The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2008
Filed:
Sep. 21, 1994
Hidenari Yasui, Tokyo, JP;
Masahide Shibata, Tokyo, JP;
Hidenari Yasui, Tokyo, JP;
Masahide Shibata, Tokyo, JP;
Kurita Water Industries Ltd., Tokyo, JP;
Abstract
A process and an apparatus for an aerobic biological treatment of aqueous organic wastes, in which the aqueous organic waste is supplied to an aeration tank for an aerobic biological treatment in the presence of a biosludge composed essentially of aerobic microorganisms. The aerated aqueous suspension in the aeration tank is subjected to solid/liquid, separation, the so-separated liquid phase is removed as treated water, at least a portion of the separated sludge is recycled to the aeration tank, a part of the aqueous suspension in the aeration tank or of the separated sludge is treated with ozone at a pH of 5 or lower, and the ozonized suspension or sludge is recycled to the step of aerobic biological treatment. The biosludge is transformed into BOD components using a decreased amount of ozone to thereby decrease the amount of excess sludge and, in some cases, even reduce it to zero.