中文摘要：

向好氧段投加生物填料，形成悬浮活性污泥和附着生物膜共存的复合式A／O工艺系统，并在低温环境下进行了中试系统的启动及稳定运行研究。结果表明，经过35d的启动，系统内的MLSS可保持在6000mg／L以上，对COD和NH4＋-N的去除率分别可达到85％和80％以上；稳定运行后，系统对污水中COD、NH4＋-N、TN、TP、ss的平均去除率分别可达到84．81％、81．65％、47．77％、84．17％、95．57％，出水平均浓度分别为26．71、5．43、18．95、0．9、14．61mg／L，出水水质可达到《城镇污水处理厂污染物排放标准》（GB18918--2002）的一级B标准。

英文摘要：

Biological media were added into aerobic zone to create a hybrid A/O process in which suspended activated sludge and attached biofilm coexisted. The start-up and operation of the pilot test system were conducted in low temperature condition. The results showed that after 35 d of start-up, MLSS could be maintained at more than 6 000 mg/L, and the removal rates of COD and NH4＋ - N were more than 85% and 80%, respectively. After stable operation was achieved, the average removal rates of COD, NH4＋ -N, TN, TP and SS were 84.81% , 81.65% , 47.77% , 84.17% and 95.57%, respec- tively, and the corresponding average concentrations in the effluent were 26.71 mg/L, 5.43 mg/L, 18.95 rag/L, 0.9 mg/L and 14.61 mg/L, respectively. The effluent quality met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002）.