Method for producing ethanol by recycling anaerobic digestion effluent and vinasse clear liquid

A technology of anaerobic digestion and distiller's grains, applied in biofuel, fermentation and other directions, can solve the problems of poisoning ethanol fermentation yeast, reducing the utilization rate of raw materials, increasing operation and cost, etc., to improve process hygiene, avoid the problem of acid production in ethanol fermentation, The effect of improving the utilization rate of raw materials

Active Publication Date: 2018-11-20
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to reduce the discharge of wastewater and reduce the cost of wastewater treatment, part of the distiller's grains will be directly reused in the ethanol batching process during production, but studies have shown that the reuse ratio of the distiller's grains generally does not exceed 30%, otherwise the solids in the distiller's grains, Substances such as acetic acid, lactic acid and sodium salts will accumulate and poison the ethanol fermentation yeast, resulting in low raw material utilization
There are still two disadvantages in directly reusing distiller's grains as ingredients: one is that the distiller's grains contains miscellaneous bacteria, and the reuse of ingredients can easi

Method used

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  • Method for producing ethanol by recycling anaerobic digestion effluent and vinasse clear liquid
  • Method for producing ethanol by recycling anaerobic digestion effluent and vinasse clear liquid
  • Method for producing ethanol by recycling anaerobic digestion effluent and vinasse clear liquid

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[0074] Example 1

[0075] The method for producing ethanol by reusing anaerobic digestion effluent and distiller's grain clear liquid of the present invention adopts the following process steps:

[0076] Mix the membrane filtrate and the distiller’s vinasse in a ratio of 70:40, and the volatile acid concentration is 600mg / L; take 100Kg of crushed corn flour and add 300L of mixed solution as ingredients, and add high-temperature resistant α-amylase (10U / g starch), After stirring evenly, heat to 86°C and maintain for 200min; lower the temperature to 60°C, add glucoamylase (180U / g starch), stir well and keep saccharification for 30min. After saccharification, the temperature is lowered to 30°C, and 15% (v / v) yeast seed liquid is inserted to start fermentation. After the fermentation, ethanol and distillation waste liquid are obtained by distillation. Distillation waste liquid is filtered with 60 mesh filter cloth to obtain wet vinasse and vinasse clear liquid. Some vinasse clear liq...

Example Embodiment

[0078] Example 2

[0079] The method for producing ethanol by reusing anaerobic digestion effluent and distiller's grain clear liquid of the present invention adopts the following process steps:

[0080] The membrane filtrate and the vinasse clear liquid were mixed according to the ratio of 80:20, and the volatile acid concentration was 300mg / L; 100Kg of crushed brown rice powder was added to 260L of mixed solution ingredients, and high temperature resistant α-amylase (10U / g starch) was added. After stirring evenly, heat to 90°C and maintain for 150min; lower the temperature to 60°C, add glucoamylase (150U / g starch), stir well and keep saccharification for 30min. After saccharification, the temperature is lowered to 30°C, and 10% (v / v) yeast seed liquid is inserted to start fermentation. After the fermentation, ethanol, distillation waste liquid and refined tower residue are obtained by distillation. Distillation waste liquid is filtered with 60 mesh filter cloth to obtain wet vi...

Example Embodiment

[0082] Example 3

[0083] The method for producing ethanol by reusing anaerobic digestion effluent and distiller's grain clear liquid of the present invention adopts the following process steps:

[0084] Mix the membrane filtrate and the refined tower residue in a ratio of 90:10, the volatile acid concentration is 100mg / L; take 1000Kg of crushed brown rice powder and add 2600L of mixed solution ingredients, and add high temperature resistant α-amylase (8U / g starch) After stirring, heat to 95°C and maintain for 100min; reduce the temperature to 60°C, add glucoamylase (180U / g starch), stir well and keep for 15min for saccharification. After saccharification, the temperature is lowered to 30°C, and 12% (v / v) yeast seed liquid is inserted to start fermentation. After the fermentation, ethanol, distillation waste liquid and refined tower residue are obtained by distillation. Distillation waste liquid is filtered with 60 mesh filter cloth to obtain wet vinasse and vinasse clear liquid....

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Abstract

The invention discloses a method for producing ethanol by recycling anaerobic digestion effluent and vinasse clear liquid and belongs to the technical fields of waste water treatment and ethanol fermentation industry. The method comprises the following steps: mixing and blending membrane filtrate obtained after membrane filtration of anaerobic digestion effluent, part of vinasse clear liquid, other material mixing water and crushed cereal raw materials, and performing processes of liquefying, saccharifying, fermenting and distilling to obtain ethanol, wherein the membrane filtrate accounts for30 to 90 percent of the total weight of the blending water, the vinasse clear liquid accounts for 10 to 40 percent of the total weight of the blending water, and the rest is other material mixing water; and the concentration of volatile acid of the blending water is controlled to be 100 to 1200 mg/L (based on acetic acid) by adjusting the proportion of the membrane filtrate, the vinasse clear liquid and other material mixing water or adding the acetic acid. By the method, discharge of ethanol production waste water is greatly reduced and water resources are saved; meanwhile, the problem thatthe ethanol is fermented to generate acid is effectively avoided, the alcohol yield is significantly increased, the utilization rate of the raw materials is increased by 1 to 5 percent, and the production energy consumption and cost of the ethanol are reduced.

Description

technical field [0001] The invention relates to a method for producing ethanol by reusing anaerobic digestion effluent and distiller's grain clear liquid, and belongs to the technical field of wastewater treatment and ethanol fermentation industry. Background technique [0002] Ethanol is an important industrial raw material, which is widely used in food, medicine, chemical industry and other industrial fields. It is also an important renewable biomass energy (fuel ethanol), which is highly valued by governments all over the world. [0003] Ethanol is one of the most important bulk fermentation products in my country's fermentation industry. In 2017, there were 131 ethanol production enterprises above designated size nationwide, with a total output of 8.3 million tons, ranking third in the world. In September 2017, fifteen ministries and commissions including the National Development and Reform Commission, the Energy Bureau, and the Ministry of Finance jointly issued the "I...

Claims

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Application Information

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IPC IPC(8): C12P7/06
CPCC12P7/06Y02E50/10
Inventor 张建华王柯张宏建陈旭升毛忠贵
Owner JIANGNAN UNIV
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