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:
Apr. 04, 1989
Filed:
Sep. 03, 1987
Youichi Hamamoto, Tokyo, JP;
Nishihara Om-Tech Co., Ltd., Tokyo, JP;
Nishihara Environmental Sanitation Research Corp. Ltd., Tokyo, JP;
Abstract
The present invention is concerned with an intermittent aeration type biological treatment process and system, wherein waste water is caused to flow into an aeration tank, and aeration is repeatedly stopped and started in the aeration tank to treat the waste water. Concentration values of dissolved oxygen during aeration of the waste water in the aeration tank are continuously measured by a dissolved oxygen concentration measuring device provided in the aeration tank. Deficient values of dissolved oxygen and dissolved oxygen variation values at predetermined time intervals are calculated from the values thus measured. The deficient values and variation values are integrated and processed by an oxygen requirement value calculating-integrating operation unit to calculate an oxygen requirement value for the activated sludge in the current aeration step. The necessary aeration time duration for the succeeding step is obtained from the value of this oxygen requirement value, to thereby control the operating time duration of the aeration device. By use of the process and the system, wasteful operating energy can be eliminated and satisfactory treated water can be constantly obtained.