Process for biologically purifying sewage on a bed of granular material
US4800021A · kind A · utility
66Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W10/10
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Water is purified according to the principle of a biomass fixed on an aerated granular bed acting as a filter in a biological reactor. The water to be purified is sent, without presettling, upwardly through a multilayer granular bed placed in the reactor. The injection point of oxygenated gas determines two succesive zones, anaerobic and then aerobic. The water is evacuated from the reactor at the top thereof, or at a certain level of the bed. A sudden downward flushing of the filter with water is provided to eliminate the biomass. The filter is periodically washed with air/water and then rinsed with water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.