Sewage treatment
US4196074A · kind A · utility
3Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1977 |
| Grant date | Apr 1, 1980 |
| Priority date | — |
| Expiry date | Nov 16, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/921
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Oxygen containing gas is dissolved in sewage passing to, or through, a sewer during periods when sewage is being pumped therethrough. A stream of the sewage is withdrawn during periods when sewage is being held in the sewer. This stream is passed through a conduit so as to promote in such a stream dissolution of oxygen-containing gas introduced into, or entrained in, the stream. The stream is then returned to the sewer. By this means a chosen concentration of dissolved oxygen may be maintained in the volume of sewage between the points of withdrawal and return of the stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.