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 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************