Process for dewatering sludges in filter presses
US5075012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Jul 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/04
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.