Method for nitrogen removal and nitrogen salts recovery using carboxylated cellulose extracted by nitro-oxidation
US12122687B2 · kind B2 · utility
1Cited by
1References
15Claims
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Key dates
| Filing date | Aug 28, 2019 |
| Grant date | Oct 22, 2024 |
| Priority date | — |
| Expiry date | Jul 27, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A40/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of treating contaminated water, such as wastewater, with carboxylated cellulose to remove ammonium and nitrogen-containing impurities is claimed. Carboxylated cellulose extracted by nitro-oxidation has negatively-charged functionality and forms an aggregate when exposed to positively-charged impurities in contaminated water. The aggregate, nitrogen-containing impurities, and by-products from the nitro-oxidation process can be isolated to provide a fertilizer or fertilizer component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.