Anaerobic digestion method for improving biogas production efficiency

Abstract

The invention belongs to the technical field of biological fermentation, and discloses an anaerobic digestion method for improving biogas production efficiency, which comprises the following steps: S1, carrying out pretreatment of an organic material: crushing the organic material, stirring, carrying out biochemical pretreatment, and heating for preheating; S2, carrying out anaerobic fermentation on the organic material; S3, utilizing biogas and treating fermentation residues: conveying the biogas to a biogas utilization unit for utilization, separating the fermentation residues to obtain biogas residues and biogas slurry, decomposing and converting the biogas slurry again to generate biogas, liquid sludge and penetrating fluid, and using the biogas residues and the penetrating fluid as biogas manure; S4, carrying out backflow and utilization of liquid sludge: enabling the liquid sludge obtained in the step S3 to flow back into an anaerobic digester for anaerobic fermentation again, and repeating the steps S3 and S4, so that the organic material is fully decomposed and converted; the invention solves the problems of incomplete digestion treatment of organic materials, low conversion efficiency and no independent treatment of sulfur components in biogas in the prior art, and is suitable for biogas production by anaerobic digestion of agricultural rural waste organic materials.

Description

technical field [0001] The invention relates to the technical field of biological fermentation, in particular to an anaerobic digestion method for improving the efficiency of biogas production. Background technique [0002] Climate change is one of the most important and urgent issues in the world at present. As a responsible major country, China proposed in September 2020 the goal of striving to peak its carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060. Agriculture is not only an important source of global greenhouse gas emissions, but also a huge carbon sink system. According to statistics from the Food and Agriculture Organization of the United Nations (FAO), agriculture releases more than 30% of the world's total anthropogenic greenhouse gas emissions, but at the same time, agricultural ecosystems can also offset 80% of greenhouse gas emissions caused by agriculture. Therefore, agricultural emission reduction is an important technical means and has...

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Problems solved by technology

[0005] 1. Anaerobic microorganisms and materials with different degrees of fermentation are mixed in the anaerobic reactor. When the material liquid is discharged, not only will a large amount of active anaerobic microorganisms be lost and the processing efficiency of the anaerobic digester will be reduced, but the unfermented materials will also Biogas can be produced, which is wasteful and polluting;

[0006] 2. If the content of organic matter in the anaerobic reactor is too high for a long time, it will not only cause difficulty in mass transfer in the system, form scum and sediment, but also have a negative impact on the function and performance of the anaerobic reactor;

[0007] 3. The existing anaerobic digestion method does not separately treat the sulfur components in the biogas, and the sulfur components in the biogas are likely to cause damage to generator equipment and corrosion of pipelines;

[0008] 4. After the fermentation residue is treated by the solid-liquid separator, the moisture content of the biogas residue is high, which limits the further reuse of the fermentation residue in the later stage

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