Water treatment for sulfate ion removal
US5035807A · kind A · utility
15Cited by
9References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Mar 14, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/916
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention provides a chemical process for the treatment of water containing dissolved calcium and sulphate ions, so as to produce a purified product water having a reduced sulphate ion concentration. Barium sulphide is added to the water to cause precipitation of barium sulphate from the water. The water from which the barium sulphate has been precipitated is then treated with carbon dioxide to form hydrogen sulphide in the water, and the hydrogen sulphide is stripped from the water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.