Method for dewatering of biological sludge using a polymeric flocculant
US11525022B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Dec 14, 2018 |
| Grant date | Dec 13, 2022 |
| Priority date | — |
| Expiry date | Apr 12, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2312/00
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.