I don't remember a lot about this stuff, but I do seem to recall that silver
is great at killing bacteria - including the good bacteria used to digest
organic wastes. Therefore discharge limits to a POTW will be pretty low
(0.1 ppm?). That's how it was in Connecticut, in the 1980's.
There are little plate-out units that are pretty inexpensive and pull most
of it out of the fixer. Check with your film supplier, I would say.
Patty
----------
From: Ffffffffft
To: TechNet
Subject: Silver Halide Film Development
Date: Tuesday, January 14, 1997 7:44PM
Hello fellow TechNetters:
Recently I had some questions regarding Phototool dimensions. I want to
thank all who responded. Your input was very helpful!
In the development of Silver Halide film, there are byproducts of spent
developer and fixer. How do you handle these? Or, more specifically...
I am told by some people, that depending upon the amount of silver in the
developer, if it is within limits, can be sent down the drain with the rinse
water. A waste treatment lab tech suggested that it could be used to treat
some of the waste they handle to adjust the pH. Has anybody tried re-using
spent developer for anything? Currently, the developer is drained from the
feed-and-bleed system of the Film Processor unit into a barrel, which is
carried to our Waste Treatment department.
In addition, how do you handle the spent fixer solution? It is usually
heavily concentrated with silver. Currently, it is drained from the
feed-and-bleed system of the Processor unit into barrels, which are carried
to Waste Treatment department, who sells the barrels. We have looked into
silver recovery units, but haven't found one we like (got any suggestions?).
I'd like to eliminate the handling chemical waste by our Artwork Generation
technicians. How do most places handle the by-products of Silver Halide
film
development?
Thank you in advance.
Sincerely,
Process Engineer
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