Method for preparing organic fertilizer from biogas residues

Abstract

The invention provides a method for preparing an organic fertilizer from biogas residues. The biogas residues are effectively recycled and utilized through mixed aerobic fermentation of garden waste, dehydrated biogas residues and a back-mixing material; through continuous stirring and continuous feeding of high-temperature dry gas in an aerobic fermentation tank, moisture of the mixture is effectively removed, harmful pathogenic bacteria, grass seeds and the like are eliminated, and the harmless and stable requirements are met; and meanwhile, comprehensive and effective recycling of the biogas residues is effectively achieved through cyclic utilization of the back-mixed materials; under the aerobic condition in the aerobic fermentation tank, under the action of aerobic bacteria, organic waste is decomposed, moisture in the materials is evaporated by utilizing decomposition heat of the organic waste, meanwhile, biogas residues are changed into organic fertilizer through continuous entering of continuous high-temperature dry gas, the moisture of the materials subjected to aerobic fermentation treatment is reduced to about 35%, the temperature during fermentation can reach 65-75 DEG C, various pathogenic bacteria, weed seeds and the like are killed, and safe and stable organic fertilizer products can be produced.

Description

technical field [0001] The invention relates to the technical field of urban organic waste treatment, in particular to a method for preparing organic fertilizer from biogas residues. Background technique [0002] With the development of society, kitchen waste is becoming more and more, whether it can be properly disposed of is directly related to food hygiene and safety and people's health. At the same time, with the rapid development of urban sewage treatment in my country, the amount of sludge generated increasing day by day. The existing method of co-processing of kitchen and sludge can not only stably treat organic waste, make it harmless and reduce, but also produce usable biogas and biogas residue to turn waste into treasure. [0003] At present, the deep dewatering process of biogas residue mainly includes three kinds: solar drying process, plate and frame filter press process after chemical conditioning, and high-voltage pulse electrolytic dehydration process. Among...

AI Technical Summary

Problems solved by technology

Among them, the solar drying process occupies a large area, depends on climatic conditions, takes a long time to dry, and has low drying efficiency; after chemical conditioning, the plate and frame filter press process needs to add flocculants such as lime, iron salt, and PAM to change the sludge. characteristics, this method will have a certain impact on the subsequent biogas residue recycling; the high-voltage pulse electrolytic dehydration process has high energy consumption and high dehydration costs

The above methods also have the problems that the degree of material decomposition is not enough, and it is impossible to remove the sterilization and kill the eggs of disease insects in the biogas residue.

[0004] In summary, there are still some defects and problems in the utilization and treatment of biogas residues in the prior art, and it is urgent to provide a method that can effectively recycle biogas residues

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