Title:
DEVICE FOR BIOLOGICALLY REMOVING PHOSPHORUS
Document Type and Number:
Japanese Patent JP3473328
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve removal efficiencies of phosphorus by a method wherein sludge solubilized by a sludge solubilizing means, into which a part of return sludge is introduced, is returned to an aeration tank and a part of the return sludge is fed into a phosphorus discharge tank and an effluent of the phosphorus discharge tank is admitted into a magnesium ammonium phosphate reaction tower.
SOLUTION: In an anerobic tank 1 into which raw water is introduced, activated sludge is caused to ingest organic matters in raw water and anaerobic liquid is introduced into a denitrification tank 2 and denitrification liquid is then fed into aerobic tanks 3, 4 to effect aerobic treatment, causing oxidative decomposition of organic matters. And in the tank 1, phosphorus discharged from sludge is taken in so that aerobic treating liquid returns a part of the phosphorus to the tank 2 as circulation liquid, while the remainder is solid-liquid separated at a settling tank 5. And a part of separated sludge is introduced into the tank 1 or a solubilizing tank 6, where ozone gas is blown in to effect solubilizing treatment. The treated liquid is sent to a discharge tank 7 to discharge phosphorus to the side of liquid under anaerobic conditions and then in the magnesium ammonium phosphate(MAP) reaction tower 9, MAP is produced and deposited to remove phosphorus in the liquid.
Inventors:
Tetsuro Fukase
Masahide Shibata
Akio Ohyama
Tadao Takeuchi
Masahide Shibata
Akio Ohyama
Tadao Takeuchi
Application Number:
JP16422897A
Publication Date:
December 02, 2003
Filing Date:
June 20, 1997
Export Citation:
Assignee:
Kurita Water Industries Ltd.
International Classes:
C02F3/12; C02F1/58; C02F3/30; (IPC1-7): C02F3/30; C02F1/58; C02F3/12
Domestic Patent References:
| JP10490A | ||||
| JP839096A | ||||
| JP1015585A | ||||
| JP9122678A | ||||
| JP1119392A | ||||
| JP8290171A | ||||
| JP644295A |
Other References:
橋本 奨、他６名，新しい活性汚泥法 第４版，日本，産業用水調査会，１９９７年 ４月，第４版，５６−５８
Attorney, Agent or Firm:
Takeshi Shigeno