JPS5653800A - Treatment of sewage sludge - Google Patents
Treatment of sewage sludgeInfo
- Publication number
- JPS5653800A JPS5653800A JP13065979A JP13065979A JPS5653800A JP S5653800 A JPS5653800 A JP S5653800A JP 13065979 A JP13065979 A JP 13065979A JP 13065979 A JP13065979 A JP 13065979A JP S5653800 A JPS5653800 A JP S5653800A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- pptd
- primarily
- dehydrated
- excess sludge
- 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 reduce treating cost remarkably, by dehydrating primarily pptd. sludge as it is, and by dehydrating excess sludge by freezethaw treatment without mixing the primarily pptd. sludge with the excess sludge.
CONSTITUTION: Primarily pptd. sludge and excess sludge are existences in general in about 6:4 ratio. The primarily pptd. sludge is led to a thickner 1a, where it is concentrated to about 5W7% solid matter concn. by natural sedimentation, then dehydrated by a dehydrator 4a e.g. a filter press to form dehydrated cake. The excess sludge is concentrated in a thickner 1b to about 1W1.5% solid matter concn., then to about 8% solid matter concn. by centrifugal separator 2. After adjusted to about pH3, the concd. excess sludge is led to a freeze-thaw unit 3, where it is frozen, then melted once again. Susequently it is dehydrated by a dehydrator 4b to be dischargedas the dehydrated cake. The primarily pptd. sludge and the excess sludge are allowed to be dehydrated after mixed. This method the treatment cost remarkably compared with conventional method.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13065979A JPS5653800A (en) | 1979-10-08 | 1979-10-08 | Treatment of sewage sludge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13065979A JPS5653800A (en) | 1979-10-08 | 1979-10-08 | Treatment of sewage sludge |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5653800A true JPS5653800A (en) | 1981-05-13 |
Family
ID=15039528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13065979A Pending JPS5653800A (en) | 1979-10-08 | 1979-10-08 | Treatment of sewage sludge |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5653800A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827700A (en) * | 1981-08-13 | 1983-02-18 | Ebara Infilco Co Ltd | Treatment of sewage sludge |
JPS5855098A (en) * | 1981-09-29 | 1983-04-01 | Mitsubishi Electric Corp | Freeze thaw type treating device for sludge |
-
1979
- 1979-10-08 JP JP13065979A patent/JPS5653800A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5827700A (en) * | 1981-08-13 | 1983-02-18 | Ebara Infilco Co Ltd | Treatment of sewage sludge |
JPS5855098A (en) * | 1981-09-29 | 1983-04-01 | Mitsubishi Electric Corp | Freeze thaw type treating device for sludge |
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