Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2007-08-21
2007-08-21
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S613000, C210S626000, C210S631000
Reexamination Certificate
active
11069063
ABSTRACT:
The pH value of excess sludge taken out from a biological oxidation tank (2) is adjusted to 8 to 14, and the pH-adjusted sludge is injected into a solubilizing device (3). The sludge taken out from the solubilizing device (3) is heated to 110° C. to 350° C. at a pressure higher than saturated steam pressure to solubilize the sludge to a state readily degradable by microorganisms. The solubilized sludge is returned to a biological oxidizing tank (2), and the pH value of the sludge in the biological oxidizing tank (2) to 5 to 9. The use of the above method of treating excess sludge and an apparatus therefore enables substantially reducing the volume of excess sludge with economic advantage.
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Barry Chester T.
Koga Takeshi
Kratz Quintos & Hanson, LLP
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