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. 17, 1995
Filed:
Jun. 10, 1992
Makoto Thogho, Tokyo, JP;
Tamotsu Hattori, Tokyo, JP;
Noboru Okazaki, Tokyo, JP;
Kozaburo Akamatus, Chiba, JP;
Tomoyuki Hayashi, Saitama, JP;
Tomohiko Kusumi, Saitama, JP;
Tokyo Metropolitan, Tokyo, JP;
Tokyo Metropolitan Sewerage Service Corp., Tokyo, JP;
Japan Organo Co., Ltd., Tokyo, JP;
Abstract
The feature of the present invention resides in that when a polyelectrolyte coagulant is added to sludge to dewater the sludge in a sewage treatment plant, the dosage level of the polyelectrolyte coagulant to be to the sludge is controlled most properly, whereby moisture content of dewatered cake can be minimized. This control can be achieved by feeding the coagulant to a sludge feed pipe (3) by means of a coagulant feed pump (6) to carry out a coagulation reaction, dewatering tie sludge by a dewatering means (4), measuring a capillary suction time (CST) of the resultant filtrate (8) by a CST measuring means (10), and then controlling the addition of the coagulant by the coagulant pump (6) so that the filtrate CST value may be minimized