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Method for partially recycling anaerobic digestion solution to serve as mixing water for alcohol production

A production method, anaerobic digestion technology, applied in the direction of biofuel, waste fuel, fermentation, etc., can solve the problems of increasing cost, using chemicals, affecting the reuse effect of anaerobic digestion liquid, etc., to reduce alkalinity and avoid inhibition , The effect of exempting equipment investment

Inactive Publication Date: 2017-05-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The breakpoint chlorine addition method and the blow-off method both belong to physical and chemical methods. The common disadvantage of these two methods is that they all need to use chemicals
The use of chemicals will not only increase the cost, but if it is used for deammonization of anaerobic digestion liquid, the added chemicals will affect the reuse effect of anaerobic digestion liquid

Method used

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  • Method for partially recycling anaerobic digestion solution to serve as mixing water for alcohol production
  • Method for partially recycling anaerobic digestion solution to serve as mixing water for alcohol production
  • Method for partially recycling anaerobic digestion solution to serve as mixing water for alcohol production

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The present invention adopts the following process steps in a process of using anaerobic digestion effluent as part of the mixing water for alcohol fermentation:

[0025] Mix cassava flour with the previous batch of anaerobic digestion effluent clear liquid and tap water, the ratio of material to water is 1:3, the proportion of anaerobic digestion effluent to the total mixing water is 50% (v / v), add high temperature resistant α-starch Enzyme (10U / g starch), stir well, heat to 90°C and maintain for 100min; cool down to 60°C, add glucoamylase (180U / g starch), stir well, keep warm for saccharification for 30min. After the saccharification was completed, the temperature was lowered to 30° C., and 15% (v / v) yeast seed solution was inserted to start fermentation, and the fermentation time was 42 hours. After fermentation, alcohol and distiller's grain wastewater are obtained through distillation and rectification. The distiller's grains are centrifuged to obtain the distille...

Embodiment 2

[0029] The present invention uses the following process steps in a process of using anaerobic digestion effluent as part of the mixing water for alcohol fermentation:

[0030]The corn flour was mixed with the previous batch of anaerobic digestion effluent clear liquid and fresh surface water, the ratio of material to water was 1:2.2, and the proportion of anaerobic digestion effluent to the total mixing water was 35% (v / v). Add high-temperature-resistant α-amylase (15U / g starch), stir well, heat to 95°C and maintain for 120min; cool down to 60°C, add glucoamylase (200U / g starch), stir well, and keep warm for saccharification for 15min. After saccharification, the temperature was lowered to 30° C., and 20% (v / v) yeast seed solution was inserted to start fermentation, and the fermentation time was 52 hours. After fermentation, alcohol and distiller's grain wastewater are obtained through distillation and rectification. The distiller's grains are centrifuged to obtain the distil...

Embodiment 3

[0035] The present invention adopts the following process steps in a process of using anaerobic digestion effluent as part of the mixing water for alcohol fermentation:

[0036] Mix cassava flour, wheat flour and corn flour with the last batch of anaerobic digestion effluent, tap water and tank washing water, the ratio of material to water is 1:3, and the proportion of anaerobic digestion effluent to the total mixing water is 10% (v / v) . Add high-temperature resistant α-amylase (10U / g starch), stir well, heat to 90°C and maintain for 100min; cool down to 59°C, add glucoamylase (180U / g starch), stir well, then cool to 30°C, saccharification time 0 min, insert 15% (v / v) yeast seed solution to start fermentation, and the fermentation time is 42 hours. After fermentation, alcohol and distiller's grain wastewater are obtained through distillation and rectification. The distiller's grains are centrifuged to obtain the distiller's grains clear liquid, and the distiller's grains cle...

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Abstract

The invention discloses a method for partially recycling anaerobic digestion solution to serve as mixing water for alcohol production, and belongs to the field of alcoholic fermentation and comprehensive utilization of alcohol production wastewater. By partially recycling anaerobic digestion solution for alcoholic fermentation, the load of the aerobic digestion stage is reduced, the accumulation degree of ammonia nitrogen in reclaimed water is also reduced greatly, and anaerobic digestion solution can be recycled without being deaminized, so that equipment investment and operation cost for deaminization of anaerobic digestion solution are saved.

Description

technical field [0001] The invention relates to a method for partially reusing anaerobic digestion liquid as mixing water for alcohol production, and belongs to the field of alcohol fermentation and comprehensive utilization of alcohol industrial waste water. Background technique [0002] At present, alcohol production mainly uses starchy crops such as cassava, corn, wheat, etc. as raw materials. The level of alcoholic fermentation is generally 10-20% (v / v), and a large amount of distilled waste mash will be produced after the fermentation broth is distilled. According to statistics, every ton of alcohol produced will produce 10-20 tons of distillation waste mash, and its COD concentration is as high as 40000-50000mg / L. If the waste water is directly discharged, it will cause serious environmental pollution, and the discharge after the treatment reaches the standard will bring a huge economic burden to the enterprise. Therefore, the problem of wastewater has always been a ...

Claims

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Application Information

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IPC IPC(8): C12P7/06C12P19/14C12P5/02
CPCC12P5/023C12P7/06C12P19/14Y02E50/10Y02E50/30
Inventor 张建华王柯张宏建陈旭升毛忠贵
Owner JIANGNAN UNIV
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