Method for realizing co-production of anaerobic biogas production and aerobic fertilizer production of agricultural wastes

Abstract

The invention relates to a method for realizing co-production of anaerobic biogas production and aerobic fertilizer production of agricultural wastes, which comprises the following steps: stirring and mixing the agricultural wastes, sequentially carrying out aerobic pre-heating treatment, anaerobic digestion treatment and aerobic fermentation treatment by using an integrated horizontal roller fermentation device, preparing an organic fertilizer from a product obtained by aerobic fermentation, and outputting the organic fertilizer. Marsh gas obtained by anaerobic digestion is output. Compared with the prior art, the method has the advantages that'in-situ treatment, distributed production and gas and fertilizer co-production 'are realized, and the problems of comprehensive utilization of rural organic wastes, gas for rural life, fertilizer for production and the like can be solved in a distributed, batched and local manner.

Description

technical field [0001] The invention belongs to the technical field of organic waste resource treatment, and relates to a method for realizing the joint production of agricultural waste anaerobic biogas production and aerobic fertilizer production. Background technique [0002] Agricultural waste refers to the organic waste discarded in the entire agricultural production process, mainly including plant residues generated in the process of agricultural and forestry production, animal residues generated in the process of animal husbandry and fishery production, agricultural processing Processing residual waste and domestic waste in rural and urban areas. With the improvement of rural living standards, the amount of agricultural waste is increasing at an annual rate of 8%-10%. Anaerobic digestion is one of the effective technologies currently used to treat a large amount of agricultural and rural waste and realize resource utilization, which mainly includes dry anaerobic diges...

AI Technical Summary

Problems solved by technology

However, the common anaerobic digestion and aerobic fermentation are carried out in separate partitions, and there are problems such as large area, many equipment, high energy consumption, time-consuming and laborious raw material transfer, and affecting the continuous operation efficiency of the project.

[0004] At the same time, existing biogas projects generally use external heat sources to heat the fermentation materials to the medium-temperature biogas fermentation conditions, resulting in high operating costs for biogas projects

[0005] For example, the CN 109020645 A patent discloses a device for producing biogas and organic fertilizer by mixing dry fermented stalks and feces and its use method. This technology focuses on the working process of the heat exchange device, using the heat in the aerobic stage to heat the materials in the anaerobic tank. The effect of synergistic fermentation is achieved, but the problem of difficult heat collection in real conditions is not considered; at the same time, the material is not stirred in any form, which has a certain impact on the fermentation efficiency of gas production in the anaerobic stage and compost in the aerobic stage

[0006] CN 211522159 U patent discloses a kind of dry type anaerobic fermentation and organic fertilizer fermentation integration system, this system solves the problem that the long-axis agitator is difficult to make in the prior art, adopts three groups of agitators to realize the hydrolysis of anaerobic fermentation, produce Accurate control and adjustment of the three stages of acid and gas production, and multiple sets of spray systems to improve fermentation efficiency, such as the biogas slurry spray system in the anaerobic tank, the biogas spray system, and the bacterial agent spray system in the aerobic tank And air injection system, but to a certain extent, it also increases the manufacturing difficulty and complexity of the equipment, and does not consider the problem of raw material temperature control and equipment sealing

At the same time, although the above-mentioned patent mentioned the concept of gas-fertilizer fermentation integration, anaerobic gas production and aerobic fertilizer production are still carried out by different equipment.

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