Tricking filtration type sewage treatment device

The trickling filtration type sewage treatment device comprises a biological trickling filtration tower, a biological fluidized bed and a sedimentation tank, the biological trickling filtration tower comprises a water distributor and filler, sewage sequentially flows through the water distributor and the filler and then enters the biological fluidized bed, and part of supernate discharged by the biological fluidized bed passes through the water distributor and the filler and then enters the sedimentation tank. According to the scheme, denitrifying bacteria are separated from carbonization and nitrifying bacteria, a good and specific denitrification environment is created, denitrification is better carried out, the tail end of the biological fluidized bed reflows clear water through the structure, the problem of blockage of the biological trickling filter is solved, and the tail end of the biological fluidized bed can be recycled. The problem that the hydraulic load of the whole system is too high due to backf