Method for removal of coal tar based contaminants from waste waters
US4729832A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Mar 8, 1988 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/909
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention relates to a method for substantially reducing the concentration of coal tar based contaminants in waste water streams. The method comprises first forming an intimate mixture of the waste water stream to be treated with at least one coal tar based extractant. The intimate mixture then is subjected to an extraction temperature sufficient to reduce the concentration of the contaminant in the waste water stream to its equilibrium concentration as the extraction temperature employed. Finally, the mixture is separated and a treated waste water stream recovered which is characterized by a substantially reduced and constant concentration of the contaminants and a substantially reduced biological demand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.