FIELD: cleaning of domestic and agricultural sewage waters. SUBSTANCE: method involves physical-chemical and biological cleaning of water by coagulation, settling, flotation, filtration and aeration. Aeration is conducted by blowing off ammonia or by streaming in two stages. At the first stage silt and water mixture is urged to be continuously circulated to provide maximum surface area of contact between water to be cleaned and air flow. At the second stage nozzle is introduced into water flow to facilitate nitrification of ammonia nitrogen on nozzle surface under the action of aerobic bacteria. Upon completion of aeration, nozzle is introduced into cleanable water flow and additional amount of water is poured in anaerobic conditions, with additional water being cleaned from organic contaminants only partially to provide nutrient medium for anaerobic bacteria, which facilitate denitrification of water after aerobic cleaning of water. Device has a succession of interconnected aerating reactors, which are positioned downstream of ammonia blow-off column. Each reactor has nozzle and circulation system. Terminating reactor has pipeline for supplying partially cleaned water from ammonia blow-off column to reactor. EFFECT: increased efficiency in cleaning sewage waters. 4 cl, 3 dwg, 2 tbl
