FIELD: treatment of sewage under anaerobic and aerobic conditions, bio-chemical cleaning of sewage from organic, nitrogen-containing and phosphorus-containing agents; extensive final treatment of domestic waste water. SUBSTANCE: proposed plant includes water pressure damping chamber located in water flow equalizer which is made in form of anaerobic reactor connected with denitrifier by means of adjustable first bypass through first partition. Denitrifier is connected with first-stage aerotank through adjustable straight second bypass in second partition; this aerotank is connected with second-stage aerotank through straight third bypass in third partition. Aerotank is made in form of nitrifier with charge which is connected with settler by means of straight fourth bypass in fourth partition; settler is connected in its turn with filter through fifth straight bypass in fifth partition; filter is connected with decontaminator. First-stage aerotank and nitrifier are equipped with aeration system; water flow equalizer, denitrifier and settler are equipped with hydraulic mixing and recirculating systems. EFFECT: high degree of cleaning sewage from nitrogen-containing and phosphorus-containing agents. 10 cl, 1 dwg
