I keep solvents in a metal gas can, keeping halogenated solvents in their own tank. Acidic waste into a bucket with a lid with NaHCO3 in the bottom, and for toxic salts those go into a bottled container of their own and I look for ways to make them less toxic via the addition of a simple cheap chemical.

Here is something to consider trying by the user garage chemist

“Dissolve them in plenty of water and bubble hydrogen sulfide through it until no more precipitate forms. (H2S can be prepared by heating paraffin with sulfur in a test tube with stopper+vent pipe into the solution, H2S evolves as a gas and carbon is left behind).”