Title:
DENITRIFICATION AND DEPHOSPHORIZATION METHOD IN OXIDATION DITCH
Document Type and Number:
Japanese Patent JP3634403
Kind Code:
B2
Abstract:
PURPOSE: To provide a treating method small in installation space than conventional oxidation ditch and capable of providing stable denitrificaton and dephosphorization performance.
CONSTITUTION: In the oxidation ditch method for treating sewage with a high concn. activated sludge by providing a mechanical aeration machine 8 to a circulation water passage type aeration tank 7, a flow rate control tank 4 is provided at a preceding stage of the aeration tank 7. Then, a sludge settled at a sedimentation tank 9 is returned to the flow rate control tank 4 and mixed with an influent sewage to make sludge in completely anaerobic state, then returned to the aeration tank 7.
Inventors:
Teruhisa Yoshida
Application Number:
JP11212794A
Publication Date:
March 30, 2005
Filing Date:
April 26, 1994
Export Citation:
Assignee:
Hitachi Kiden Kogyo Co., Ltd.
International Classes:
C02F3/14; C02F3/34; (IPC1-7): C02F3/14; C02F3/34
Domestic Patent References:
| JP61125494A | ||||
| JP3238095A | ||||
| JP6366596B2 |
Attorney, Agent or Firm:
Osamu Mori
Previous Patent: METHOD AND DEVICE FOR INFORMATION PROCESSING
Next Patent: POROUS CALCIUM CARBONATE COMPOUND AND PRODUCTION THEREOF
Next Patent: POROUS CALCIUM CARBONATE COMPOUND AND PRODUCTION THEREOF