Method for fermenting alcohol by reusing alcohol grain liquid and medium-temperature anaerobic effluent

Abstract

The invention discloses a method for fermenting alcohol by reusing alcohol grain liquid and medium-temperature anaerobic effluent. According to the process method, burdening liquid is added according to the feed liquid weight ratio of 1:1.5-2.4, the burdening liquid is composed of the alcohol grain liquid, the medium-temperature anaerobic effluent and supplemented clean water, the effluent is reused, and ammonium hydroxide or sulfuric acid are not required, so that the effluent treatment cost can be reduced. By controlling the feed water ratio and adjusting the proportion of alcohol grain liquid and the medium-temperature anaerobic effluent to control the pH value, the complex cost-increasing procedures of conducting acid radical removing, ammonia nitrogen removing and additionally adding of acid or alkali to adjust the pH value and the like on the medium-temperature anaerobic effluent in the traditional process are avoided, the production efficiency is greatly improved, the production cost is reduced, sewage discharge in alcohol production is greatly reduced, feed mixing water use cost and sewage treatment cost are saved, more additional products are produced, and considerable market economical benefit is brought.

Description

technical field [0001] The invention relates to the technical field of reuse of distiller's grain liquid water and medium-temperature anaerobic effluent in the field of bioengineering, in particular to a method for co-reusing fermented alcohol with distiller's grain liquid water and medium-temperature anaerobic effluent. Background technique [0002] Alcohol, as a renewable strategic resource, has entered the national key industrial products, but the alcohol fermentation industry is currently an industry that pollutes the environment. Most of the wastewater produced by traditional fermentation methods is treated and discharged into natural water bodies. Although many indicators such as COD in the treated discharged water have reached the standard, there is still a large gap compared with natural water. The alcohol fermentation industry is a bulk product production industry, and the discharge water measurement unit is usually 10,000 tons, which still has a large pollution to ...

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Problems solved by technology

[0003] The invention patent with the application number 200410066017.3 published on August 31, 2005 in the Chinese patent discloses a closed-loop process for the production of high-concentration alcohol by clear liquid fermentation. The pH value of the slurry is low due to reuse, which needs to be adjusted by adding ammonia water, which greatly increases the production cost

The Chinese Patent Application No. 201010576401.3 published on July 13, 2011 discloses a method for the production of ethanol from medium-temperature anaerobic effluent water resources. The disadvantage of this technology is that it requires a large amount of oxidants such as oxygen or air. Oxidation treatment is time-consuming, labor-intensive and costly. At the same time, a large amount of CO will be produced through this technology. 2 , discharged into the air, aggravating the greenhouse effect and causing a great impact on the environment and climate

[0004] Chinese patent published on July 6, 2011 with the application number of 201010576411.7 disclosed in a patent for invention discloses a method for improving the production of alcohol using medium-temperature anaerobic effluent as batching water. After mixing the anaerobic effluent, adjust the pH, add liquefying enzyme to heat and cook for liquefaction, add saccharifying enzyme to saccharify after cooling, inoculate and ferment after cooling down, distill after fermentation, and perform anaerobic treatment on the distillation waste liquid obtained from distillation , the precipitation of sulfate radicals is required. After the distillation waste liquid is anaerobically treated, the pH value of the medium-temperature anaerobic effluent is about 8.0. When it is used as mixing water, it is necessary to add sulfuric acid to reduce the pH value. In addition, deamination treatment is required to As the ingredient water for the next batch of alcohol fermentation, on the one hand, the treatment of sulfate radicals greatly increases the production cost; on the other hand, the existence of sulfate radicals will cause corrosion to the equipment, seriously affecting the service life of the equipment, and even causing damage to the equipment

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