Method and apparatus to detoxify aqueous based hazardous waste
US5087370A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Dec 7, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process and apparatus is provided in which aqueous based wastes are processed to remove solids, decant phase separated product, optimize chemically for solvent specific extraction, remove toxic metals and organics via solvent extraction and remove residual metals and organics via flocculation/filtration and adsorption with activated carbon. The system employs chemical optimization of the aqueous waste stream by the addition of reagents to optimize subsequent treatment and the addition of chelating agents which inhibit the precipitation of heavy metals so that they are maintained in the waste stream as an organometallic complex which can be extracted via carbon dioxide extraction and concentrated for recovery, recycling or final disposal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.