Combined process for purification of galvanic waste waters with reutilization of metals

摘要

The invention relates to the combined processes for purification of sewage waters, particularly of galvanic waste waters. The process, according to the invention, includes treatment of waters with hydrogen peroxide solution with a concentration of 10...20 mg/L, irradiation with ultra-violet radiation with an intensity of 15...20 J/cm2Àmin, alkanization of waters up to a pH of precipitation of the insoluble hydroxides of heavy metals in the cathodic chamber of an electrolyzer at a current density of 1...2 A/dm2, with the concomitant acidulation of an electrolyte of auxiliary salts in the anodic chamber, combination of electroflotation with filtration of the precipitate, dissolution thereof in anolyte and reutilization of the obtained solution in the galvanic processes.