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JPS55134613A - Control method for extraction of sludge - Google Patents

Control method for extraction of sludge

Info

Publication number
JPS55134613A
JPS55134613A JP4205979A JP4205979A JPS55134613A JP S55134613 A JPS55134613 A JP S55134613A JP 4205979 A JP4205979 A JP 4205979A JP 4205979 A JP4205979 A JP 4205979A JP S55134613 A JPS55134613 A JP S55134613A
Authority
JP
Japan
Prior art keywords
output
opening
deviation
sludge
weir
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
JP4205979A
Other languages
Japanese (ja)
Inventor
Nobutsugu Kato
Masami Koide
Hitoshi Ogasawara
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 JP4205979A priority Critical patent/JPS55134613A/en
Publication of JPS55134613A publication Critical patent/JPS55134613A/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 stabilize the extraction of sludge by a method wherein the quantity of overflow from an overflow weir mounted at an outlet of a sludge pit is controlled.
CONSTITUTION: A weir opening detector 18 is installed to an overflow weir 8 and a return sludge flow meter 19 at the outlet side of a pump 5. Output from the flow meter 19 is converted into electric signals by means of a flow rate transducer 20, and inputted to a function generator 25. The function generator 25 puts out the opening of the overflow weir 8, but the output is inputted to a subtracter 24 with output from an opening transducer 21 to which actual opening is inputted, and the subtracter 24 puts out the deviation. Output from the subtracter 24 controls a motor 22 through a drive circuit 22 only when the deviation is larger than allowable deviation by letting the output pass through a three position controller 23, thus controlling the opneing of the weir. The control of opening is continued until the deviation becomes smaller than allowable deviation.
COPYRIGHT: (C)1980,JPO&Japio
JP4205979A 1979-04-09 1979-04-09 Control method for extraction of sludge Pending JPS55134613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4205979A JPS55134613A (en) 1979-04-09 1979-04-09 Control method for extraction of sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4205979A JPS55134613A (en) 1979-04-09 1979-04-09 Control method for extraction of sludge

Publications (1)

Publication Number Publication Date
JPS55134613A true JPS55134613A (en) 1980-10-20

Family

ID=12625522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4205979A Pending JPS55134613A (en) 1979-04-09 1979-04-09 Control method for extraction of sludge

Country Status (1)

Country Link
JP (1) JPS55134613A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5605660A (en) * 1994-04-28 1997-02-25 W. R. Grace & Co.-Conn. Process for making a multi-layer film containing recycle polymer from cross-linked films

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5605660A (en) * 1994-04-28 1997-02-25 W. R. Grace & Co.-Conn. Process for making a multi-layer film containing recycle polymer from cross-linked films

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