Wastewater treatment
US4569769A · kind A · utility
17Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1984 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Jun 25, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/725
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Aqueous alkaline sulfidic waste effluents are often subjected to air oxidation processes that for economic sizing oxidize the sulfides only to thiosulfates. Thiosulfates are still immediate oxygen demanders and thus their concentration in the effluent must normally be reduced to below a threshold level before the effluent can be discharged. The effectiveness of hydrogen peroxide for this purpose can be significantly improved both as to rate of reaction and extent of removal by employing a copper catalyst in solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.