Biological densification reactor of multistage AO -IAT

The utility model belongs to the technical field of sewage treatment, a biological densification reactor of multistage AO -IAT is disclosed. Its main technical characteristics does: anaerobism district, first good oxygen district, first anoxic zone, the good oxygen of second district, second anoxic zone, the good oxygen of third district, SBR water distribution district and SBR reaction zone including arranging side by side in proper order pass through to cut off the interval between each adjacent region be provided with the water distribution valve of intaking that feeds through with sewer line in anaerobism district, first anoxic zone and the second anoxic zone be provided with the rabbling mechanism in the anaerobism district be provided with aeration mechanism bottom first good oxygen district, the good oxygen of second district, the good oxygen of third district and the SBR reaction zone first anoxic zone and second anoxic zone have an advancing mechanism be provided with biofilm carrier in the good oxygen of the third district and go out network of rivers check be provided with the sludge pump in the SBR reaction zone and strain water mechanism the sludge pump with be provided with the return sludge pipe between the anaerobism district. The utility model has the advantages of the biological denitrogenation function is strong, and the energy consumption is low, and the operation is reliable, reaches the dephosphorization purpose.