Improved A3/O + MBBR domestic sewage treatment device and use method thereof

The invention relates to the technical field of sewage treatment, in particular to an improved A3/O + MBBR (Moving Bed Biofilm Reactor) domestic sewage treatment device and a use method thereof. The treatment device disclosed by the invention comprises MBBRs (Moving Bed Biofilm Reactor) which are arranged in an aerobic zone at intervals, each MBBR comprises a barrel which is internally provided with suspended filler and is provided with holes in the surface, and a flat plate type aerator is communicated with an aeration pipeline and can enable the suspended filler in the barrel to be in a fluidized state; a bearing frame body carrying a catalyst is fixed in the pre-denitration area, metal active components in the catalyst are composed of Pd and Cu, and part of nitrification liquid in the aerobic area is output to the pre-denitration area. The invention solves the problems of low denitrification efficiency, poor filler suspension effect, high energy consumption and the like in the prior art, and has the advant