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A method for improving methane production by high-solid anaerobic digestion of straw

An anaerobic digestion and methane production technology, applied in fermentation, waste fuel and other directions, can solve the problems of low spray efficiency and long time, and achieve the effect of good treatment effect, reduction of water content and optimization of process parameters

Active Publication Date: 2020-12-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has high gas production efficiency, the anaerobic digestion reaction cycle needs to reach 63 days, which is too long, and starting to spray after 28 days after the system biome stabilizes will not achieve a good improvement in the contact between the biophase and the substrate effect, the spray efficiency is relatively low

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  • A method for improving methane production by high-solid anaerobic digestion of straw
  • A method for improving methane production by high-solid anaerobic digestion of straw
  • A method for improving methane production by high-solid anaerobic digestion of straw

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Effect test

Embodiment 1

[0043] This embodiment provides a method for improving methane production by high-solid anaerobic digestion of straw, wherein the method includes:

[0044] Raw materials: corn stalks;

[0045] Production steps:

[0046] (1) Adjust the silage corn stalks with a particle size of 2-3cm to 15%, 20%, and 30% of their solid content with mixed distilled water, and the inoculum is the domesticated biogas slurry taken out of a 37°C constant temperature incubator in advance , Soak the raw materials with the inoculum for 2 hours before the start of the experiment.

[0047] (2) Add the mixture obtained in step (1) to the dry fermentation chamber of the garage-type anaerobic reactor, and spray back from the top. Minutes, no spraying in the fourth week, and the spraying interval is 3 hours. The reaction time for the anaerobic digestion of the mixed raw materials in the reactor to generate methane is 28 days. The reaction temperature was 37±1°C, and the pH was not adjusted.

[0048] In ...

Embodiment 2

[0050] This embodiment provides a method for improving methane production by high-solid anaerobic digestion of straw, wherein the method includes:

[0051] Raw materials: corn stalks;

[0052] Production steps:

[0053] (1) Use mixed distilled water to adjust the solid content of silage corn stalks with a particle size of 2-3cm to 30%. The raw materials were soaked in liquid for 2h.

[0054] (2) Add the mixture obtained in step (1) to the dry fermentation chamber of the garage-type anaerobic reactor, and spray back from the top. 3 minutes every week, no spraying in the fourth week (expressed as (6, 3, 0));

[0055] Method 2: 4 minutes each time in the first two weeks, 2 minutes each time in the third week, no spraying in the fourth week (expressed as (4, 2, 0));

[0056] Method 3: 2 minutes each time in the first two weeks, 1 minute each time in the third week, no spraying in the fourth week (expressed as (2, 1, 0)). The spraying time interval is 3 hours. The reaction ti...

Embodiment 3

[0059] This embodiment provides a method for improving methane production by high-solid anaerobic digestion of straw, wherein the method includes:

[0060] Raw materials: corn stalks;

[0061] Production steps:

[0062] (1) Use mixed distilled water to adjust the solid content of silage corn stalks with a particle size of 2-3cm to 30%. The raw materials were soaked in liquid for 2h.

[0063] (2) Add the mixture obtained in step (1) to the dry fermentation chamber of the garage-type anaerobic reactor, and spray back from the top. Minutes, the fourth week without spraying. The spray intervals were 3 hours, 6 hours, and 8 hours. The reaction time for the anaerobic digestion of the mixed raw materials in the reactor to generate methane is 28 days. The reaction temperature was 37±1°C, and the pH was not adjusted.

[0064] During the 28 days that the reaction was carried out, the volume of gas produced was measured at regular intervals, and the relationship between methane pro...

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Abstract

The invention provides a method for improving straw high-solid anaerobic digestion to produce methane. The method comprises the following steps: (1) immersing ensiling straws into an inoculating solution and pre-mixing, wherein the solid content of the ensiling straws is 20 to 30 percent; (2) adding the mixture obtained by step (1) into a garage type anaerobic reactor, so as to carry out anaerobicdigestion on the mixture to produce the methane; and (3) refluxing biogas slurry back to the top of the garage type anaerobic reactor in an anaerobic digestion process, and spraying the biogas slurryinto the reactor to realize mass transfer. According to the method provided by the invention, a suitable spraying method is preferred for a refluxing system of a high-solid anaerobic digestion system, the mass transferring efficiency can be effectively improved, the contact between a substrate and a microorganism is reinforced and the growth and enrichment of the microorganisms in an anaerobic digestion system are promoted, so that the efficiency of producing the methane through the anaerobic digestion is improved. By adopting the method provided by the invention, energy consumption is reduced to the greatest extent; meanwhile, the water content in biogas residues is greatly reduced and subsequent composting and the like are convenient to realize.

Description

technical field [0001] The invention relates to a method for improving methane production by high-solid anaerobic digestion of straw, and belongs to the technical fields of solid waste treatment control and environmental protection purification treatment. Background technique [0002] Anaerobic digestion refers to the stabilization of organic matter through the metabolic activities of microorganisms under anaerobic conditions, accompanied by methane and CO 2 resulting biochemical processes. Byrant divides this process into a hydrolytic fermentation stage, an acidification stage, and a methanogenic stage. The hydrolytic fermentation stage is mainly played by hydrolytic fermentation bacteria. In this stage, complex organic matter is hydrolyzed and fermented by hydrolytic fermentation bacteria such as cellulolytic bacteria and proteolytic bacteria, and transformed into small molecular organic matter; Under the action of hydrogenacetogenic bacteria, the intermediate products p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 李叶青王祯欣李涛江皓周红军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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