Carbon pre-treatment for the stabilization of pH in water treatment
US7628923B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | May 29, 2007 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | May 29, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2209/06
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Treatment of un-wetted or low moisture activated carbon with a suitable quantity of carbon dioxide provides a material which, on contact with water, controls pH in treatment water. Use of this treated activated carbon in a water treatment system provides water having an essentially neutral pH which is immediately potable thereby eliminating the necessity to drain and dispose of any soak water. The contact pH of the treated carbon remains within the potable pH range for treatment of more than 100 bed volumes. Additionally, the modified carbon may minimize metal leaching from contaminants in the water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.