A type of baffled biological aerated filter (BBAF) equipment was developed to treat small town sewage of Three Gorges Reservoir region. The good mechanical and hydraulic properties of the filter were achieved by integrating multi-stage series modular BAF in a concentric circle reactor. Under the operation with the design parameters, the average removal of the process of SS, COD, NH3-N,TN and TP were 76% , 83% , 97% , 26% and 45%, respectively. Higher gas-water ratio would improve COD and NH3-N removal while reduce TN and SS removal, and the proper gas-water ratio for the BBAF was 9. The removal of SS, COD, and NH3-N kept the same with the variation of treatment loading between 1. 5 m3/h and 3. 0 m3/h. The stable effluent water quality showed the anti-shock loading capability and strong applicability of the BBAF possesses to the small town sewage with large coefficient variation.%针对三峡库区小城镇生活污水处理特点,研发折流式曝气生物滤池(BBAF)设备,通过将多级串联组合式BAF集成在同心圆式反应器内,形成了良好的力学性能和水力条件.在设计参数下运行时,对SS、COD、NH3-N、TN和TP的平均去除率分别为76％、83％、97％、26％和45％.高气水比有利于COD和NH3-N的去除,但会削弱TN、SS的去除效能,BBAF适宜的气水比为9.当处理负荷在1.5～3.0 m3/h范围内变化时,SS、COD和NH3-N的平均去除率无明显波动,出水水质稳定,表明设备具有较强的抗冲击负荷能力,对小城镇污水量变化系数大的特点具有很好的适用性.
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