中文摘要：

采用UCT型浸没式膜生物反应器处理合成市政污水,考查了ρ（COD）/ρ（TN）对该工艺在营养物去除效能及膜污染方面的影响.结果表明：UCT-MBR工艺抗冲击负荷能力强,ρ（COD）/ρ（TN）对COD去除效能几乎无影响,平均去除率保持在89.9％;在ρ（COD）/ρ（TN）为7.3时,TN和TP的去除率达到最高,分别为90.27％和92.4％.同时发现,ρ（COD） /ρ（TN）由3.2增加到7.3时通过同步硝化反硝化的脱氮率、缺氧除磷率分别由1.6％、7.94％提高到27.9％、44.91％.ρ（COD）/ρ（TN）的增加改变了脱氮途径,加速了膜污染速率.有机容积负荷的增加和溶解氧的降低是引起膜池通过同步硝化反硝化脱氮的主要原因,同时也影响着污泥的理化性质与代谢产物.由于胞外聚合物比污泥质量浓度和溶解性微生物产物的质量浓度在同步硝化反硝化的条件下增加,导致了污泥成分中颗粒与溶解性成分修正污染指数值均有所增加,从而使得污泥的可滤性恶化.在相同气水剪切力的背景下污泥粒径尺寸由于溶解氧的降低而略有下降.此外对附着在膜表面的生物膜的反硝化脱氮量与膜污染速率的相关性也进行了评估.

英文摘要：

A bench-scale UCT-type submerged membrane bioreactor was utilized to treat synthetic municipal wastewater with foucus on the influences of ρ （ COD）/ρ （TN） on biological nutrients removal and membrane fouling. Results show that the process has a strong capability of anti-shock organic loading and average 89.9% of organic matter is removed, indicating chemical oxygen demand （COD） removal is irrespective of ρ （COD）/ρ （TN） ratio. The average removal effieiencies of total nitrogen （TN） and total phosphorus （TP） under p （ COD）/ρ （TN） ratio of 7.3 are the highest at 90.27% and 92.4% respectively. Futhermore, proportions of TN removal via aerobic simultaneous nitrification and denitrification （SND） and total phosphorus removal via anoxic phosphorus removal increase to 27.9% , 44.91% from 1.6%, 7.94% （ρ （COD）/ρ （TN） ratio of 3.2 to 7.3 ） respectively. Higher fouling rate is observed with the increasing p （COD）/ρ （TN） ratio which changes the nitrogen removal pathway. The increase of organic loading and decrease of dissolved oxygen induce the aerobic SND behavior that affect the phychemical properties and metabolic productions of aerobic biosolids. The sludge filterabilitydeteriorate due to higher extracellular polymeric substances （EPS） concentration normalized against mixed liquor suspended solid （MLSS） and soluble microbial products （SMP） concentration under SND condition, which also result in higher modified fouling index （MFI） values both for suspendeded solids and soluble components. Bio-floc sizes decrease slightly under the backgroud of the high air shear stresses owing to the decreased dissolved oxygen. Correlation between the fouling rate and the nitrogen reduction across the membrane via dinitrification of biofilm attached on the membrane surface is also assessed.