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What's the safe way to dispose of used copper etchant?

Discussion in 'Hobby Electronics' started by Andy, Nov 3, 2005.

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  1. Andy

    Andy Guest

    I've been using Ammonium Persulphate, the instructions just say to "Follow
    your local authorities recomendations on disposal.".

    Who is the local authority in Aus?

    Just how toxic is the stuff - I'm thinking I'll just dig a hole out the back
    and pour it in.
  2. Your local government (council) should be able to advise you on this.
    Alternatively and probably better - consult your old high school chemistry
    books and see if there is something you can mix with it to turn it into
    something useful like Ammonium Sulphate which can be used as a fertiliser on
    your plants. Any precipitated copper can then also be used as a trace
    element. :)

  3. That would probably be your state EPA department.
    That's what I do for the small quantity I use. Although it would be
    best to save it up and dispose of it at your local council chemical
    cleanup day (if you have one). We had ours the other week and it was so
    popular that there was an hour long wait to get in!

    After using ferric chloride as a kid and hearing talk about not pouring
    it down the sink, it was interesting to find out that Sydney Water
    actually add it to our drinking water! Not that I drink tap water
    anyway :->

    Dave :)
  4. swanny

    swanny Guest

    You could always evaporate it, and end up with crystals mostly of copper
    sulphate and a bit of ammonium sulphate (if you've used the etchant a
    lot). I have a few jars of big blue copper sulphate crystals as a result.
  5. (Just) Allan

    (Just) Allan Guest

    Or just add it to your drinking water - our government encourages
    industry to use our kidneys to filter their waste flouride like this
    every day.
  6. Roy

    Roy Guest

    This stuff is excellent for discouraging termites. Mix copper sulphate with an equal
    quantity of calcium carbonate (crushed limestone) and mix with water (100g per litre),
    pour it in small quantities (100ml per tree) round the base of your favourite trees and
    termites will not trouble for at least a couple of years.
  7. JD

    JD Guest

    Contact your local Council or EPA.


  8. Rob

    Rob Guest

    About 5 yrs ago I contacted WA Water Authority asking about disposal, the
    answer: Tip it down the sink with a heap of water behind it.

    Sometimes we tipped it down the drain, some times it went out with lab waste
    (at a cost of ~ $1/L).

    We would have been generating 20 --> 30 L of spent solution per year.

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