Underdrain for a filter system for filtering water or wastewater
US9072989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2012 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Apr 29, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D24/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An apparatus for use in a filter system for filtering water or wastewater. The apparatus includes at least one underdrain lateral. The at least one underdrain lateral has at least an inner chamber, a first outer chamber and a second outer chamber. The first outer chamber and the second outer chamber are preferably in fluid communication with the inner chamber. The inner chamber, the first outer chamber and the second outer chamber are preferably formed by an inner liner and an outer liner. The outer liner is a separate piece from the inner liner and surrounds the inner liner. The inner chamber is preferably configured to simultaneously receive a liquid and a gas during a washing procedure including simultaneous use of a liquid and gas to clean a filter bed to create a liquid and gas interface in the inner chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.