METHOD FOR REMOVING HEAVY METAL AND SULFATE IONS FROM HIGHLY CONCENTRATED, HEAVY METAL-CONTAINING AND STRONGLY ACIDIC SOLUTIONS

摘要

The invention relates to a method for removing heavy metal ions from highly concentrated, heavy metal-containing, strongly acidic solutions containing a percentage of sulfate, comprising a bioreactor having sulfate-reducing bacteria, wherein the sulfides produced in the bioreactor from the sulfate-containing solution are fed to a mixing container (MB1), wherein hydrogen sulfide (H2S) present in the mixing container (MB1) is fed by way of a carrier gas to a second mixing container (MB2) to which untreated waste water is fed, wherein a separator (FR4) for the precipitation of metal sulfides is connected downstream of the second mixing container (MB2), wherein substantially pure sulfuric acid (H2SO4) is withdrawn from the precipitation reactor (FR4).