Filtration of sewage sludge
US4481115A · kind A · utility
5Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1983 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Feb 10, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/03
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An organic suspension, such as sewage sludge, is conditioned by adding a conditioner and then filtering the suspension through a filter element to form a filter cake on the element. Improved dryness properties of the cake are obtained by using as conditioner during the formation of at least the first half (by weight solids), but not all, of the cake a high molecular weight polyelectrolyte conditioner and by using as conditioner during the formation of the remainder of the cake an inorganic conditioner or a low molecular weight polyelectrolyte conditioner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.