平板膜生物反应器中临界通量问题研究

Research of critical flux in the flat sheet MBR operation

通过小试试验,探讨了平板膜生物反应器中临界通量问题。在试验中发现,平板膜生物反应器运行过程中,存在临界通量值,本试验中污泥质量浓度为10 g/L,临界通量值为4.86×10-6m/s;在该通量值以下运行时,膜污染速度比较缓慢,在该通量值以上运行时,膜污染比较迅速。通过对膜运行过程阻力的分析发现,随着通量的提高,内部污染阻力增加速度大于膜泥饼污染阻力增加速度。膜片在恒流下运行一段时间后,压力会突然上升,其主要原因是由于膜面泥饼的聚集。

This paper investigated the critical flux of flat sheet MBR. Results from experimental analysis revealed that： （1） Critical flux can be get in the operation of flat sheet MBR. Critical flux value is 4, 86 × 10^-6 m/s, while MLSS= 10 g/L, （2）Operated below the critical flux, membrane fouling enhanced slowly, Operated up the critical flux, membrane fouling enhanced rapidly, （3） With the increase of the flux of membrane, the inside resistance of membrane enhanced more quickly than the clay resistance of the membrane, （4）The operation pressure increase rapidly after the membrane operated on constant flux.