Title:
BIOLOGICAL NITROGEN REMOVING DEVICE
Document Type and Number:
Japanese Patent JP3252888
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a biological nitrogen removing device capable of realizing large reduction in the size of a device to remove nitrogen from waste water containing ammonia nitrogen.
SOLUTION: A liquid containing ammonia nitrogen introduced into a flowing part is brought into contact with an aerobic atmosphere in a nitrification tank 10 containing a carrier on which AH bacteria are preferentially grown. In the tank 10, the liquid is subjected to nitrification which produces a higher proportion of nitrous acid as an intermediate oxide than the proportion of nitric acid as a terminal oxide. Further, the nitrified liquid having a higher proportion of nitrous acid is made to react in a denitrification tank 12 containing denitrification bacteria. Since such kinds of bacteria that denitrify nitrous acid are preferentially grown, nitrous acid is reduced into nitrogen gas and removed. Therefore, the reaction amt. and the treatment time can be decreased compared to a process to denitrify from nitric acid.
Inventors:
Tatsuo Sumino
Yuki Nakamura
Kazuhiko Noto
Masataka Kasai
Yuki Nakamura
Kazuhiko Noto
Masataka Kasai
Application Number:
JP23286295A
Publication Date:
February 04, 2002
Filing Date:
September 11, 1995
Export Citation:
Assignee:
Hitachi Plant Construction Co., Ltd.
International Classes:
C12M1/40; C02F3/30; C02F3/34; (IPC1-7): C02F3/30; C02F3/34; C12M1/40
Domestic Patent References:
| JP564799A | ||||
| JP5177197A | ||||
| JP6336898A | ||||
| JP5169091A |
Attorney, Agent or Firm:
Kenzo Matsuura
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