Circulation production process for alcohol with potatoes as main materials

Abstract

The invention relates a annuliform production technique for producing alcohol with potato materials by utilizing anaerobic digesting solution as the technology ingredient water. The invention comprises the steps of: crushing potato starchiness materials, adding digesting solution, alpha- amylase, stirring uniformly, heating, incubating, liquefying, cooling, adding diastase, cooling after saccharification, inoculating yeast, culturing at constant temperature, distilling to obtain the product of alcohol, cooling the distilled waste mash, anaerobic-fermenting to obtain biogas, separating the broth to obtain digest and active sludge, and recycling the digest into the next fermentation to form a ring cycle. The distilled waste mash only needs anaerobic fermentation, which reduces the occupied ground area greatly and fixed asset investment. anaerobic fermentation is low cost, recycle of the digest can realize zero release of fermentation wastewater, completely eliminate the environmental pollution caused by the high concentration wastewater released by the present production of alcohol, and save large amount of water.

Description

Technical field [0001] The invention relates to a circular production process for the production of potato raw alcohol using anaerobic digestion liquid as process ingredient water, and belongs to the technical field of fermented alcohol industry. Background technique [0002] Fermentation of starchy raw materials to produce alcohol is one of the main methods of alcohol production. In the traditional fermentation process of starchy raw materials to produce alcohol, the starchy raw materials are crushed, slurried with water, cooked and liquefied, and lightly saccharified, and then inoculated with alcohol yeast fermentation (as introduced in the book "Alcohol Industry Handbook", edited by Zhang Kechang, etc., Light Industry Press). The traditional fermentation production process averages 12-15 tons of waste mash and COD per ton of alcohol. cr As much as 40,000 to 50,000 mg / L or more, it not only causes serious water pollution, but also causes a lot of waste of resources. [0003] Th...

AI Technical Summary

Problems solved by technology

The main problems of the method of producing biogas by anaerobic fermentation first and then aeration and aerobic treatment are that it occupies a large area and requires high investment. The third is that the treatment of wastewater is difficult to complete, and the discharged wastewater COD cr Still around 500mg / L

There is also a process of using distillation waste liquid circulation batching, but because the distillation waste mash after alcohol fermentation contains a large amount of organic acids, and the pH value is between 3.0 and 3.5, the liquefaction enzyme cannot normally exert its activity when the starchy raw material is liquefied after the batching ( The optimal pH value of liquefaction enzyme is between 6.0 and 6.5), which leads to the partial circulation of distillation waste liquid, and the circulation batch is limited, and there is still a large amount of high-concentration wastewater discharged. This method has not been used in industrial production scale.

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