Title:
TREATMENT OF ORGANIC SEWAGE
Document Type and Number:
Japanese Patent JP3383498
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a treating method in which a biological treatment of an org. sewage is execute without causing a sludge to foam in an ozone contact tank, eliminating the need of a device detoxicating a waste gaseous ozone and hardly generating a surplus sludge with a simple process.
SOLUTION: In this treating method, after subjecting the org. sewage to the biological treatment, an org. sludge flowing out from a biologically treating tank is subjected to a solid-liq. separation, and a treated water is discharged out of system, and a separated sludge 6 is returned to the biologically treating tank. In this case, the ozone is added to a return sludge passage 9 for returning the separated sludge 6 to the biologically treating tank so that its addition quantity is increased and decreased with the lapse of a time. An intermittent ozone generating device is preferably used as an ozone generating device. A closed passage is preferably used as the return sludge passage 9. Moreover, the sludge is more preferably returned to the biologically treating tank while containing a residual ozone in the soluble sludge.
Inventors:
Katsuyuki Kataoka
Application Number:
JP31226295A
Publication Date:
March 04, 2003
Filing Date:
November 30, 1995
Export Citation:
Assignee:
Ebara Corporation
International Classes:
C02F3/12; C02F1/78; C02F11/06; (IPC1-7): C02F3/12; C02F11/06
Domestic Patent References:
| JP7116685A | ||||
| JP61141603A | ||||
| JP8252593A | ||||
| JP9150184A | ||||
| JP5719719B1 |
Attorney, Agent or Firm:
Shohei Oguri (8 outside)