Apparently dry waste management system
US6736977B1 · kind B1 · utility
43Cited by
11References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2000 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Apr 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/912
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of disposing of photographic silver halide processing solutions including developer, bleach and at least one silver bearing solution comprising a) combining the developer and bleach solutions to oxidize the developing agent in the developer and form a developer/bleach waste solution, b) treating the silver bearing solution(s) to reduce the silver ion level and form a low silver waste solution; and c) contacting the developer/bleach waste solution and the low silver waste solution with an absorbent material to form an apparently dry waste material having a leachable silver ion level below 5 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.