Aerobic digestion of sludge
US4587019A · kind A · utility
8Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1985 |
| Grant date | May 6, 1986 |
| Priority date | — |
| Expiry date | Jan 11, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In the aerobic digestion of sludges, particularly but not exclusively primary sedimentation sewage sludges, a layer of sludge foam is deliberately maintained over the sludge surface to improve the efficiency of the process. The layer of foam may have a volume of at least 50% of that of the sludge. The digestion process is effected in a digester, in which the amount of foam may be reduced (as necessary) by injecting sludge directly into the foam to cause local collapse thereof. A digester vessel especially suited for use in the process is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.