JPS56115699A - Dehydration of sludge of night soil purifying tank - Google Patents
Dehydration of sludge of night soil purifying tankInfo
- Publication number
- JPS56115699A JPS56115699A JP1943780A JP1943780A JPS56115699A JP S56115699 A JPS56115699 A JP S56115699A JP 1943780 A JP1943780 A JP 1943780A JP 1943780 A JP1943780 A JP 1943780A JP S56115699 A JPS56115699 A JP S56115699A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- freeze
- dehydration
- thawing
- purifying tank
- 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 Sludge (AREA)
Abstract
PURPOSE: To enable dehydration without any worry for increase in the amount of dehydrated cake and inclusion of heavy metals by simply adding an acid to titled sludge to control the same to specific pH, then freeze-thawing and dehydrating the same.
CONSTITUTION: First, an acid, for example, sulfuric acid, is added to the sludge of an aeration type or putrefaction type night soil purifying tank or a mixture of these sludges, whereby the pH thereof is controlled to 1.5W4.5, more preferably 2.0W 4.0. Thereafter, this sludge is subjected to freeze-thawing in a freeze-thawing device, whereby it is sufficiently improved of dehydrating characteristic, after which it is dehydrated with a dehydrator. In such method, no flocculants to be added are necessary; hence, the cost of treatment is lower.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1943780A JPS56115699A (en) | 1980-02-19 | 1980-02-19 | Dehydration of sludge of night soil purifying tank |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1943780A JPS56115699A (en) | 1980-02-19 | 1980-02-19 | Dehydration of sludge of night soil purifying tank |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56115699A true JPS56115699A (en) | 1981-09-10 |
Family
ID=11999259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1943780A Pending JPS56115699A (en) | 1980-02-19 | 1980-02-19 | Dehydration of sludge of night soil purifying tank |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56115699A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107793001A (en) * | 2017-09-21 | 2018-03-13 | 北京工业大学 | Can winter construction absorption solidification heavy metal ion river sludge treatment agent |
-
1980
- 1980-02-19 JP JP1943780A patent/JPS56115699A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107793001A (en) * | 2017-09-21 | 2018-03-13 | 北京工业大学 | Can winter construction absorption solidification heavy metal ion river sludge treatment agent |
CN107793001B (en) * | 2017-09-21 | 2021-01-01 | 北京工业大学 | River sludge treating agent capable of being constructed in winter and used for adsorbing and curing heavy metal ions |
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