本文以气升循环分体式MBR为研究对象，采用计算流体力学数值模拟方法，展开H循环管水力学条件优化研究。对H循环管的作用及H循环管管径大小的影响进行了模拟分析，并推导出H循环管循环流速U的计算公式。结果表明，H循环管对于气升循环分体式MBR具有必要性；膜单元与生物单元之间的循环流量随H循环管管径增大而增大，而当D/L（H循环管管径/膜池回流口长度）=22.2%时，H循环管平均循环流速最大，循环效率较高；推导得出H循环管内流速计算公式为：U=1/n R^(2/3) [(H_0/l)(Q_a1/(v_1 A_1 )-Q_a2/(v_2 A_2 )) ]^(1/2)。本文研究结果可为MBR水力学研究与气升循环分体式MBR研究与应用提供科学依据和参考。

In this study, computational fluid dynamics (CFD) was implemented to study the hydrodynamic characteristics of H circulating pipe in airlift external circulation membrane bioreactor (AEC-MBR). The role of H circulating pipe and the effect of different diameters of H circulating pipe on circulation were modeled and analyzed. Furthermore, formula of circulation flow velocity in H circulating pipe was deduced. The results showed that H circulating pipe was necessary and played an important role in the AEC-MBR, and that an increase in the diameter of H circulating pipe led to an increase in the mass flow rate between the membrane unit and the aeration tank. The mean flow velocity in H circulating pipe reached a maximum when D/L=22.2%. An equation was derived for determining the velocity of the circulation flow in the H circulating pipe as U=1/n R^(2/3) [(H_0/l)(Q_a1/(v_1 A_1 )-Q_a2/(v_2 A_2 )) ]^(1/2).The results and research method provide by this paper can be used as a reference for further hydraulic study of MBR.   

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