The invention relates to the technical field of integrated
sewage treatment devices, in particular to an integrated
sewage treatment device based on an A3O + MBBR process, which is characterized in that an aerobic cavity and a
precipitation cavity are respectively arranged at the upper part and the lower part of the middle part of a cylindrical box body, an anoxic cavity, an anaerobic cavity and a pre-denitration cavity are sequentially arranged outside the aerobic cavity, and a clear water cavity is arranged outside the
precipitation cavity; a stirring rod rotationally sleeved at the center of a top cover is fixedly sleeved with the center of a disc, the bottom of a stirring shaft fixedly sleeved on the disc respectively corresponds to each cavity, a valve is arranged at the top end of a cylindrical shell fixedly sleeved at the center of the bottom surface of the aerobic cavity, a spiral conveyor is used for discharging
sludge from the bottom of the
precipitation cavity, and a spherical filler is filled in the aerobic cavity. The proportion of
sewage injected into the pre-denitration cavity, the anaerobic cavity, the anoxic cavity and the aerobic cavity through a stirring shaft or a sewage straight
pipe is 5: 2: 2: 1, a mechanism for returning
sludge to the pre-denitration cavity and the anaerobic cavity is arranged in the precipitation cavity, and a mechanism for returning
nitrification liquid to the anoxic cavity is arranged in the aerobic cavity; the
sewage treatment efficiency is improved, and the occupied area is small.