What are some common precipitating agents used to remove metals from aqueous waste streams?

What are some common precipitating agents used to remove metals from aqueous waste  streams?
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1 Answer

Answer :

Perhaps the most common agents used are:
1) Metal hydroxides
2) Lime or caustic soda
3) Metal sulfides
4) Alum or ferric salts
5) Phosphate or carbonate ions
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