WASTE WATER BIOLOGICAL TREATMENT PLANT Russian patent published in 1998 - IPC

FIELD: waste water treatment. SUBSTANCE: plant contains in-series connected admission chamber 1, gratings 2, sand traps 3, primary settlers 4, air tanks 5, and secondary settlers 6. Over the admission chamber 1, mixer 9 is placed in the form of cylinder 10 with tangential connecting pipe 11 connected with pipeline 12 serving to supply sludge from the station 8. Second connecting pipe of mixer (14) is connected with connecting pipe 15 serving to supply crude sludge from primary settlers 4. Mixer 17 is placed over the air tank 5 and has connecting pipe 18 to transfer activated sludge from station 8 and connecting pipe 20 connected with station 8 via pipeline 21 passing through autoclave 22. Mixer 17 would preferably have third connecting pipe 23 connected to air lift 25 serving to feed treated waste water from air tank 5. It would also be desirable to place impellers 26 of shaft drive 27 on the level of tangential connecting pipes of mixers 9 and 17 with propeller blades 28 fixed on the last impeller. EFFECT: improved quality of treatment and increased plant productivity. 4 cl, 5 dwg