Le-Clech P, Alvarez-Vazquez H, Jefferson B, Judd S
IEWRM, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 UTM Skudai Campus, Malaysia.
Water Sci Technol. 2003;48(3):113-9.
As with all membrane processes, turbulence, as promoted by aeration in submerged membrane bioreactors (MBRs) or pumping in sidestream (SS) systems to produce somewhat higher effective cross-flow velocities, increases mass transfer and reduces fouling. This is manifested in an elevated critical flux, the flux at which the membrane permeability is sustained. However, the non-Newtonian nature of the sludge makes precise rheological characterisation difficult. In this study, a calculation of the appropriate hydrodynamics parameters for a SS MBR configuration is presented. Optimisation of the aeration in a submerged MBR system has been attained by defining the minimum air velocity required for Taylor bubble formation.
与所有膜过程一样，在浸没式膜生物反应器（MBR）中通过曝气或在侧流（SS）系统中泵送以产生稍高的有效错流速度所促进的湍流，会增加传质并减少污垢。这表现为临界通量升高，即膜渗透率得以维持的通量。然而，污泥的非牛顿性质使得精确的流变学表征变得困难。在本研究中，给出了SS MBR配置的适当流体动力学参数的计算。通过定义形成泰勒气泡所需的最小空气流速，实现了浸没式MBR系统曝气的优化。
