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:
May. 20, 1980
Filed:
Dec. 06, 1977
Applicant:
Inventors:
Norio Shimizu, Hitachi, JP;
Youji Odawara, Hitachi, JP;
Tetsuo Yamaguchi, Hitachi, JP;
Setsuo Saitou, Hitachi, JP;
Azuma Nakaoka, Chiba, JP;
Kazuaki Ichihashi, Yamaguchi, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02C / ; C02C / ;
U.S. Cl.
CPC ...
210205 ; 210220 ; 261 77 ; 261123 ;
Abstract
Waste water containing organic materials is introduced into an aeration tank, and is subjected to aeration treatment in the presence of activated sludge, while supplying oxygen to the aeration tank. The tank provided with an air diffusion pipe at the bottom of the tank, an air dispersion device above the air diffusion pipe and a plurality of inside cylinders above the air dispersion device. An overall circulating stream and partial circulating streams are generated in the aeration tank.