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:
Nov. 12, 1996
Filed:
Dec. 21, 1994
Yoshimi Nagasaki, Kawasaki, JP;
Hidetsugu Nakazawa, Kawasaki, JP;
Ajinomoto Co., Inc., Tokyo, JP;
Abstract
Waste water is treated by an activated sludge process, the equipment for which is provided with an aeration tank unit comprised of three tanks of a first tank, a second tank and a third tank, said waste water and microorganisms being fed into the first tank while the ratio of aeration in the first tank ranges from 0.5 to 0.8 by volume/minute relative to the amount of liquid in the first tank, the ratio of aeration in the second tank ranges from 0. 1 to 0.4 by volume/minute relative to the amount of liquid in the said second tank and the ratio of aeration in the third tank ranges from 0.1 to 0.3 by volume/minute relative to the amount of liquid in the third tank, the improvement which comprises carrying out said treatment by passing air containing ozone in an amount of from 0.01 to 0.16 wt. % relative to the amount of oxygen during the aeration into the first tank.