METHOD FOR REMOVING HEAVY METALS FROM LIQUID EFFLUENTS

摘要

A method for removing heavy metals from liquid effluents, particularly water used for scrubbing industrial waste or household refuse incinerator fumes, wherein the liquid effluent containing the heavy metals to be removed is pre-neutralised, particularly using soda, to raise the pH of the liquid effluent to around 1-4 and thereby precipitate out the metal hydroxides; the resulting pre-neutralised liquid effluent is contacted with a metered amount of a final neutralisation additive to adjust the pH of the effluent to around 9, wherein said additive binds the heavy metals; the heavy metals are separated; and the concentrated solid thus separated is filtered to give a liquid material and a heavy metal-containing solid material that may then be vitrified.