JPS562013A - Ph controller - Google Patents

Ph controller

Info

Publication number
JPS562013A
JPS562013A JP7678779A JP7678779A JPS562013A JP S562013 A JPS562013 A JP S562013A JP 7678779 A JP7678779 A JP 7678779A JP 7678779 A JP7678779 A JP 7678779A JP S562013 A JPS562013 A JP S562013A
Authority
JP
Japan
Prior art keywords
value
rate
sludge
injection
reference value
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
JP7678779A
Other languages
Japanese (ja)
Inventor
Kenichi Kimura
Etsuo Yagyu
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
Hitachi Industry and Control Solutions Co Ltd
Original Assignee
Hitachi Engineering Co Ltd Ibaraki
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 Ibaraki, Hitachi Ltd filed Critical Hitachi Engineering Co Ltd Ibaraki
Priority to JP7678779A priority Critical patent/JPS562013A/en
Publication of JPS562013A publication Critical patent/JPS562013A/en
Pending legal-status Critical Current

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  • Control Of Non-Electrical Variables (AREA)

Abstract

PURPOSE: To exercise the best pH control by a pH controller used for industrial waste water disposal by making pH adjustment within a coagulation zone of pH determined by a jar test and also by detecting how much sludge is bred in the interval of sludge drainage.
CONSTITUTION: The best pH value for coagulation-settling of the hydrated matter of industrial waste water has its upper-limited and lower-limited set values determined by a jar test. Then, the obtained values are set by pH setting switch 7; when the pH value of processed water is within the set range, the value is considered to be a reference value and when not, one pH value within the range is regarded as the reference value. Then, alkali-agent injection-rate determining circuit 11 determines the rate of injection on the basis of the deviation of the pH value of feed water before process from the reference value. Further, how much sludge is bred in the intervals of detected-sludge drainage is detected and corresponding to a difference between the best pH value and a desired pH value obtained by circuit 11, injection-rate correcting circuit 14 makes correction increasing the change rate of the desired pH value, so that the best pH control can be exercised.
COPYRIGHT: (C)1981,JPO&Japio
JP7678779A 1979-06-20 1979-06-20 Ph controller Pending JPS562013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7678779A JPS562013A (en) 1979-06-20 1979-06-20 Ph controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7678779A JPS562013A (en) 1979-06-20 1979-06-20 Ph controller

Publications (1)

Publication Number Publication Date
JPS562013A true JPS562013A (en) 1981-01-10

Family

ID=13615315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7678779A Pending JPS562013A (en) 1979-06-20 1979-06-20 Ph controller

Country Status (1)

Country Link
JP (1) JPS562013A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011088051A (en) * 2009-10-21 2011-05-06 Ihi Corp Waste liquid treatment equipment and waste liquid treatment method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011088051A (en) * 2009-10-21 2011-05-06 Ihi Corp Waste liquid treatment equipment and waste liquid treatment method

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