The invention belongs to the technical field of industrial
sewage treatment and relates to a method for treating high-
sulfide high-
salinity high-COD (
Chemical Oxygen Demand) waste water. The method comprises two steps namely a
chlorine oxidation stage and a
hydrogen chloride gas
desalination stage and specifically comprises the following steps: introducing a certain amount of
chlorine to the waste water, wherein organic substances contained in the waste water are decomposed and removed due to the oxidizing action of the
chlorine, sulfides are oxidized to be separated out in a form of elemental
sulfur; carrying out
solid-liquid separation, and then recovering elemental
sulfur; introducing a certain amount of
hydrogen chloride gases to waste liquor subjected to the
solid-liquid separation in the chlorine oxidation stage, wherein clear and transparent
hydrochloric acid is retained because chlorine salt contained in the waste water with common-
ion effect is gradually separated out; and carrying out
solid-liquid separation, and then recovering the chlorine salt and the
hydrochloric acid. The process disclosed by the invention can be carried out under
constant pressure, not only can efficiently remove the sulfides, the organic substances and the inorganic salt out of
industrial waste water, but also can recover the elemental
sulfur, the chlorine salt and the
hydrochloric acid through separation, thereby realizing the zero
discharge of the waste water.