Method for promoting granulation of aerobic sludge by combining coagulating sedimentation and double-zone sedimentation tank

The invention discloses a method for promoting aerobic sludge granulation by combining coagulative precipitation and a double-zone sedimentation tank, and relates to the technical field of wastewater treatment, and the method comprises the following steps: sewage sequentially enters a coagulative precipitation tank and a biochemical tank; effluent of the biochemical pool enters a double-zone sedimentation tank; heavy sludge in the double-zone sedimentation tank is sent back to the biochemical tank; light sludge in the double-area sedimentation tank is directly discharged; effluent in the double-area sedimentation tank is discharged after reaching the standard; the method aims at the characteristics and defects of the sedimentation process of the coagulating basin and combines the advantages of the double-area sedimentation basin, so that the mud-water separation efficiency is improved, and the biological nitrogen and phosphorus removal is enhanced by utilizing the synchronous nitrification and denitrification