Cleaning system for filter beds
US9802141B1 · kind B1 · utility
2Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2014 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Mar 17, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2303/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cleaning system for filter beds uses the existing permanent infrastructure of a water filtration plant. Treatment fluids of opposite pH are introduced into a pair of filter cells that are separated by a gullet. Each filter cell contains a filter bed. One filter cell receives an acidic treatment fluid and the other receives an alkaline treatment fluid. After treatment is complete, the treatment fluids from each filter cell are simultaneously drained into the gullet, where mixing and neutralization occur. The resulting spent treatment fluid has an intermediate pH that allows it to be safely drained into a wastewater sewer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.