Apparatus and method for treating waste water containing ammonium salts
US11820690B2 · kind B2 · utility
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Key dates
| Filing date | Sep 29, 2020 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Mar 23, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2301/08
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a method for treating waste water containing ammonium salts, sodium sulfate crystal is obtained by freezing crystallization, then the pH value of the waste water is adjusted to a specific range, and next sodium chloride crystal and ammonia water is obtained by evaporation. Alternatively, the pH value of the waste water is adjusted to a specific range, then sodium chloride crystal and ammonia water is obtained by evaporation, and next sodium sulfate crystal is obtained by freezing crystallization. This method can recover ammonia, sodium sulfate, and sodium chloride from the waste water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.