Title:
排水からの窒素の除去方法
Document Type and Number:
Japanese Patent JP4031597
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To efficiently and stably remove nitrogen from waste water with an ammonia nitrogen concn. of above 100 mg/l by using autotrophic bacteria. SOLUTION: When nitrite nitrogen and nitrate nitrogen in waste water are reduced to nitrogen gas by using autotrophic bacteria to be removed from waste water, the floating outflow of autrotrophic bacteria from a denitrification tank 2 is prevented by using a membrane separator 4 or a filter to increast the concn. of autrotrophic bacteria in the denitrification tank 2. As autrotrophic bacteria, granulated sulfur oxidizing bacteria or sulfur oxidizing bacteria having self-granaulation action are pref. used. The membrane separator 4 to be used pref. uses a membrane with a pore size of 500 μm or less and the filter to be used pref. is packed with a filter medium with a particle size of 3 mm or less.
Inventors:
Miki
Toshiro Kato
Toshiro Kato
Application Number:
JP25307499A
Publication Date:
January 09, 2008
Filing Date:
September 07, 1999
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C02F1/44; C02F3/34; B01D24/00
Domestic Patent References:
| JP6182393A | ||||
| JP63229197A | ||||
| JP7214090A | ||||
| JP10277590A | ||||
| JP9029282A | ||||
| JP10314792A |
Attorney, Agent or Firm:
Katsuo Naruse
Tomohiro Nakamura
Masashi Torino
Kazuya Sasaki
Masamitsu Akizawa
Tomohiro Nakamura
Masashi Torino
Kazuya Sasaki
Masamitsu Akizawa