Biochar based biogas residue organic fertilizer and preparation method thereof

Abstract

The invention provides biochar based biogas residue organic fertilizer and a preparation method thereof, belonging to the field of organic waste resource utilization. The method comprises the steps of blending pig manure and straw in biogas residue, and uniformly stirring to obtain a mixture; adding biochar into the mixture, and performing aerobic fermentation to obtain a biogas residue fermentation product; granulating the biogas residue fermentation product and drying, thus obtaining the biochar based biogas residue organic fertilizer, wherein the ratios of the raw materials are as follows: 50 to 60 percent of the biogas residue, 20 to 25 percent of the straw, 15 to 20 percent of livestock excrement and 2 to 7 percent of the biochar. By adopting the preparation method, not only can the aim of organic waste resource utilization be achieved, but also the functions of improving the efficiency of the organic fertilizer and lowering the activity of heavy metal in the organic fertilizer can be realized, thus producing a high-quality, efficient and environment-friendly char based biogas residue organic fertilizer product.

Description

technical field [0001] The invention belongs to the technical field of agricultural organic fertilizers, and in particular relates to a biochar-based biogas residue organic fertilizer and a preparation method thereof. Background technique [0002] Since the reform and opening up, the output of agricultural products in my country has increased greatly, and the contribution of chemical fertilizers is indispensable. However, with the accumulation of time, the side effects of chemical fertilizers have become increasingly prominent: chemical fertilizers cause soil compaction, affect soil air permeability, and long-term application will reduce soil productivity; chemical fertilizer residues have immeasurable impact on the environment, for example, nitrogen fertilizers will be in the form of nitrate for a long time Groundwater is polluted, and excess nitrogen, phosphorus, and potassium fertilizers enter the water body with rainfall runoff, causing eutrophication of the water body. ...

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Problems solved by technology

[0006] Chinese patent document CN101774848A aims at the problems of difficult dehydration and solidification of biogas residues and high energy consumption of mechanical dehydration and drying, and proposes a process of using shallow ponds to naturally solidify and air-dry. Biogas residues undergo aerobic fermentation, air-drying, and solidification in shallow ponds to achieve granulation Requirements for physical properties; however, the natural curing air-drying process in shallow ponds needs 5-6 months of curing time, and the efficiency of this aerobic fermentation method is not high, which may cause incomplete fermentation

In order to increase production, many biogas residue fertilizer processes have adopted the method of adding chemical fertilizers, such as Chinese patent document CN101229982A (a method of utilizing biogas residue to produce organic compound fertilizer) and CN101774848A (biogas residue organic fertilizer and its preparation method) ; while this results in high yields in the short term, it has a negative effect on the soil in the long run

And, for the production of high-quality green food, the biogas residue fertilizer added with chemical fertilizer is still not suitable

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