中文摘要：

采用序批式活性污泥（sequencing batch reactor，SBR）工艺处理低碳氮比实际生活污水，研究了低溶解氧丝状菌污泥膨胀的成因及不同运行模式对低溶解氧污泥膨胀控制效果．试验结果表明，缺氧／好氧（anoxic／oxic，A／O）工艺当溶解氧（dissolved oxygen，DO）的质量浓度P（DO）控制在0．5mg／L时，发生以H．hydrossis为优势菌的丝状菌污泥膨胀．当采用SBR工艺A／O运行模式，改变有机负荷（F／M）为0．83ks／（kg·d），P（DO）控制在2．0mg／L左右时，污泥膨胀并不能有效控制，污泥体积指数（sludgevolumeindex，SVI）一直保持在300mL／g以上．经荧光原位杂交（fluorescence in situ hybridization，FISH）方法鉴定，优势菌种依然为H．hydrossis丝状菌，在此阶段系统总氮（totalnitrogen，TN）平均去除率为31．17％，COD平均去除率为65．04％．当采用全程好氧运行模式，改变F／M为0．37kg／（kg·d），P（DO）控制在2．0mg／L左右时，能有效控制污泥膨胀，SVI下降到150mL／g以下．在此阶段，NH4＋-N去除率接近100％，出水P（NH4＋-N）几乎为0，TN和COD的平均去除率分别上升为70．7％和73．9％．此阶段出水P（TN）和P（COD）平均值分别为18．4和46．9mg／L，接近国家一级A排放标准．

英文摘要：

By treating real domestic sewage which is low p （C）/p （N） in sequencing batch reactor （SBR） , the cause of filamentous sludge bulking and the effect of controlling filamentous sludge bulking under low dissolved oxygen with different operation patterns were investigated. Results showed that when the dissolved oxygen （DO） value was 0.5 mg/L in anoxic/oxic process （A/O）, filamentous sludge bulking happened and H. hydrossis was the dominant filamentous bacteria in filamentous bulking sludge. During A/ O pattern in SBR, sludge volume index （SVI） has maintained beyond 300 mL/g when organic loading （F/M） was 0. 83 kg/（kg-d） and the p（DO） was about 2 mg/L, the sludge bulking could not be effectively controlled. The result of fluorescence in situ hybridization （FISH） manifested that the main filamentous bacteria was also H. hydrossis filamentous bacteria. In this period, average removal rates of total nitrogen （TN） and COD were 31. 17% and 65.04% , respectively. Then during aerobic pattern, when F/M was0.37 kg/（kg d） , thep（DO） was also about 2 mg/L, the sludge bulking has been controlled effectively and SVI has remained below 150 mL/g. In this stage, the removal rate of NH4＋ -N reached 100% nearly , the p（NH4＋ -N）in effluent was almost 0. Average removal rates of TN and COD improved to 70.7% and 73.9% , respectively. The average p（TN） and p（COD） in effluent were 18.4 and 46.9 mg/L, respectively, close to the national level A emission standard.