Advancements in osmotically driven membrane systems including multi-stage purification
US10500544B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Mar 14, 2014 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Sep 21, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An example water purification system for purifying high concentration feed solutions includes a high rejection forward osmosis module, one or more low rejection modules, and a high rejection reverse osmosis module. The low rejection modules may have different rejection levels. The system may be pressurized by one or more pumps. One or more of the low rejection modules may include one or more nanofiltration (NF) membranes. The draw solution may comprise a monovalent salt, a multivalent salt, or a combination of both.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.