Membrane treatment of ammonia-containing waste water
US10752533B2 · kind B2 · utility
1Cited by
21References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2015 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Apr 5, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2303/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for treating waste water containing ammonia comprising the steps of: i) passing the waste water as a feed solution through a first RO membrane (24) to produce a first permeate stream (30) and a first reject stream (32), ii) adjusting the pH of the first reject stream (32) to >9, iii) passing the first reject stream (32) through a second RO membrane (26) to produce a second permeate stream (36) containing ammonia and a second reject stream (38), and iv) passing at least a portion of the second permeate stream (36) to a cooling tower (12) to evaporate at least a portion of the ammonia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.