JPS5541831A - Controlling dissolved oxygen in sewage treatment process - Google Patents

Controlling dissolved oxygen in sewage treatment process

Info

Publication number
JPS5541831A
JPS5541831A JP11449178A JP11449178A JPS5541831A JP S5541831 A JPS5541831 A JP S5541831A JP 11449178 A JP11449178 A JP 11449178A JP 11449178 A JP11449178 A JP 11449178A JP S5541831 A JPS5541831 A JP S5541831A
Authority
JP
Japan
Prior art keywords
air
dissolved oxygen
value
qal
treatment process
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
JP11449178A
Other languages
Japanese (ja)
Inventor
Nobutsugu Kato
Masaya Tanuma
Shigehiro Kawano
Masahiko Kashiwagi
Motohiro Sugiura
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 Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Engineering Co Ltd
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 Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd
Priority to JP11449178A priority Critical patent/JPS5541831A/en
Publication of JPS5541831A publication Critical patent/JPS5541831A/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

Abstract

PURPOSE: To control dissolved oxygen (DO) in an air exposure bath at a constant level, the air quantity to be fed to the air exposure bath is reduced to below the limit surge value when the quantity of sewage is reduced.
CONSTITUTION: The DO meter 11 provides measured DO value which is put in the adder 13 to obtain the deviation ΔDO from the target value. The ΔDO is calculated in the proportion-integrator 14 to provide the required air quantity QA to be sent to the air exposure bath 3. The air quantity QA is brought into the comparator 20 and compared with the surging limit value QAL. If the air quantity QA is greater than the limit value QAL (QA>QAL), the comparator 20 instructs the relay 21 that the proportion-integrator 14 connects the loop of the air control unit 24 and disconnects the loop of the air control unit 22.
COPYRIGHT: (C)1980,JPO&Japio
JP11449178A 1978-09-20 1978-09-20 Controlling dissolved oxygen in sewage treatment process Pending JPS5541831A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11449178A JPS5541831A (en) 1978-09-20 1978-09-20 Controlling dissolved oxygen in sewage treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11449178A JPS5541831A (en) 1978-09-20 1978-09-20 Controlling dissolved oxygen in sewage treatment process

Publications (1)

Publication Number Publication Date
JPS5541831A true JPS5541831A (en) 1980-03-24

Family

ID=14639076

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11449178A Pending JPS5541831A (en) 1978-09-20 1978-09-20 Controlling dissolved oxygen in sewage treatment process

Country Status (1)

Country Link
JP (1) JPS5541831A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008161850A (en) * 2007-01-04 2008-07-17 Sumiju Kansai Shisetsu Kanri Kk Dissolved oxygen controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008161850A (en) * 2007-01-04 2008-07-17 Sumiju Kansai Shisetsu Kanri Kk Dissolved oxygen controller

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