What is the 'right' way to dispose of spent ammonium persulfate etchant? I have a septic system, so I really don't think I want to pour it down my drain! Right now, I have a gallon or two in my shop, stored in plastic jugs that originally contained PEG. The nearest 'hazardous waste disposal facility' is about 40 mile away, so trying to avoid that, especially during this global pendemic.
I have done a number of things in the past with my used ammonium persulfate solution, but wondering what options are really acceptable? The easiest for me is to let it evaporate about half way, then pour it in a lined garbage can which has mostly used paper towels, Other things I've thought of are:
1) Using it as weed killer.
2) Pouring it down the floor drain (followed by a good water rinse!) at work where they have municipal sewer.
2) Waiting for it to completely evaporate and throwing the crystals in the garbage.
3) Storing for a year (or more?) in a container with a piece of copper pipe, then pouring the whole thing out in the woods.
4) Calling a local hair salon and asking what they do with the run off solution from perms. I thought I read ammonium persulfate is part of the chemical mix used for that.
Sorry in advance for opening a can of worms by inviting wild conjecture and opinions, but Googling "ammonium persulfate disposal" is pretty much useless.
I have done a number of things in the past with my used ammonium persulfate solution, but wondering what options are really acceptable? The easiest for me is to let it evaporate about half way, then pour it in a lined garbage can which has mostly used paper towels, Other things I've thought of are:
1) Using it as weed killer.
2) Pouring it down the floor drain (followed by a good water rinse!) at work where they have municipal sewer.
2) Waiting for it to completely evaporate and throwing the crystals in the garbage.
3) Storing for a year (or more?) in a container with a piece of copper pipe, then pouring the whole thing out in the woods.
4) Calling a local hair salon and asking what they do with the run off solution from perms. I thought I read ammonium persulfate is part of the chemical mix used for that.
Sorry in advance for opening a can of worms by inviting wild conjecture and opinions, but Googling "ammonium persulfate disposal" is pretty much useless.