Zero-waste method for producing ethanol and apparatus for implementing same

A wasteless method for producing ethanol comprises grain milling, mixing same with water in mashing, heat-treating mixed mass accompanied by two-stage enzymatic hydrolysis, sterilizing hydrolyzed mass, cooling same, performing enzymatic vacuum saccharification of hydrolyzed mass, cooling resulting wort down to fermentation temperature, separating wort into first liquid and first solid phases, additionally separating first solid phase into second solid and second liquid phases, fermenting liquid phases, and distilling ethanol from fermented wort. Second solid phase is dried and used for feed and food production, still bottom from distilling is returned to mashing and also used for irrigation. A plant for implementing the method comprises receiving hopper, grain separator, hammer mill, vibrating screen, mixer, first and second stage mechanic and enzymatic treatment unit for carbohydrate hydrolysis, sterilizer, vacuum saccharifier, at least one pre-thickener including hydrocyclone or decanter centrifuge, additional separator, drying apparatus, and ultrafiltration unit connected to rectification unit distilling ethanol.