Method for treating photographic processing fluids prior to sewering thereof
US4128424A · kind A · utility
4Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1977 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Sep 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S210/919
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a method for separately treating the used developing fluid from the remaining used photographic processing fluids prior to feeding the used fluids to a sewer system. The used developing fluid is continually withdrawn from the developing tank and chemically neutralized in a collecting vessel by a chemical oxidizing agent such as acetic acid or hydrogen peroxide prior to feeding the fluid to a sewer system. The method includes the continued withdrawal of spent fixer fluid to a silver recovery device and recirculation of the regenerated fixer fluid to the fixer tank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.