Method for producing biogas through high-efficiency anaerobic fermentation of organic waste resource in intensive vegetable area

Abstract

The invention relates to a method for producing biogas through the high-efficiency anaerobic fermentation of an organic waste resource in an intensive vegetable area. According to the method, an acidification-inhibiting microbial agent is directly added in crushed vegetable wastes to be mixed with the crushed vegetable wastes. Or, one or more than two components selected from fresh cow manure, fresh swine manure and straws processed by a fungicide are added in crushed vegetable wastes to be mixed with the crushed vegetable wastes. After that, water is added and stirred evenly and the C / N ratio and the water content of the obtained mixture are adjusted to be (20-30):1 and 88-90% correspondingly. In this way, a mixed material is obtained. Then an inoculum is added. The TS and the pH value of the obtained material are adjusted to be 8-12% and 7.7-8.0 correspondingly, so that a fermentation material is obtained. The fermentation material is subjected to anaerobic fermentation at the temperature of 35-38 DEG C. According to the technical scheme of the invention, vegetable wastes, adopted as a resource, are subjected to anaerobic fermentation to generate biogas. In this way, the problem that vegetable wastes are randomly piled to pollute the environment can be avoided. Meanwhile, the biogas production efficiency through the anaerobic fermentation process of vegetable wastes can be improved at the same time.

Description

technical field [0001] The invention relates to a method for treating organic waste in an intensive vegetable area, in particular to a method for producing biogas by efficient anaerobic fermentation of organic waste in an intensive vegetable area, and belongs to the technical field of biogas. Background technique [0002] Since the implementation of the "Vegetable Basket" project in 1988, the output of vegetables in our country has continued to increase, the varieties have become more abundant, and the quality of life of the people has improved significantly. The economic development of the intensive vegetable area has made great progress, and the vegetable industry has gradually become the pillar of the economic development of the intensive vegetable area and the increase of farmers' income. [0003] But at the same time, highly intensive production methods produce a lot of vegetable waste. According to statistics, in a 350 mu vegetable garden, the total amount of various ...

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Problems solved by technology

[0005] Chinese patent document CN101153289A discloses a method for preparing biogas by fermenting vegetable waste as a raw material. The method uses vegetable waste as a single fermentation raw material, and by adjusting the initial pH value and adding charcoal powder, the fermentation proceeds normally, but the vegetable waste The content of easy-to-use components such as monosaccharides is rich, and the speed of microbial hydrolysis and fermentation is fast, resulting in a high accumulation of VFA in the fermentation system, and a rapid decrease in pH value, which easily leads to acidification of the fermentation system and inhibits the physiological activity of microorganisms, resulting in fermentation failure.

[0006] Chinese patent document CN101734961A discloses a method for treating vegetable straw waste. Through research on the composition and properties of vegetable straw waste, a harmless treatment method is provided for concentrated stacking of vegetable straw waste and inoculation of compound microbial fermentation. , the process is relatively simple, but the processing time is long, the efficiency is slow, the harmful gas produced by stacking and fermentation pollutes the environment, and it cannot generate new energy ~ biogas, and the effective resource recycling of waste has not been realized

In this method, vegetable and fruit wastes are soaked in biogas slurry for pretreatment, the pH value of the mixture is adjusted between 7.0 and 8.5, and biogas microbial agent is added, which is mainly used in household biogas digesters to solve the problem of lack of raw materials for household biogas digesters. The method is also a single fermentation of vegetable and fruit waste, which does not take into account the problem of easy acidification of vegetable and fruit waste

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