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浸没式膜生物反应器系统内膜面附近的气液两相流动力学特性对控制浓差极化和膜污染具有重要影响。应用粒子图像测速(PIV)技术对浸没式膜生物反应器内近膜面的液相流场动力学特性进行了研究。采用相分离技术灰度分辨法将通过PIV技术得到的气液两相流场图像中的液相速度场进行辨别,得到膜面附近的液相流场数据,并应用Tecplot软件计算得出液相流的涡量特性。在3 mm曝气孔径,2.5、3.0、3.5、4.5、5.5和6.5 m3/h 6种曝气强度下分析了膜面附近的液相速度场和涡量场。结果表明,曝气强度对液相流场和涡量场的影响较大,在一定范围内增加曝气强度可以使得液相速度和涡量增加,同时,分析了3 mm孔径下圆帽状气泡的动力学特性。研究结果为膜生物反应器系统的优化设计提供了研究经验和实验数据。
The dynamics of gas-liquid two-phase flow in the vicinity of the intima of the submerged membrane bioreactor system plays an important role in controlling the concentration polarization and membrane fouling. The particle velocity field (PIV) technique was used to study the dynamic characteristics of the liquid phase near the membrane surface in a submerged membrane bioreactor. The phase velocity field in gas-liquid two-phase flow field obtained by PIV technique was discriminated by the gray-scale method of phase separation technique to obtain the liquid-phase flow field data near the membrane surface. The liquid phase was calculated by Tecplot software Vorticity characteristics of flow. The velocity field and vorticity field near the membrane surface were analyzed under 3 aeration apertures, 2.5, 3.0, 3.5, 4.5, 5.5 and 6.5 m3 / h aeration intensities. The results show that the aeration intensity has a great influence on the liquid flow field and the vorticity field. Increasing the aeration intensity within a certain range can increase the liquid velocity and vorticity. At the same time, Kinetic characteristics. The research results provide research experience and experimental data for the optimal design of membrane bioreactor system.