Method of simultaneous air-water wash of multiple-media filters
US4322299A · kind A · utility
28Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1980 |
| Grant date | Mar 30, 1982 |
| Priority date | — |
| Expiry date | Aug 18, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D24/4694
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method is described in which two or more granular filter media are used in combination in such a manner that the filter bed is backwashed using air and water simultaneously. The media size gradation and density are selected so that, although the media may be mixed during backwash, the media are separated into layers according to their density and/or size following termination of the simultaneous air-water wash and prior to returning the filter to the filtration mode. The simultaneous air-water wash step can be carried out without media loss by use of an appropriate media retaining procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.