USE OF ELECTROMEMBRANE TECHNOLOGY FOR WASTE-WATER TREATMENT AND MODERN ACIDIC CATALYST SYNTHESIS

The use of electromembrane technology for aluminium plant waste water treatment and for a new type of acidic catalyst synthesis has been stu died. To recycle the exhaust gas desulphurization solution of an alumi nium plant whose main components were Na2SO4 and NaF the four-compartm ent electrodialyzer with one cation exchange and two anion exchange me mbranes was used. Desalination and recycling of this solution with sim ultaneous formation of caustic soda and AlF3 used in the main process is an example of waste water recycling. For tungstic heteropoly acid s ynthesis from sodium tungstate and phosphate the traditional two-compa rtment electrodialyzer with a cation exchange membrane was used. Elect rochemical acidification of substrates in the anode compartment of the electrodialyzer with simultaneous removal of sodium ions through the membrane permits a quantitative yield of the product and excludes wast e water formation.