Process for removal of selenium from water by dithionite ions
US11535537B2 · kind B2 · utility
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5References
12Claims
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Key dates
| Filing date | Oct 26, 2015 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Sep 15, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/18
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for efficiently removal of oxidised selenium from liquid, such as FGD wastewater. The method involves adding a non-iron-based reducing agent (e.g. sodium dithionite) and preferably Fe(II) ions to the liquid at a pH of above 7.5 or 8 and precipitating elemental selenium from the liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.