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Sludge reflux
Function of each unit: 1. Regulating pool: regulating the water quality and quantity to ensure that the water quality remains relatively stable before the sewage enters anaerobic, and some pollutants can be removed;
2. Anaerobic: mainly degrade macromolecular pollutants into small molecular pollutants, and degrade refractory pollutants into easily degradable substances, paving the way for the treatment of aerobic system;
3. Aerobic system: most pollutants are removed, and most pollutants are converted into water and carbon dioxide by adsorption of sludge particles and decomposition of microorganisms.
4. Sedimentation tank: the mud-water mixture from the aerobic system is separated, and the settled sludge flows back to the front end of the aerobic treatment system, and the effluent enters the urban pipe network through the overflow weir plate.