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. 13, 2022
Filed:
Dec. 14, 2018
Applicant:
Kemira Oyj, Helsinki, FI;
Inventors:
Joonas Likander, Espoo, FI;
Rosa Carceller, Espoo, FI;
Assignee:
Kemira Oyj, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 265/10 (2006.01); C02F 1/56 (2006.01); C02F 11/147 (2019.01); C08L 33/26 (2006.01); C02F 103/32 (2006.01);
U.S. Cl.
CPC ...
C08F 265/10 (2013.01); C02F 1/56 (2013.01); C02F 11/147 (2019.01); C08L 33/26 (2013.01); C02F 2103/32 (2013.01); C08L 2312/00 (2013.01);
Abstract
A method for dewatering of biological sludge is disclosed. The method includes addition of a flocculant to a biological sludge, which includes an aqueous phase and a suspended solid organic material, flocculating and dewatering the sludge. The flocculant includes a polymer composition, which includes a cationic crosslinked first polymer, which is selected from crosslinked polyamines, and a cationic second polymer, which is a polymer obtained by polymerization of (meth)acrylamide and cationic monomers, the second cationic polymer being polymerized in presence of the cationic first polymer.