Evaluation of efficiency of electrochemical treatment of regeneration solutions containing ions of heavy metals

Abstract

An increase in the anthropogenic load on the environment, in particular, the pollution of water bodies by sewage containing heavy metal ions, leads to an active search for sewage treatment from hazardous carcinogens and toxicants. The use of ion exchange in the process of water purification is relevant. The processes of regeneration solutions processing are important for the creation of closed cycles of water use. The results of studies on the electrochemical processing of acidic regeneration solutions containing zinc and nickel ions are presented. It was shown that the use of a two-chamber electrolyzer effectively removed zinc and nickel ions from sulfuric acid regeneration solutions and concentrated sulfuric acid in the anode chamber. The dependence of the current output of heavy metals on the concentration of sulfuric acid in the cathode space and on the time of electrolysis was studied. It is established that the maximum output of nickel and zinc by current is achieved by decreasing the acidity in the cathode space to values ~ 50 mg-ekv / dm3. It is shown that the yield of nickel and zinc by current does not depend very much on the initial concentration of sulfuric acid in the initial solution. The results on the concentration of sulfuric acid are presented, depending on the time of electrolysis, the initial concentration of acid and heavy metals in the cathode space.