Binder-free preparation method for preparing composite carbon-based fertilizer by using biogas residues

Abstract

The invention discloses a binder-free preparation method for preparing a composite carbon-based fertilizer by using biogas residues, which comprises the steps of conducting pretreatment, specifically, collecting biogas residues after solid-liquid separation, air-drying and crushing to obtain dried biogas residue powder; performing high-temperature pyrolysis, specifically, transferring the pretreated dried biogas residue powder into a muffle furnace, and performing pyrolysis for a period of time under a pyrolysis temperature condition to obtain a biogas residue biochar material; preparing a biogas residue carbon-based compound fertilizer; and carrying out granulation preparation, specifically, placing the prepared composite biogas residue biochar base fertilizer in an extrusion die, and performing granulation under certain compression speed and pressure conditions to obtain the granular composite biogas residue biochar base fertilizer. The biogas residues are utilized for reproduction, and the environmental and economic burden is relieved; the process is simple, and the cost is low; a binder is not added, so that the method is environment-friendly; powder is granulated, so that the transportation and application difficulties are solved; and meanwhile, the granules are dried at high temperature after being formed, nutrients are tightly combined with charcoal functional groups, the nutrient release time is prolonged, and the fertilizer quality is improved.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a binder-free biogas residue carbon-based fertilizer particle and a preparation method thereof. Background technique [0002] With the increase of the global population, a large amount of kitchen waste is produced, causing potential environmental and economic burdens. Anaerobic fermentation, as an environmentally friendly way to deal with food waste, is due to its use in renewable energy production and waste reuse. potential has received increasing attention. However, the treatment of food waste anaerobic fermentation residue biogas residues has always been a difficult problem to solve. Domestically, there have been patent applications for using biogas residues as raw materials to make fertilizers, such as: [0003] The publication number is CN101423425A, and the publication date is May 6, 2009. The Chinese patent document entitled "Comprehensive Ut...

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Problems solved by technology

[0009] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a method for preparing composite carbon-based fertilizer particles from biogas residue without adding a binder. The defects of low-yield biochar-based fertilizers, which are not easy to form and have low hardness, solve the problem of low utilization rate of traditional chemical fertilizers

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