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:
Jan. 11, 2005
Filed:
Mar. 11, 2002
Yoshihiko Nakayama, Nagoya, JP;
Atsushi Miyata, Nagoya, JP;
Yoshihiko Nakayama, Nagoya, JP;
Atsushi Miyata, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
The present invention relates to the raw water-filtering technical field, and is to provide a high speed filtering apparatus which can filter a great amount of raw water containing suspended substances (SS) at a high concentration at a high speed. Floating filter mediawhich are composed of a foamed polymer having an apparent density of 0.1 to 0.4 g/cmand a 50% compression hardness of not less than 0.1 MPa and have uneven shapes or cylindrical shapes with sizes of 4 to 10 mm, are charged into an up-flow type filtering towerThe raw water containing SS at a high concentration is filtered by passing it through the filtering towerat a linear water-passing speed of 100 to 1000 m/day. While the floating filter mediaare not compacted, a high SS-capturing percentage can be obtained. Back washing can be also effected at a high linear washing speed of 1.2 to 4.0 m/min.