Sodium Persulfate Disposal

[comfortably_numb]

Well...  What about it?

I searched but found nothing but Ferric Chloride disposal.  How do you all do this?  I want to be environmentally sensitive, and obviously not screw up my water pipes. 

Thanks,
Joey

[MarcoMike]

sink!

spent persulfate is likely to contain:
some persulfate left
plenty of sulfate ions
plenty of cupric ions
(I know, the charge and mass balance is not ok... let's don't think about it...)

these are all quite safe to the environment in home-etching scale. just let some water flow and it's ok!
by the way, also ferric/ferrous chlorides are safe... Copper is probably the most "dangerous" specie involved, as it has a role in the metabolism of plants, bacteria and stuff... but as said, 50 grams of cupric chloride are not a threat to the environment!

[gutsofgold]

FeCl3 might not be an immediate threat to the environment but I'd imagine it would be a major one to your household pipes.

[comfortably_numb]

Really could use a definitive answer on this, as I have a container of it sitting on my counter still!

[calpolyengineer]

Assuming that it isn't detrimental to the environment, I'd say your best bet to save the pipes is to just dilute it a lot before pouring it down the drain. If you have a decent sized bucket, just put a bit of sodium persulfate and fill the rest with water. Repeat as needed.

-Joe

Edit: Doesn't really change the jist of my post but I thought you were trying to get rid of ferric chloride.