Method and apparatus for recovering wash water from pulp and paper mill effluent
US5470481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/28
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus for recovering wash water from effluent generated by a pulp and paper mill. The method includes filtering at least a portion of the effluent to form a filtrate stream and an organic solids feed stream. The organic solids feed stream is exposed to a temperature and a pressure which are supercritical for water to cause a substantial portion of the organic component to oxidize and form a product stream that, when cooled, includes a gaseous component, an inorganic solids component, and a liquid wash water component. The wash water component is separated from the gaseous and inorganic solids components, thereby recovering wash water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.