Title:
METHOD FOR DECREASING QUANTITY OF ORGANIC SLUDGE
Document Type and Number:
Japanese Patent JP3447027
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively and economically decrease the quantity of org. sludge by anaerobically digesting org. sludge in an anaerobic digestion process and adding ozone or hydrogen peroxide to the digested sludge to solubilize the sludge and further anaerobically digesting the solubilized sludge.
SOLUTION: Org. sludge 1 such as sewage raw sludge or excessive activated sludge is anaerobically digested in an anaerobic digestion process 2 at first and a part easily decomposable biologically is decreased in quantity. About 60wt.% of SS of raw sludge is digested herein. The remaining digested sludge is drawn out to a chemical oxidizing process 3 and ozone or hydrogen peroxide is added to the sludge to solubilize the same. Next, the solubilized sludge is further anaerobically digested by anaerobic bacteria in a second anaerobic digestion process 4 to be decomposed to carbon dioxide and water. By this method, 90wt.% or more of raw sludge can be decreased in quantity. The digested sludge of the second anaerobic digestion process 4 is subjected to solid-liquid separation and the separated soln. 5 is drained and the solid is treated as sludge residue 6.
Inventors:
Katsuyuki Kataoka
Application Number:
JP24470095A
Publication Date:
September 16, 2003
Filing Date:
September 22, 1995
Export Citation:
Assignee:
Ebara Corporation
International Classes:
C02F11/04; C02F11/06; (IPC1-7): C02F11/04; C02F11/06
Domestic Patent References:
| JP1224100A | ||||
| JP59112899A | ||||
| JP59105897A | ||||
| JP56168896A | ||||
| JP7124597A | ||||
| JP768296A | ||||
| JP966298A |
Attorney, Agent or Firm:
Shohei Oguri (8 outside)
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