JPS5799392A - Removing method of cod from waste water used in washing nox - Google Patents

Removing method of cod from waste water used in washing nox

Info

Publication number
JPS5799392A
JPS5799392A JP55174299A JP17429980A JPS5799392A JP S5799392 A JPS5799392 A JP S5799392A JP 55174299 A JP55174299 A JP 55174299A JP 17429980 A JP17429980 A JP 17429980A JP S5799392 A JPS5799392 A JP S5799392A
Authority
JP
Japan
Prior art keywords
washing
cod
liquid
scrubber
discharged
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
JP55174299A
Other languages
Japanese (ja)
Inventor
Shojiro Iwai
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.)
Miura Engineering International Co Ltd
Original Assignee
Miura Engineering International Co 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 Miura Engineering International Co Ltd filed Critical Miura Engineering International Co Ltd
Priority to JP55174299A priority Critical patent/JPS5799392A/en
Publication of JPS5799392A publication Critical patent/JPS5799392A/en
Pending legal-status Critical Current

Links

Landscapes

  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Treating Waste Gases (AREA)

Abstract

PURPOSE: To easily remove COD in nitrous acid-contng. waste water at a low cost, by adding a specified amount of urea to a washing liquid discharged from a scrubber, and controlling pH of the liquid.
CONSTITUTION: To a washing liquid discharged from the alkali washing process for NOx-contng. gas in a scrubber is added 1W2.5mol of urea by 1mol of nitrous acid contained in the discharged liquid, and the liquid is adjusted at pH 4 or lower, preferably 3 or lower. According to this treatment, a nitrous COD value, for instance, in the discharged liquid can be reduced from about 12,000ppm to 500W200ppm or lower. In addition, NOx-contng. gas generated in the COD-reducing reaction is returned to the washing scrubber and purified in the scrubber.
COPYRIGHT: (C)1982,JPO&Japio
JP55174299A 1980-12-10 1980-12-10 Removing method of cod from waste water used in washing nox Pending JPS5799392A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55174299A JPS5799392A (en) 1980-12-10 1980-12-10 Removing method of cod from waste water used in washing nox

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55174299A JPS5799392A (en) 1980-12-10 1980-12-10 Removing method of cod from waste water used in washing nox

Publications (1)

Publication Number Publication Date
JPS5799392A true JPS5799392A (en) 1982-06-21

Family

ID=15976231

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55174299A Pending JPS5799392A (en) 1980-12-10 1980-12-10 Removing method of cod from waste water used in washing nox

Country Status (1)

Country Link
JP (1) JPS5799392A (en)

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