JPS5799392A - Removing method of cod from waste water used in washing nox - Google Patents
Removing method of cod from waste water used in washing noxInfo
- 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
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
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) |
-
1980
- 1980-12-10 JP JP55174299A patent/JPS5799392A/en active Pending
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