Hot lime precipitation of arsenic from wastewater or groundwater
US5378366A · kind A · utility
21Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Apr 22, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/911
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process is disclosed wherein arsenic dissolved in wastewater or groundwater is removed from solution by precipitation thereof as calcium arsenate formed by the reaction of the arsenic with lime or hydrated lime in a heated solution at a pH of about 11 to about 13. It is preferred that the arsenic is first converted by oxidation to its pentavalent form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.