Title:
浄化槽汚泥の生物学的窒素除去方法
Document Type and Number:
Japanese Patent JP3591031
Kind Code:
B2
Abstract:
PURPOSE: To provide a method for biological removal of nitrogen from sludge in a water purifier tank wherein an additional amount of an organic material necessary for denitrification can be reduced, and an generated amount of excess sludge can be decreased. CONSTITUTION: Sludge 1 in a water purifier tank and sludge 23 to be treated with ozone, separated in a solid liquid separator 21 are introduced into an ozone treating tank 24, brought into contact with ozone 25 and treated with ozone. The sludge treated with ozone is introduced into a nitrification- denitrifying tank 27, aerated by air in a state of being mixed in return sludge 28, and nitrification and denitrification are simultaneously carried out. The nitrification-denitrified sludge is introduced into a solid liquid separator 21 to separate solid from liquid, and the separated liquid is discharged as treated liquid 11. A part of the separated sludge 22 is returned as return sludge 28 into the nitrification-denitrifying tank 27, and the residue (excess sludge) is returned as the sludge 23 to be treated with ozone into a storage tank 2.
Inventors:
Kensuke Matsui
Hideyoshi Yasui
Hideyoshi Yasui
Application Number:
JP4332195A
Publication Date:
November 17, 2004
Filing Date:
March 02, 1995
Export Citation:
Assignee:
Kurita Water Industries Ltd.
International Classes:
C02F11/00; C02F11/02; C02F11/06; (IPC1-7): C02F11/00; C02F11/02; C02F11/06
Domestic Patent References:
| JP5277475A | ||||
| JP56033096A | ||||
| JP58122094A | ||||
| JP60150898A | ||||
| JP55008835A |
Attorney, Agent or Firm:
Shigeru Yanagihara