Carbon dioxide enhanced complex-adsorption process for metal or metalloid removal from water
US6787041B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2002 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Dec 4, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/06
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of removing metal or metalloids, arsenic in particular, from groundwater or another source of contaminated water. The method comprises providing a water source, contacting the water source with CO2, whereby the pH of the water source is lowered to produce pretreated water, contacting the pretreated water with a metal or metalloid complex-adsorbing substance whereby contaminants are separated from the remainder of the pretreated water to produce metal or metalloid-depleted water, and stripping the CO2 from the metal or metalloid-depleted water, whereby the pH of metal or metalloid-depleted water is increased. A system for metal removal utilizing the CO2 process is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.