Silver recovery system data Page: 4 of 25
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cartridge tailing units on hand dissolved silver was also greater than 5ppm.
Due to packaging requirements the SRS Photo Lab generated at least three
55 gal. drums of hazardous waste per year.
The best possible silver recovery system would be self contained and
simple to operate. It should take very little time to monitor and maintain.
It should also recover silver in a form that is not considered hazardous
waste. With these features in mind the Quality Control Photographer began
to search the photographic market for the "perfect" solution to his problem.
Discussion
The system that was determined to be the best for SRS Photography is
manufactured by Silver Solutions ® in Yazoo City, Mississippi. This system
uses the same proven technology that iron based chemical recovery
cartridges do. When silver laden photographic fixers come in contact with
iron an ion exchange takes place. The silver is removed from the fixer and
replaced with dissolved iron.
The beauty of the Silver Sure® Cartridge is it's design. The cartridge is
made of large PVC plastic pipe with caps on each end. It holds a
replaceable core made by spraying iron powder into a sheet of fiberglass
and then rolling it up. Photographic fixer flows through the cartridge from
the bottom to the top and overflows to a drain. As the ion exchange takes
place the silver is embedded in the fiberglass core as the dissolved iron
goes out the drain.
To help determine the effectiveness of the recovery system that was in
place before the change to the Silver Sure ® system the fixers involved in
the study were analyzed for silver content. The results of the analysis
showed concentrations from 1,916 ppm to 4,484 ppm silver.
To determine the effectiveness of the electrolytic silver recovery
system samples were collected at the discharge point of each recovery unit.
The silver concentration of these samples ranged from less than 3ppm to
590 ppm.
The most efficient electrolytic set ups were the ones that were "tailed"
by steel wool chemical recovery cartridges. The steel wool cartridges
obviously were catching the silver that the electrolytic units missed. The
least efficient setups were the electrolytic units that were not compatible
with steel wool cartridge "tailing". "Tailing" was not used because those
electrolytic units used pumps to discharge the chemicals to the drain. The
high rate of discharge would.not allow enough time in the steel wool
cartridges for silver to be removed from the-solution.
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Boulineau, B. Silver recovery system data, report, August 26, 1991; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1069263/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.