JPS5638196A - Concentrating method for sludge - Google Patents

Concentrating method for sludge

Info

Publication number
JPS5638196A
JPS5638196A JP11353779A JP11353779A JPS5638196A JP S5638196 A JPS5638196 A JP S5638196A JP 11353779 A JP11353779 A JP 11353779A JP 11353779 A JP11353779 A JP 11353779A JP S5638196 A JPS5638196 A JP S5638196A
Authority
JP
Japan
Prior art keywords
sludge
nitrite
time
reaction
surplus
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
JP11353779A
Other languages
Japanese (ja)
Inventor
Kazuyuki Ito
Katsuya Ebara
Shigeoki Nishimura
Sankichi Takahashi
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.)
Hitachi Plant Technologies Ltd
Original Assignee
Hitachi Plant Technologies 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 Hitachi Plant Technologies Ltd filed Critical Hitachi Plant Technologies Ltd
Priority to JP11353779A priority Critical patent/JPS5638196A/en
Publication of JPS5638196A publication Critical patent/JPS5638196A/en
Pending legal-status Critical Current

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  • Treatment Of Sludge (AREA)

Abstract

PURPOSE: To effectively concentrate the sludge, by adding nitrate or nitrite in surplus sludge or mixed sludge to promote the denitrifying reaction by denitrifying bacteria and then floating the sludge by N2 gas generated on this occasion.
CONSTITUTION: Surplus sludge produced at the time of treating waste water such as sewage of all kinds of industrial waste water, by activated sludge method, is concentrated as follows. Nitrate such as NaNO3 etc. or nitrite such as NaNO2 etc., is added to the surplus sludge or mixed sludge so as to nitiric acid or nitrous acid type N component exists at about ≥7W8ppm in the sludge. NO3-N or NO2-N in the sludge is increased by said addition treatment and denitrif reaction is promoted and generating quantity of N2 is increased. As a result, the sludge is positively floated and concentrated by air bubbles at the time of N2 generation. Further, treating condition other than adding nitrate or nitrite is the normal condition at the time of performing denitrifying reaction, for example, it is suitable to be in the range of 0W50°C, especially 25±5°C and 6W8pH.
COPYRIGHT: (C)1981,JPO&Japio
JP11353779A 1979-09-06 1979-09-06 Concentrating method for sludge Pending JPS5638196A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11353779A JPS5638196A (en) 1979-09-06 1979-09-06 Concentrating method for sludge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11353779A JPS5638196A (en) 1979-09-06 1979-09-06 Concentrating method for sludge

Publications (1)

Publication Number Publication Date
JPS5638196A true JPS5638196A (en) 1981-04-13

Family

ID=14614825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11353779A Pending JPS5638196A (en) 1979-09-06 1979-09-06 Concentrating method for sludge

Country Status (1)

Country Link
JP (1) JPS5638196A (en)

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