Method for processing sludge
US8147703B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 2007 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Oct 5, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/06
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention relates to a method for processing sludge, comprising the addition of a lime-based basic agent to a sludge having a first pH value in order to raise the pH to a second value higher than the first one, adding at least one anionic organic flocculating agent that is active at said second pH value, flocculating the sludge, and separating the flocculated sludge between dehydrated sludge and a liquid phase, wherein the sludge to be dehydrated has a first above-mentioned pH value lower than 9, while the lime-based basic agent induces said pH raise to said above-mentioned second value within less than 5 minutes. The invention also relates to a composition for implementing said processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.