Ferric Chloride Anhydrous Disposal (iron III chloride)

How do I dispose of Ferric Chloride Solution?
Ans. There are two ways:

1. Contact your local Hazardous Waste Disposal Company for the disposal of ferric chloride. 
2. 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. 
3. This information is taken from some other source.