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:
Dec. 24, 1991
Filed:
Jul. 09, 1990
Applicant:
Inventor:
Oswald Busse, Aarbergen, DE;
Assignee:
Passavant-Werke AG, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210709 ; 210712 ; 210714 ; 210778 ; 210 961 ;
Abstract
To improve the dewaterability of sludge, which is dewatered in a dewatering device, in particular a plate filter press, a polymeric filter aid is added to the sludge. Since the flocs require a certain ripening time to form, a part stream of the unfiltered sludge is to be taken off according to the invention at the point opposite the feed and recycled into the main stream. The recycled flocs serve as flocculation nuclei. A further advantage of the sludge recycle is that the floc structure and/or size can then be scanned in the recycled part stream. The representative measured results are utilized for changing parameters which determine the dewaterability.