A DEVICE FOR FLUSHING AND AERATING A SURFACE COATED WITH MICROORGANISMS IN A PLANT FOR BIOLOGICAL PURIFICATION OF WASTE WATER

摘要

PCT No. PCT/DK80/00037 Sec. 371 Date Feb. 26, 1981 Sec. 102(e) Date Feb. 11, 1981 PCT Filed Jun. 25, 1980 PCT Pub. No. WO81/00101 PCT Pub. Date Jan. 22, 1981.A rotary system composed of two worms (1 and 2) which are built together and interconnected at their central coils by a pipe conduit (4), said worms having their respective coils oppositely directed to one another and consisting of spirally coiled pipes rotatable about a horizontal axis (3), is used for flushing and aerating a medium which is disposed in the pipes and coated with microorganisms. The microorganisms take up nutrients from waste water (6) in a biological purification process, one worm (1) with part of its periphery immersed in the water (6) lifting quantities of water towards its center, the other worm (2) lowering the water to the original level. This provides for alternate flushing and aeration, and the weight of the water in said second worm (2) provides a torque which contributes towards driving the system.