Process for separation of ash from waste activated sludge
US4541933A · kind A · utility
Inventors
Key dates
| Filing date | May 14, 1984 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | May 14, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D35/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process and apparatus for removal of ash from a waste activated sludge stream includes a pressure regulator for controlling the pressure of incoming waste activated sludge containing water or supernatant, carbon and ash as suspended solids; a first stage separation including a plurality of parallel mounted hydrocyclones for receiving the controlled pressure incoming waste activated sludge for separation into a first fluid output containing substantially supernatant and carbon and a second fluid output containing a greater concentration of ash; and a second separation stage including a vibrating screen which receives the second fluid output from the first separation stage, such vibrating screen allowing substantially only the passage of supernatant and carbon therethrough thus producing a third fluid output and a fourth output of ash concentrate which can be ultimately removed from the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.