Apparatus and method for treating waste water containing ammonium salts
US10815132B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 20, 2018 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Apr 20, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2301/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to the waste water treatment field, and discloses apparatus and method for treating waste water containing ammonium salts, which contains NH4+, SO42−, Cl−, and Na+. In the method of the present invention, the pH value of the waste water to be treated is adjusted to a specific range in advance; sodium sulfate crystal and relatively concentrated ammonia are obtained by first evaporation, and then sodium chloride crystal and relatively dilute ammonia is obtained by second evaporation; alternatively, sodium chloride crystal and relatively concentrated ammonia is obtained by third evaporation, and then sodium sulfate crystal and relatively dilute ammonia are obtained by fourth evaporation. The method of the present invention can recover ammonia, sodium sulfate, and sodium chloride from the waste water respectively, so that the resources in the waste water can be reused as far as possible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.