In practice water authorities normally have no interest in the very small quantities of chemicals from a home darkroom.
Ian
i wouldn't say that to someone working for one of the local government agencies. there are stiff fines for people who dump chemicals, and
i know someone who was fined a hefty sum.
Ed has posted the US policy on fixer disposal
It's my understanding that there is no "US policy on fixer disposal;" this is a matter for local municipalities to decide.
Silver levels in fixer can go as high as 15gms per litre, but thats from x-ray processors, more typical would be 5gms per litre - 5000ppm
Typically silver recovery machines plating silver out of fixer reduce the level to 3-5ppm the fixer is then passed through a wire wool filled cartridge which reduces the level to 1ppm, which is the most typical permitted discharge level, dilution with wash water would reduce the level to .05 ppm
Silver recovery is a profitable business and it makes sense to recover it efficiently.
Ian
I guess I will take mine to my Professional Lab when I pick up or drop color work. Still it seems that with 70 billion gallons of water treated, and I think our wast water is used to cool the Necular Power Plant at Palo Verde rather than send down a river to the ocean that the few gallons I use a year is not a majior contibuteor to heavy metal pollultion
I have just finished building my first darkroom and am about to put it to use.
Before doing so, I would like to have a strategy for properly disposing of my fixer.
Does anybody know of any outfits near the Boston, MA area that will accept moderate amounts of used darkroom fixer (say, a few liters per month) and dispose of it properly?
Thanks
If I recall from reading
Three years ago I was visited by Toronto Chemical Management officers. They showed up unannounced with their testing devices and demanded to sample the waste BEHIND the flow of the Silver Recovery at the point where the hoses entered the floor drain leaving our building.
I was very proud of the fact that Elevator passed the examination with flying colours.
I urge all home darkroom users where ever you are located , to consider the risks associated with dumping spent fix. You local plumber has absolutely no idea the implications
A quick search reveals the official Mass DEP position.
One suggestion. "Some local photo processing businesses may accept silver bearing fixer waste for recycling and Management."
The full recommendations are here Mass DEP
Ian
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