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Method for producing alcohol by using anaerobic effluent in water recycling way

An anaerobic effluent and water resource technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can reduce the consumption of sulfuric acid, reduce the production cost and improve the alcohol content.

Inactive Publication Date: 2011-07-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the anaerobic and then aerobic treatment method can make the effluent discharge up to the standard, the main problems are: first, the aerobic treatment does not produce biogas, and the treatment cost is high; second, the treatment is difficult to complete, and the COD of the discharged wastewater is still as high as 500mg / L or so, it needs to undergo advanced treatment, thereby increasing the cost; third, the investment is large, the land occupation is large, the treated wastewater is directly discharged, and there is no waste of water resources due to recycling
The optimum pH of liquefaction enzyme is between 5.5 and 6.5, and the optimum pH of glucoamylase is between 4.0 and 4.5. Therefore, it is necessary to add a large amount of sulfuric acid to adjust the pH during liquefaction and saccharification. It increases the cost, and at the same time, the introduction of a large amount of sulfate affects the subsequent biogas fermentation, and also increases the alkalinity of the anaerobic effluent, resulting in the consumption of more sulfuric acid in the alcohol fermentation stage, which repeatedly causes a vicious circle

Method used

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  • Method for producing alcohol by using anaerobic effluent in water recycling way
  • Method for producing alcohol by using anaerobic effluent in water recycling way

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Embodiment 2

[0027] Embodiment two: a kind of method of anaerobic effluent water resource production alcohol, adopt following process step:

[0028] 1. For anaerobic biogas fermentation, the alcohol distillation waste liquid is cooled to 60°C and enters the first-stage high-temperature anaerobic UASB reactor. The temperature is maintained at 60°C, the hydraulic retention time (HRT) is 2 days, and the pH is 7.5-8.0. The first-stage high-temperature anaerobic effluent undergoes natural settlement and is cooled to 55°C at the same time. The settled sludge is returned to the high-temperature reactor, and the effluent enters the second-stage high-temperature UASB reactor. Maintain the temperature at 55°C, HRT at 4d, and pH at 7.8-8.2. The biogas generated by the first-stage high temperature and the second-stage high temperature are collected and entered into the cogeneration process;

[0029] 2. The second-stage high-temperature anaerobic effluent enters the oxidation treatment tank, maintai...

Embodiment 3

[0037] Embodiment three: a kind of method of anaerobic effluent water resource production alcohol, adopt following process step:

[0038] 1. For anaerobic biogas fermentation, the wine viscous distillation waste liquid is cooled to 60°C, and enters the first-stage high-temperature anaerobic UASB reactor. The temperature is maintained at 60°C, the hydraulic retention time (HRT) is 3 days, and the pH is 7.5-8.0. The first-stage high-temperature anaerobic effluent undergoes natural settlement and is cooled to 35°C at the same time. The settled sludge is returned to the high-temperature reactor, and the effluent enters the second-stage medium-temperature UASB reactor. Maintain the temperature at 35°C, HRT at 6d, and pH at 8.0-8.2. The biogas generated by the first-stage high temperature and the second-stage medium temperature are collected and entered into the cogeneration process;

[0039] 2. The second-stage mesothermal anaerobic effluent enters the oxidation treatment tank, ...

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Abstract

The invention relates to a method for producing alcohol by using anaerobic effluent in a water recycling way. The method is characterized by comprising the following steps of: filling alcohol waste distillate into an anaerobic methane fermentation tank for carrying out methane fermentation; introducing generated methane into cogeneration for generating electricity; oxidizing anaerobic effluent through air or pure oxygen or hydrogen peroxide or ozone, and the like to be reused as a mixing material, and carrying out alcoholic fermentation by utilizing water to realize water recycling; distilling the fermentation liquor to obtain finished alcohol; and filling waste distillate into the anaerobic methane fermentation tank for the circulation of a next batch.

Description

technical field [0001] The invention relates to a method for the production of alcohol from anaerobic effluent water resources, specifically refers to the anaerobic biogas fermentation of alcohol distillation waste liquid, the anaerobic effluent is oxidized, and then reused for cassava alcohol fermentation to realize anaerobic fermentation The effluent water resource utilization belongs to the technical field of fermented alcohol industry. Background technique [0002] The production of ethanol from potatoes is one of the main methods of ethanol production in my country. In the traditional potato alcohol production process, an average of 10-15 tons of alcohol distillation waste liquid is discharged per ton of alcohol, with a pH of 3.0-4.0, SS of 30-45g / L, and COD of 40000-70000mg / L. Therefore, the disadvantages of the traditional potato alcohol production process are large water consumption, heavy pollution, and high energy consumption. [0003] At present, the treatment m...

Claims

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Application Information

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IPC IPC(8): C12P7/06C02F9/14
CPCY02E50/17Y02E50/10
Inventor 张宏建唐蕾张建华张成明毛忠贵
Owner JIANGNAN UNIV
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