Here's what MG Chemicals says:

The solution must not be put down the drain because of residual copper ions
left in it. To make it safe for disposal, you can add sodium carbonate
(washing soda) or sodium hydroxide to it to neutralize it, until the pH
value goes up to between 7.0 and 8.0, testing it with indicator paper.
Copper will be deposited as a sludge. Allow the sludge to settle, pour off
the liquid, further dilute it with water and then it can be poured down the
drain. Collect the sludge in plastic bags and dispose of it as required by
your local waste authority.



>From: Tal <kooter@012.NET.IL>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE]: Ferric Chloride
>Date: Thu, 10 Jul 2003 08:50:50 +0300
>
>Joel
>
>It's a big problem for me also.
>Any ideas?
>
>Tal
>
>-----Original Message-----
>From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
>Behalf Of Joel Middleton
>Sent: Thursday, July 10, 2003 6:58 AM
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [EE]: Ferric Chloride
>
>
>What is the best way to dispose of used ferric
>chloride after I am done etching some boards?
>
>Thanks
>
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