公开(公告)号：DE2400416A1

公开(公告)日：1975-07-24

申请号：DE2400416

申请日：1974-01-05

Applicant: BASF AG

Inventor： HESS KLAUS DR ,  STICKEL RICHARD DIPL ING ,  NAGEL OTTO DR ,  SINN RICHARD PROF DR ING DR ,  DAUCHER HANS DIPL ING DR

IPC: C02F3/22 ,  B01F3/04 ,  B01F3/08 ,  B01F5/02 ,  C02F3/12 ,  C02C1/06

Abstract: Waste water and sewage, contg. biodegradable impurities, are treated in >=1 enclosures with dissolved oxygen and activated sludge. The contact between these three reacting materials is intensified by increasing the number of interfaces and by shortening the diffusion paths in the sludge floccules. Injectors are used to this effect with a liq. nozzle an annular, concentric nozzle for the gas and an impulse exchange tube. The jet of liq. leaves the nozzle at a speed of 29m/sec. and sets up a shear gradient in the activated sludge; the air bubbles are finely divided and at the same time the sludge is sucked into the zone of the jet and is intensely mixed in the tube. The sludge leaving the latter is satd. with oxygen and the gas it contains causes it to rise in the form of a bubbling column to the surface of the activated sludge, giving up its oxygen proportionally to the depth of immersion of the injector and the oxygen content of the gas. The quantity of sludge which can be treated per unit of vol. of a biological settlement plant per day can be increased by 100% as compared with known processes.