A method of reusing anaerobic digestion effluent and distiller's grains to produce ethanol

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...

Examples

Embodiment 1

[0075] A 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] The membrane filtrate and distiller's grains clear liquid are mixed according to the ratio of 70:40, and the concentration of volatile acid is 600mg / L; 100Kg of pulverized corn flour is taken and 300L of mixed solution is added as ingredients, and high-temperature-resistant α-amylase (10U / g starch) is added, After stirring evenly, heat to 86°C and maintain it for 200min; cool down to 60°C, add glucoamylase (180U / g starch), stir well, and keep warm for saccharification for 30min. After the saccharification is completed, the temperature is lowered to 30° C., and 15% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol and distillation waste liquid are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to obtain the ...

Embodiment 2

[0079] A 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 distiller's grains were mixed according to the ratio of 80:20, and the concentration of volatile acid was 300mg / L; the brown rice flour after 100Kg pulverization was added to 260L of mixed liquid ingredients, and high temperature resistant α-amylase (10U / g starch) was added, After stirring evenly, heat to 90°C and maintain for 150min; cool down to 60°C, add glucoamylase (150U / g starch), stir well, and keep warm for saccharification for 30min. After the saccharification is completed, the temperature is lowered to 30° C., and 10% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol, distillation waste liquid and fine tower residue are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to ob...

Embodiment 3

[0083]A 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] Membrane filtrate and fine tower residual liquid are mixed according to the ratio of 90:10, and the concentration of volatile acid is 100mg / L; Get the brown rice flour 1000Kg after pulverizing and add 2600L mixed solution batching, add high temperature resistant α-amylase (8U / g starch) , stir evenly, heat to 95°C and maintain for 100min; cool down to 60°C, add glucoamylase (180U / g starch), stir well, and keep warm for saccharification for 15min. After the saccharification is completed, the temperature is lowered to 30° C., and 12% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol, distillation waste liquid and fine tower residue are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to obtain the wet distiller's...

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...

Examples

Embodiment 1

[0075] A 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] The membrane filtrate and distiller's grains clear liquid are mixed according to the ratio of 70:40, and the concentration of volatile acid is 600mg / L; 100Kg of pulverized corn flour is taken and 300L of mixed solution is added as ingredients, and high-temperature-resistant α-amylase (10U / g starch) is added, After stirring evenly, heat to 86°C and maintain it for 200min; cool down to 60°C, add glucoamylase (180U / g starch), stir well, and keep warm for saccharification for 30min. After the saccharification is completed, the temperature is lowered to 30° C., and 15% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol and distillation waste liquid are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to obtain the ...

Embodiment 2

[0079] A 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 distiller's grains were mixed according to the ratio of 80:20, and the concentration of volatile acid was 300mg / L; the brown rice flour after 100Kg pulverization was added to 260L of mixed liquid ingredients, and high temperature resistant α-amylase (10U / g starch) was added, After stirring evenly, heat to 90°C and maintain for 150min; cool down to 60°C, add glucoamylase (150U / g starch), stir well, and keep warm for saccharification for 30min. After the saccharification is completed, the temperature is lowered to 30° C., and 10% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol, distillation waste liquid and fine tower residue are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to ob...

Embodiment 3

[0083]A 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] Membrane filtrate and fine tower residual liquid are mixed according to the ratio of 90:10, and the concentration of volatile acid is 100mg / L; Get the brown rice flour 1000Kg after pulverizing and add 2600L mixed solution batching, add high temperature resistant α-amylase (8U / g starch) , stir evenly, heat to 95°C and maintain for 100min; cool down to 60°C, add glucoamylase (180U / g starch), stir well, and keep warm for saccharification for 15min. After the saccharification is completed, the temperature is lowered to 30° C., and 12% (v / v) yeast seed liquid is inserted to start fermentation. After fermentation, ethanol, distillation waste liquid and fine tower residue are obtained through distillation. The distillation waste liquid is filtered with a 60-mesh filter cloth to obtain the wet distiller's...

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