Method and apparatus for the purification of water contaminated with sulfate ions and with heavy metal ions
US8968572B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2008 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Dec 2, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A20/152
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a device and a process for purifying water which is contaminated with sulphate ions and heavy metal ions, the water is collected in a water reservoir and a substance having basic activity in water is fed to the water reservoir in such a manner that a precipitant having heavy metal ions is precipitated from the water, wherein at least a subquantity of water is taken off from the water reservoir and is separated into pure water which is substantially freed from sulphate ions and heavy metal ions and dirty water which is enriched with sulphate ions and heavy metal ions. The dirty water is at least in part recirculated to the water reservoir, as a result of which a concentration of sulphate ions in the water reservoir is achieved such that a precipitant having sulphate ions is precipitated from the water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.