Having been in the graphic arts and one hour photo business
I would suggest you check with your silver film manufacturer,
(Kodak, Agfa, ) and inquire about silver recovery equipment
as well as the PPM requirements in your local area for
dumping developer and fixer containing silver.
In California it is not legal and would result in fines.
Bob
>>> "Goldman, Patricia J." <[log in to unmask]> 01/15/97
01:05pm >>>
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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