JPS55157382A - Reducing method for active sludge generation quantity - Google Patents

Reducing method for active sludge generation quantity

Info

Publication number
JPS55157382A
JPS55157382A JP6560179A JP6560179A JPS55157382A JP S55157382 A JPS55157382 A JP S55157382A JP 6560179 A JP6560179 A JP 6560179A JP 6560179 A JP6560179 A JP 6560179A JP S55157382 A JPS55157382 A JP S55157382A
Authority
JP
Japan
Prior art keywords
active sludge
aeration
waste water
aeration tank
sludge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6560179A
Other languages
Japanese (ja)
Inventor
Norio Shimizu
Yoji Otahara
Yasunori Mazaki
Kazuo Miyazaki
Kunji Sugimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6560179A priority Critical patent/JPS55157382A/en
Publication of JPS55157382A publication Critical patent/JPS55157382A/en
Pending legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Activated Sludge Processes (AREA)

Abstract

PURPOSE: To reduce the produced quantity of surplus sludge through efficient performance of waste water clarification and self-digestion of active sludge by a method wherein waste water treated in the first aeration tank is guided into the second aeration tank where aeration is conducted to digest biological solid in active sludge.
CONSTITUTION: Waste water 13 contg. soluble organic material is guided, together with returned active sludge 27, into the first aeration tank 16 where aeration is performed to reach a 90% or more soluble BOD removal ratio. Then, treated waste water 19 contg. active sludge is introduced into the second aeration tank 20, where aeration is conducted until the active sludge concentration becomes lower at the outlet of the second aeration tank than at its inlet, which means sufficient digestion of biological solid in the sludge. Then, the water is guided into a settling tank 24 and solid and liquid are separated.
COPYRIGHT: (C)1980,JPO&Japio
JP6560179A 1979-05-29 1979-05-29 Reducing method for active sludge generation quantity Pending JPS55157382A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6560179A JPS55157382A (en) 1979-05-29 1979-05-29 Reducing method for active sludge generation quantity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6560179A JPS55157382A (en) 1979-05-29 1979-05-29 Reducing method for active sludge generation quantity

Publications (1)

Publication Number Publication Date
JPS55157382A true JPS55157382A (en) 1980-12-08

Family

ID=13291695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6560179A Pending JPS55157382A (en) 1979-05-29 1979-05-29 Reducing method for active sludge generation quantity

Country Status (1)

Country Link
JP (1) JPS55157382A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS588587A (en) * 1981-07-07 1983-01-18 Keizo Sekine Closed activated-sludge system for treating organic waste water

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4919584A (en) * 1972-06-15 1974-02-21
JPS5387573A (en) * 1977-01-12 1978-08-02 Osaka Gas Co Ltd Treatment of wastewater with activated sludge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4919584A (en) * 1972-06-15 1974-02-21
JPS5387573A (en) * 1977-01-12 1978-08-02 Osaka Gas Co Ltd Treatment of wastewater with activated sludge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS588587A (en) * 1981-07-07 1983-01-18 Keizo Sekine Closed activated-sludge system for treating organic waste water
JPH0375235B2 (en) * 1981-07-07 1991-11-29

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