Reducing waste water in reverse osmosis residential drinking water systems
US8083936B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Mar 3, 2009 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Sep 25, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The production of purified water from a residential reverse osmosis drinking water system is limited by the pressure build up in the holding tank or reservoir. While the pressure in the tank increases the brine or waste water continues to flow at a constant rate. This condition makes an undesirable out of proportion relationship between the purified water and the waste water. The production of product water is controlled by the differential pressure across the purification membrane, as the tank pressure increases the differential pressure decreases and reduced production of product water results. The purpose of the device is to utilize the increasing tank pressure as a force to actuate the valve that proportions the waste water in a direct relationship with the product water. The ratio between the product water and the waste water remains constant during the period that purified water is being delivered to the holding tank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.