The aim of the study is to reveal local mass transfer conditions along a tubular membrane module integrated in conventional stirred sMBR. The vessel comprises dual radial flow impeller and bottom gas distributor. CFD methodology is employed in simulation of a model bio-system explored previously. The solute concentration profiles near membrane surface are determined at impeller speed 400−750 rpm, gas flow rate 1–2 vvm and power law parameters 0.02<K<0.55 Pa.sⁿ, 0.34<n<0.78. Boundary layer thickness δ_c and retention-side mass transfer coefficient k_m are determined; δ_c is most often in the range δ_c∼1·10⁻³–2·10⁻³ (i.e. 80−160 μm) at membrane sections facing the impellers and between 2·10⁻³ and 8·10⁻³ (i.e. 160−640 μm) in sections between the impellers and throughout membrane shadow. The membrane area-averaged mass transfer coefficient is found to be in the range k_m∼3.3·10⁻⁵–5.6·10⁻⁵ m/s depending on mixing intensity. Significant cross-membrane spatial variation of k_m between 1·10⁻⁵ and 1.2·10⁻⁴ m/s is discovered. The membrane performance efficiency is discussed in terms of impeller selection. Improvement of sMBR performance is foreseen in using impeller design of mixed radial-axial flow circulation.

该研究的目的是揭示沿传统搅拌sMBR中集成的管状膜组件的局部传质条件。该容器包括双径流叶轮和底部气体分配器。CFD方法论被用于模拟先前探索的模型生物系统。在叶轮转速400-750 rpm，气体流速1-2 vvm和功率定律参数0.02 < K <0.55 Pa.s ⁿ，0.34 < n <0.78的情况下，确定膜表面附近的溶质浓度分布。边界层厚度δ _Ç和保留侧传质系数ķ_米被确定; δ _Ç是最经常在范围δ _Ç〜1·10在面向叶轮的膜部分处为⁻³ –2·10 ^-3（即80−160μm），在叶轮之间的部分以及整个膜阴影中为2·10 ^-3和8·10 ^-3（即160−640μm）之间。膜面积平均传质系数被发现在范围ķ_米~3.3·10 ^-5 -5.6·10 ^-5米/秒取决于混合强度。k _m在1·10 ^-5和1.2·10 ^-4之间的显着跨膜空间变化m / s被发现。膜的性能效率将根据叶轮的选择进行讨论。通过使用混合径向-轴向流循环的叶轮设计，可以预见到sMBR性能的提高。