The process of purification and disinfection of yeast production sewage under the action of electrodialysis has been studied. As a result of research to determine the physicochemical and microbiological sewage composition, it was found that in sewage of the 1st degree of yeast separation has the highest excess content of organic and mineral substances in terms of: Chemical oxygen consumption (COC) - 31096/500 mg О2 / dm3, suspended solids - 6800 / 300 mg / dm3, chlorides - 2147/350 mg / dm3and

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... ulfates - 6089/400 mg / dm3. The content of organic substances, which is characterized by the Chemical oxygen consumption (COC) indicator, in sewage of general discharge, 2nd and 3rd degree of yeast separation is 41%, 50% and 74% and that is lower than in sewage of the 1st degree of yeast separation. The number of microorganisms in terms of Total microbial count (TMC) in sewage of the 1st stage of yeast separation is the largest and is 12·107 colony-forming units CFU / cm3. It is determined that the process of sewage treatment and disinfection from minerals occurs more efficiently in the cathode zone, and from organic substances and microorganisms - in the anode zone of the electrodializer at a water temperature of 293 K, current of 0.1 A and duration of exposure 20 min.