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The use of industrial waste as the secondary raw materials is relevant all over the world. The rice sediment is a byproduct of the rice soft beverage industry. The rice mash was obtained by the rice sediment fermentation with α-amylase and ethanol yeast  Saccharomyces cerevisiae . The rice wort fermentation efficiency was estimated by rice mash ethanol concentration, the visible mass concentration of mash dry substances, mash acidity, total yeast number and yeast budding, yeast cell area. The most intensive fermentation was in the sample with α-amylase. On the 7th day of fermentation, the alcohol concentration in this sample was 5.28volume (%), which is 5 times more than in the sample without α-amylase. Digital morphometric characteristics of yeast correlated with actual fermentation parameters, reflecting yeast adaptive reactions at various ethanol technological stages. The rice mash can be used in the rectification process to obtain new products - ethanol distillate or bioethanol. New methods and expanding technologies for biotechnological rice sediment recycling are required in this field of research.

Biotechnological recycling of byproducts in the rice soft beverage industry: a preliminary research