Sewage sludge dewatering
US4196077A · kind A · utility
6Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1975 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Nov 19, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F11/002
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Substantial dewatering of a secondary sewage sludge stream is obtained by admixing same with various hydrocarbon oils, the initial sludge/oil weight ratio being maintained in an amount less than 0.6, at shear rates of at least 130 seconds.sup.-1, and allowing the mixture thus formed to settle at temperatures of at least 72.degree. F. Substantially complete disposal of the solids thus removed from the secondary sludge stream can be achieved by subjecting same to evaporation and incineration processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.