Method of removing calcium from water containing calcium hydrogen carbonate in high concentration
US6905606B1 · kind B1 · utility
6Cited by
6References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/915
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for removing calcium from water containing a high concentration of calcium bicarbonate, permitting a reduction of the calcium bicarbonate equivalent to 200-500 ppm calcium to the level in accordance with the water quality standards for industrial use, not by a method using a large amount of heat and power as heating and deairing, but by a simple chemical treatment. Calcium hydroxide is added to waste water containing a high concentration of calcium in a form of calcium bicarbonate for making them react with each other, and removing calcium by fixing it to calcium bicarbonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.