Re: Developing Chemical Disposal

[P. J. Alling]

On 3/8/2010 12:54 PM, William Robb wrote:

----- Original Message ----- From: "P. J. Alling"
Subject: Re: Developing Chemical Disposal



Silver Nitrate is a antiseptic, a bactericide.  You don't want it in 
a septic system as it will have that effect on the flora that breaks 
down waste.  There's a lot of silver in the fixer when it's 
exhausted, something like 90% of the amount originally present, you 
can recover that.or you can build your own which considering the 
price of silver might be worth while.  You might want to look into 
one of these.

http://www.porters.com/catalogsearch/result/?q=Silver+Magnet

I believe that the dissolved silver in fixer is part of a sulpher 
compund (silver sulphite).
I could be wrong though.
Did the OP ever say if he was using a septic field or just a tank that 
was pumped out periodically?

William Robb

I haven't looked at the chemestry in a long time.  A little silver 
nitrate can kill a lot of bacteria though.  Recovering the silver before 
discarding the solutions just strikes me as good economics, if you're 
processing enough film.  It's up to you to decide what's enough.  I'll 
bet the break even point on silver recovery is sooner than the break 
even point on installing solar power panels, and I know people who have 
done that recently.

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