I've noted several posts about handling silver bearing wastes & wastewater 
and I have some comments as an industrial waste inspector that may (or may 
not) be useful:

The EPA considers wastewater from film developing to be a Printed Circuit 
Board Manufacturing process water just like the water from plating, etching, 
etc. is.  This means that you don't have to meet the federal silver limit 
until the wastewater is mixed together & being discharged, the significance 
of the legal *dilution* with non-silver bearing wastewater obviously 
depending on the volume of your other rinses.  Obviously if your 
film/artwork site is in a separate facility or you drain wastewater from 
there separately from your plating area this doesn't apply.

I'm not putting down waste minimization, far from it.  There are many cost & 
regulatory benefits to waste minimization in addition to my narrow focus of 
pollutants to the sewer.   I put in my two cents worth since previous posts 
seemed unclear on where federal silver limits would be applied, which may 
affect the business decision of what to spend on silver treatment.

Pascal Roubineau

(The opinions stated here are mine and not necessarily the same as my 
employer)

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