Method for improving efficiency of methane production through anaerobic fermentation and methane content in biogas

A technology of anaerobic fermentation and methane content, applied in fermentation, biological sludge treatment, waste fuel, etc., can solve the problems of high carbon-nitrogen ratio of straw, increased cost input, lack of research, etc., so as to increase methane content and improve methane production. Efficiency, the effect of increasing the hydrolysis rate

Inactive Publication Date: 2017-07-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

[0003] However, in the process of anaerobic fermentation of organic waste such as crop straws, the hydrolysis step of the substrate is often considered to be the rate-limiting step of anaerobic fermentation.
And because the carbon-to-nitrogen ratio of straw is too high, it is easy to cause acidification during the fermentation process
Chinese patent CN 103436440 A proposes micro-aerobic pretreatment of straw, followed by hydrogen biogas joint fermentation, but it needs to add straw pretreatment device on the basis of the original fermentation equipment, which increases the cost input
And it is also necessary to add calcium peroxide pretreatment tanks on the basis of the original equipment. It is mainly aimed at the easily degradable organic substances such as sludge. For the continuous dosing of calcium peroxide in the anaerobic fermentation process to improve the fiber substrates such as straw There is still a lack of relevant research on the efficiency of anaerobic fermentation

Method used

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  • Method for improving efficiency of methane production through anaerobic fermentation and methane content in biogas

Examples

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Embodiment 1

[0022] Corn stalks are used as raw materials for biogas fermentation, using the existing medium-temperature solid-state fermentation technology, and carried out in a solid-state fermentation reactor. The solid-state fermentation reactor is equipped with a water bath temperature control and biogas slurry reflux device. Before the start of fermentation, aerated with nitrogen for 3 minutes to remove the oxygen in the system. Then CaO 2 Mix with the raw materials and add to the solid-state fermentation reactor at one time, in which, CaO 2 The diameter is about 1mm, the dosage is 0.064g / g VS 秸秆 , the solid concentration was set to 15% during fermentation, and the fermentation temperature was 37°C.

[0023] At the same time set the control group, the control group does not add CaO 2 , and the rest of the conditions are the same as the experimental group. Wet gas flowmeter was used to measure biogas production, and gas chromatography was used to measure methane content in biogas ...

Embodiment 2

[0025] Corn stalks were used as raw materials for biogas fermentation, and wet fermentation technology was adopted in a 300ml anaerobic fermentation bottle. Before the fermentation started, nitrogen gas was aerated for 3 minutes to remove oxygen in the system. Then CaO 2 Mix with the raw materials and add to the solid-state fermentation reactor at one time, in which, CaO 2 The diameter is about 1mm, the dosage is 0.032g / g VS 秸秆 , the solid concentration was set to 4% during fermentation, and the fermentation temperature was 37°C. The anaerobic fermentation process was carried out in a temperature-controlled water bath shaker at 37°C.

[0026] At the same time set the control group, the control group does not add CaO 2 , and the rest of the conditions are the same as the experimental group. Determination of biogas production by drainage method, determination of methane content in biogas by gas chromatography (see figure 2 ). Depend on figure 2Cumulative methane product...

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Abstract

The invention belongs to the field of biogas production through anaerobic fermentation of organic solid wastes and particularly discloses a method for improving the efficiency of methane production through anaerobic fermentation and the methane content in a biogas. CaO2 is added to organic solid waste fermentation raw materials to form a microaerobic environment, thereby improving the efficiency of methane production through anaerobic fermentation and the methane content in the biogas. The method is mainly applied to the field of biogas production through anaerobic fermentation of the organic solid wastes such as straws and manure; the hydrolysis rate of anaerobic fermentation can be improved through adding a little of CaO2 to a reaction system, the methane content in the biogas is increased and the stability of a fermentation system is improved.

Description

technical field [0001] The invention belongs to the field of producing biogas by anaerobic fermentation of organic solid waste, in particular to a method for improving the methane production efficiency of anaerobic fermentation and the content of methane in the biogas. Background technique [0002] Worldwide, a large amount of organic solid waste such as crop straw, livestock and poultry manure, and kitchen waste is produced every year. The rational disposal of the generated waste is a difficult problem of sustainable development. Anaerobic fermentation technology is an ideal means to deal with organic waste such as crop straws, livestock and poultry manure. Anaerobic fermentation technology can not only generate renewable energy-biogas, but also the fermentation residue can be used in agriculture as organic fertilizer. Therefore, anaerobic fermentation has attracted more and more attention worldwide. [0003] However, in the anaerobic fermentation process of organic waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023Y02E50/30
Inventor 郭荣波付善飞许晓辉王琳戴萌
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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