Abstract
The use of electromembrane technology for aluminium plant waste water treatment and for a new type of acidic catalyst synthesis has been studied. To recycle the exhaust gas desulphurization solution of an aluminium plant whose main components were Na 2SO 4 and NaF the four-compartment electrodialyzer with one cation exchange and two anion exchange membranes was used. Desalination and recycling of this solution with simultaneous formation of caustic soda and AlF 3 used in the main process is an example of waste water recycling. For tungstic heteropoly acid synthesis from sodium tungstate and phosphate the traditional two-compartment electrodialyzer with a cation exchange membrane was used. Electrochemical 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 waste water formation.
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