FIELD: biochemical purification of sewage. SUBSTANCE: invention presents the installation for biochemical purification of economic - household and industrial sewage with content of the organic impurities according to Regulations on Biochemical Oxygen Demand (-== ) is from 100 up to 10000 mg / l and the suspended substances - up to 5000 mg/l. Installation has a combined device, that includes a mixing chamber of sewage with a silt mixture liquor, a biofilter with a sprinkling system, located above an aerotank-settler having aeration columns for maintenance of stream type aeration and a circulating pump. The aeration columns are made in the form of divergent bundles of pipes, inside the upper part of which there are straightening projections in the form of spirals, and the lower parts of the pipes are perforated and the diameter of the apertures increases top-down and distances by circumference and by height are decreasing in direction to the lower part of the pipes. The lower ends of the pipes are uniformly placed above the flat part of the aeration tank bottom at the height of 0.2 0.3 m over it. EFFECT: the invention allows to increase efficiency and stability of operation of the combined device in the biochemical purification of sewage. 3 cl, 8 dwg
