to the collision between the filler and the membrane module increases the probability of strengthening the control of membrane pollution aeration intensity and influent flow changes in the liquid phase axial back mixing strength and shear force and thus change the filler concentration Gas, solid and liquid three-phase erosion of the membrane component increases, and ultimately affect the membrane surface mass transfer coefficient and concentration polarization boundary layer thickness, reducing the membrane pollution by changing the fluidized bed structure to increase the concentration of filler and improve the flow field Features, high concentrations of organic Wastewater treatment of aerobic organisms provides a research direction.