Segmented water inlet three-stage AO mud film composite reactor

The utility model provides a sectional water inlet three-stage AO (Anaerobic Oxic) mud film composite reactor, which relates to the technical field of sewage treatment and comprises a reactor main body, a plurality of perforated baffles and a filler, the reactor main body comprises a plurality of stages of AO tanks and a secondary sedimentation tank; the porous baffles divide the multi-stage AO tank into seven units, namely a first anaerobic unit, a second anaerobic unit, a first aerobic unit, a third anaerobic unit, a second aerobic unit, a fourth anaerobic unit and a third aerobic unit in sequence according to the water inlet direction; and the filler is arranged in the aerobic unit. According to the utility model, the activated sludge and the polyurethane filler are uniformly mixed to fully and synergistically nitrify and denitrify nitrate nitrogen in the sewage, so that the problems of high economic cost, low denitrification efficiency and the like caused by the fact that an extra carbon source needs to b