Title:
REMOVING METHOD OF NITROGEN IN WASTE WATER
Document Type and Number:
Japanese Patent JP3958900
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently and stably remove nitrogen from waste water having >100 mg/l ammonia nitrogen concentration using autotrophic bacteria.
SOLUTION: At the time of biologically denitrification from the waste water, nitrous nitrogen and nitrate nitrogen in the waste water are reduced into gaseous nitrogen to remove nitrogen from the waste water by using heterotrophic bacteria and sulfur oxidation bacteria in combination as the denitrification bacteria in an oxygen-free tank 2, an aerobic tank 3 for oxidizing ammonia to nitrous nitrogen and nitrate nitrogen with nitrification bacteria is provided in the poststage of the oxygen-free tank 2 and the treated water is circulated to the oxygen-free tank 2. It is preferable that the oxygen-free tank is provided in multistage to use the heterotrophic bacteria and the sulfur oxidation bacteria to segregate, the aerobic tank 3 is provided in multistage to use the nitrous bacteria and the nitrate bacteria of the nitrification bacteria to segregate and the water treated with the nitrous bacteria is circulated to the oxygen-free tank, where the sulfur oxidation bacteria is mainly existed, and the water treated with the nitrate bacteria is circulated to the oxygen-free tank, where the heterotrophic bacterial is mainly existed.
More Like This:
| WO/2002/013954 | IMMERSION TYPE MEMBRANE FILTER |
| JP3873842 | WATER TREATMENT METHOD AND EQUIPMENT THEREFOR |
| JP2022021204 | MODIFICATION METHOD FOR ACTIVATED SLUDGE TREATMENT FACILITIES |
Inventors:
Miki
Toshiro Kato
Toshiro Kato
Application Number:
JP25968499A
Publication Date:
August 15, 2007
Filing Date:
September 14, 1999
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C02F1/44; C02F3/34; C02F3/28; (IPC1-7): C02F3/34; C02F1/44; C02F3/28
Domestic Patent References:
| JP4074598A | ||||
| JP4151000A | ||||
| JP5234322A | ||||
| JP5115897A | ||||
| JP60034797A | ||||
| JP7008994A | ||||
| JP8052492A | ||||
| JP8117789A | ||||
| JP6182393A | ||||
| JP9029282A | ||||
| JP5146799A | ||||
| JP5115864A | ||||
| JP5228493A | ||||
| JP8168796A | ||||
| JP62286598A | ||||
| JP5146795A |
Attorney, Agent or Firm:
Katsuo Naruse
Tomohiro Nakamura
Masashi Torino
Kazuya Sasaki
Masamitsu Akizawa
Tomohiro Nakamura
Masashi Torino
Kazuya Sasaki
Masamitsu Akizawa
Previous Patent: SEMICONDUCTOR STORAGE DEVICE AND MANUFACTURE THEREOF
Next Patent: IRON OXIDE PARTICLE AND ITS PRODUCTION
Next Patent: IRON OXIDE PARTICLE AND ITS PRODUCTION