Method for processing aqueous effluents containing metal nitrate or nitrite salts
US7736519B2 · kind B2 · utility
0Cited by
11References
19Claims
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Key dates
| Filing date | Jun 17, 2005 |
| Grant date | Jun 15, 2010 |
| Priority date | — |
| Expiry date | Feb 12, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/913
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention relates to a method for processing an aqueous effluent (E) containing in solution at least one type of metal (M) nitrite or nitrate whose oxide is stable in an aqueous medium consisting (I) in introducing cations NH4+ in aqueous solution, generally in the form of an aqueous ammonia solution, into the aqueous effluent and, subsequently (II) in processing the obtainable medium at a temperature ranging from 100 to 700° C. and a pressure of 1-50 MPa (i.e. from 10 to 500 bar), thereby converting the metal (M) nitrite or nitrate into metal (M) oxide, nitrogen and water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.