Method of improving city water
US5391302A · kind A · utility
4Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2303/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The Langelier index and pH of city drinking water are improved by mixing and reacting a slurry of calcium carbonate and slaked lime covered with calcium carbonate produced in a slaked lime dissolving vessel with carbonic acid-containing water in a mixing and reacting vessel to make a calcium hydrogen carbonate aqueous solution which in turn is continuously added to water in a water-receiving vessel together with the aqueous solution of slaked lime. As a result, unused undissolved matter is decreased, and the Langelier index of drinking water can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.