JPS5561996A - Treatment method for chemical cleaning waste water - Google Patents
Treatment method for chemical cleaning waste waterInfo
- Publication number
- JPS5561996A JPS5561996A JP13458178A JP13458178A JPS5561996A JP S5561996 A JPS5561996 A JP S5561996A JP 13458178 A JP13458178 A JP 13458178A JP 13458178 A JP13458178 A JP 13458178A JP S5561996 A JPS5561996 A JP S5561996A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- perfulfate
- chemical cleaning
- hydroxide
- cod
- 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.)
- Granted
Links
Landscapes
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
PURPOSE: To remove almost completely, as well as phosphoric acid responsible for the occurrence of red tide, such harmful substances as COD, heavy matals (mainly iron), SS, etc., present in chemical cleaning waste waters including hydrochloric acid washing water for the removal of scale and a rust-proofing liquid of phosphoric acid to within the effluent standard values.
CONSTITUTION: A calciun compound, e.g., calcium hydroxide, calcium chloride, etc., and an alkali compoond, e.g., sodium hydroxide, etc., are jointly added to a chemical cleaning waste water to precipitate phosphates and heavy metals such as iron, copper, etc., in the forms of calcium phosphate and heavy metal hydroxides, and then air is blown into the waste water to oxidize reductive ferrous hydroxide to ferric hydroxide. Furthermore, a perfulfate, e.g., ammonium perfulfate, sodium perfulfate, or potassium persulfate, is added to the waste water in an amount more than equivalent of COD present in the waste water to oxidize and decompose the COD components. Thus, harmful substances can be removed to within the effluent standard values as shown in the table, which are extracted from examples in each place.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13458178A JPS5561996A (en) | 1978-11-02 | 1978-11-02 | Treatment method for chemical cleaning waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13458178A JPS5561996A (en) | 1978-11-02 | 1978-11-02 | Treatment method for chemical cleaning waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5561996A true JPS5561996A (en) | 1980-05-10 |
| JPS6159799B2 JPS6159799B2 (en) | 1986-12-18 |
Family
ID=15131700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13458178A Granted JPS5561996A (en) | 1978-11-02 | 1978-11-02 | Treatment method for chemical cleaning waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5561996A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047457A (en) * | 1973-08-30 | 1975-04-26 | ||
| JPS5315297A (en) * | 1976-07-28 | 1978-02-10 | Hitachi Zosen Corp | Production of caustic soda and hydrogen chloride by diaphragm electrolysis of molten salt |
| JPS5334182A (en) * | 1976-09-13 | 1978-03-30 | Hitachi Ltd | Method of detecting abnormality in coil spring feed device |
-
1978
- 1978-11-02 JP JP13458178A patent/JPS5561996A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5047457A (en) * | 1973-08-30 | 1975-04-26 | ||
| JPS5315297A (en) * | 1976-07-28 | 1978-02-10 | Hitachi Zosen Corp | Production of caustic soda and hydrogen chloride by diaphragm electrolysis of molten salt |
| JPS5334182A (en) * | 1976-09-13 | 1978-03-30 | Hitachi Ltd | Method of detecting abnormality in coil spring feed device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6159799B2 (en) | 1986-12-18 |
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