Raw water passes through the grid (to remove suspended solids in water) and then enters the regulating tank (to regulate water quality and quantity), and then enters the anoxic tank (generally pumped up). In the anoxic tank, raw water and returned sludge are mixed for denitrification to remove nitrogen and phosphorus in the water (usually there is a submersible agitator in the anoxic tank), and the reacted mixed liquid flows into the MBR reaction tank, where an aeration head is installed for aeration to remove pollutants such as carbon and ammonia nitrogen in the water. Effluent from MBR reaction tank enters disinfection tank, and chlorine dioxide is added into disinfection tank through chlorine dioxide generator to disinfect effluent, and then discharged.
Because the activated sludge in MBR reactor will continue to proliferate, part of it will return to anoxic tank for denitrification, nitrogen and phosphorus removal; Another part of the excess activated sludge is discharged into the sludge pond in the form of excess sludge, and the activated sludge will be further separated from the sludge in the sludge pond. When the sludge tank is full, the supernatant will flow back to the regulating tank through the overflow pipe. After a period of time, the sludge at the bottom will be manually removed and then transported out.