Method for preparing fertilizer by anaerobic fermentation of biogas residues of organic wastes

Abstract

The invention discloses a method for preparing a fertilizer by anaerobic fermentation of biogas residues of organic wastes. The method includes mixing biogas residues dehydrated by anaerobic fermentation of organic wastes and auxiliary materials for conditioning; preforming aerobic fermentation through a fermentation system and entering into an aging system; conveying the aged materials into an organic fertilizer production line feeding system by a belt conveyor, and crushing and screening the aged materials by a blade crusher and a raw material feeding and screening machine to produce a crudefertilizer; screening the aged materials, entering, by the undersize materials, into a rotary drum granulation production line, preparing a first granular fertilizer by the rotary drum granulation production line, and returning, by the oversize and the undersize materials, to the crusher in front of a rotary drum granulator; and sending biogas fluid and spraying ingredients to a spraying groove for evenly mixing, and sending the above materials to a spraying granulation production line together with the remaining screened materials in the rotary drum granulation production line to prepare a second granular fertilizer. The method has strong adaptability of raw material change, strong regulation and control capability of the biogas fluid and residue treatment and resource operation management, and the product has better market flexibility.

Description

technical field [0001] The invention relates to the field of anaerobic fermentation of organic waste, in particular to a method for making fertilizer from biogas residue by anaerobic fermentation of organic waste. Background technique [0002] In recent years, with the acceleration of urbanization and the development of modern agriculture, the problem of access to a large amount of organic waste generated in agriculture, industry, and residents' lives needs to be solved urgently. [0003] Anaerobic fermentation of organic waste to produce biogas is one of the important methods for the harmless and resourceful utilization of organic waste, but a large amount of fermentation residues still need to be treated. After solid-liquid separation, the fermentation residue forms biogas slurry and biogas residue. Biogas residues are rich in nitrogen, phosphorus, potassium, organic matter, humic acid, and rich in amino acids, various hydrolytic enzymes, and auxins, which can increase so...

AI Technical Summary

Problems solved by technology

The technology of using biogas residue to make organic fertilizer is relatively mature, but the products produced by enterprises in the market are generally relatively single

Biogas slurry is also rich in amino acids, proteins, hydrolytic enzymes, auxin and other microbial active substances and humic acid. It can be used as base fertilizer, top dressing and foliar fertilizer in the production of liquid organic fertilizer. However, due to its storage and transportation problems, liquid organic fertilizers are limited Widespread application of organic fertilizers

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