DOUBLE OXIDATION DITCH FOR COMPLETELY BIOLOGICALLY TREATING COMMUNAL AND INDUSTRIAL SEWAGES

摘要

1. A double oxidation ditch for a full biological treatment of domestic sewage and liquid industrial wastes consisting of the segments of the tubes connected with each other with semi-circular segments, preferably with a rectangular intersection, equipped with mechanical airers for aeration characterized in that it is built of tubes laid down concentrically, preferably forming a system whose shape is close to the shape of a square, and the internal tubes constitute the first ditch (2) consisting of three branches (3,4,5), which constitute aeration tanks, which are blocked together with the indirect settling tank (7) located in the fourth branch of the first ditch (2), and the external tubes constitute the second ditch (10) consisting of three secondary branches (12,13,14) of the sewage flow, which constitute the aeration tanks, which are blocked together with the secondary settling tank (15) located in the fourth branch of the second ditch (10), and the indirect settling tank (7) and the secondary settling tank (15) consist of at least two tubes (8,9 and 16,17) working alternately and are located on the opposite sides of the island of the oxidation ditch.IMAGE