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. 09, 2010
Filed:
Jul. 20, 2005
Kenzou Sugaya, Kagawa, JP;
Hiroichi Kawasaki, Kagawa, JP;
Masayoshi Katayama, Kagawa, JP;
Manabu Yamashita, Kagawa, JP;
Masaharu Miyawaki, Kagawa, JP;
Kenzou Sugaya, Kagawa, JP;
Hiroichi Kawasaki, Kagawa, JP;
Masayoshi Katayama, Kagawa, JP;
Manabu Yamashita, Kagawa, JP;
Masaharu Miyawaki, Kagawa, JP;
Ishigaki Company Limited, Tokyo, JP;
Abstract
A differential rate rotary thickener; a power detector which is disposed in a sludge receiver tank for thickened sludge thickened in the differential rate rotary thickener; a discriminator which receives an electric signal for a thickened sludge concentration (X) detected by the power detector and which calculates and discriminate the data; a first controller which receives an instruction signal being a discriminated result in the discriminator and which operates an outer cylinder driving machine and a screw driving machine; a ratio setter which receives a discriminated signal of the discriminator and which increases or decreases a chemical feed rate (α) of flocculant stepwise; and a second controller which receives an instruction signal from the ratio setter and which operates a flocculant-feeding pump are provided. Thickening of sludge is performed by controlling the chemical feed rate (α), a rotational speed (S) of a screw, and a rotational speed (C) of an outer cylinder screen.