中文摘要：

以序批式反应器（SBR）为试验系统，采用以乙酸钠、葡萄糖为基质的人工配水为进水，通过固定溶解氧浓度、不断调整进水C／N值和有机负荷，从污泥宏观及微观角度综合研究了C／N值对SBR系统的影响并成功构建了SBR非丝状菌污泥膨胀模型。结果发现：当进水C／N值为52、有机负荷为1．0～1．5kg／（kg·d）、溶解氧为5-7mg／L时即可快速引起非丝状菌污泥膨胀；此外，在构建的非丝状菌污泥膨胀模型中，活性污泥的沉降性能虽然变差、出水浑浊、透明度差，但仍具有高效去除COD和NH4＋-N的能力，对二者的去除率仍能达到90％以上。

英文摘要：

The synthetic wastewater with sodium acetate and glucose as substrate was used as influent of SBR. Through fixing concentration of DO and adjustment of C/N ratio and organic loading, the influence of C/N ratio on SBR was investigated from both macroscopic and microcosmic aspects. A model for non-filamentous sludge bulking in SBR was established. The results show that non-filamentous sludge bulking occurs when the influent C/N ratio is 52, organic loading is 1.0 to 1.5 kg/（ kg · d） , and DO is 5 to 7 mg/L. In the establishment of model for non-filamentous sludge bulking, although the settleability of activated sludge becomes poorer and the effluent is turbid with lower transparency, COD and NH4 - N are still effectively removed, and their removal rates are more than 90%.