中文摘要：

以城市污水为处理对象,开展多点进水-多级A/O工艺高效脱氮技术研究,并深入考察研究了系统中颤蚓的生长特性及其对系统脱氮能力和污泥特性的影响.经过120 d的强化运行,系统表现出良好的处理效果,COD平均去除率为84%,氨氮去除率接近100%,TN去除率稳定在70%～80%,这3个指标可满足城镇污水处理厂污染物排放标准（GB18918—2002）一级A标准的要求.经长期考察发现,低DO质量浓度不利于颤蚓生长,成蚓对兼性空间的需求较幼蚓高.颤蚓的生长未对系统处理效果产生影响,还促进了系统污泥的沉降性,并有一定的污泥减量效果.

英文摘要：

Taking municipal waste water as treatment object, a step feeding-multistage A/O process for nitrogen removal was conducted. Furthermore, the aim of this paper was to research growth characteristic of Tubificidae, and its affection to nitrogen removal and sludge charactenstics. After 120 days operation, a good performance was achieved in the system. The COD ,NH~-N and TN removal efficiency was 84% 100% and 70% -80%, respectively. Three above indexes could meet Standard A of Level 1 in ＂Discharge Standard of Pollutants for Municipal Wastewater＂ （GB18918--2002）. It was found that low DO concentration was unfit for tubificidae growth, and the mature Tubificidae required more faeuhative space than the larvaes in the long-time operating process. Tubificidae growth didn＇ t affect the removal ability of the system. And, it could increase the sludge sedimentation performance and promoted sludge reduction in a certain degree.