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. 26, 1996
Filed:
Jul. 12, 1995
Yasushi Funakoshi, , US;
Khoji Ogata, Nishi-Shinjuku, JP;
Masayuki Kojima, Chiyoda-ku, JP;
Hitoshi Kawaziri, Chiyoda-ku, JP;
Hirofumi Yamamoto, Chiyoda-ku, JP;
Kazuhiko Noto, Chiyoda-ku, JP;
Naomichi Mori, Chiyoda-ku, JP;
Hitachi Plant Engineering & Construction Co., Ltd., Tokyo, JP;
Other;
Abstract
A sewage treatment system is provided for cleaning sewage by filtering solid components in the sewage through use of a floating filter medium, wherein the filtration performance can be improved and the filtration cleaning can be performed efficiently. The sewage flows upwardly in the treatment tank and is filtered through the floating filter media layer made of cylindrical mesh floating filter media which have a smaller specific gravity than the sewage. To wash the floating filter medium, air is jetted from the air jetting pipes to generate a circular flow to scape off solid components adhering to the filter medium. Then the waste, which has washed the floating filter medium is discharged to the outside of the treatment tank while the air is jetted from the air jetting pipe for full jetting of the floating filter media layer unidirectionally.