Method and device for producing efficient organic liquid fertilizer by utilizing biogas slurry

Abstract

The invention provides a method and device for producing an efficient organic liquid fertilizer by using biogas slurry. The method comprises the following steps of: S1, primary treatment of a raw material: carrying out primary deodorization and sterilization on biogas slurry by using ferrate and a bacteriostatic agent, and filtering to obtain a primary treatment liquid; S2, retreatment of the raw material: further deodorizing the primary treatment liquid by using micro-nano bubble water, removing suspended fine particle insoluble substances, and filtering to obtain a biogas slurry stock solution; and S3, liquid fertilizer production: freely mixing the biogas slurry stock solution with a nitrogen solution, a phosphorus solution, a potassium solution, an organic solution and a medium trace element mother solution according to different set formulas to obtain a comprehensive-nutrient biogas slurry liquid fertilizer suitable for different crops. The invention also provides a device used by the method for producing a efficient organic liquid fertilizer by using biogas slurry. The method provided by the invention is simple in process, relatively low in construction cost and high in automation degree; and the marketability of the biogas slurry fertilizer prepared by the method is improved, the nutrients are comprehensive, the formula is flexible, and the maximum utilization of the biogas slurry can be realized.

Description

technical field [0001] The invention relates to the field of resource utilization of agricultural waste, and more specifically relates to a method and a device for producing high-efficiency organic liquid fertilizer by utilizing biogas slurry. Background technique [0002] Biogas slurry refers to the residue after anaerobic fermentation of various organic matter such as human and animal manure and straw. With the development of scale and intensification of my country's breeding industry, the main treatment methods for the large amount of livestock and poultry manure produced are generally through biogas projects, that is, through anaerobic biodegradation to treat high-concentration organic wastewater. The current treatment methods of biogas slurry can be divided into low-cost natural ecological purification, high-cost factory treatment and high value-added development and utilization, but these treatment processes will greatly increase the treatment cost; on the other hand, ...

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Problems solved by technology

However, the composition of biogas slurry is complex, which contains a large number of microorganisms, salt ions and solid suspended matter, and direct field application is likely to cause blockage of irrigation equipment; at the same time, reasons such as incomplete deodorization of biogas slurry also cause liquid fertilizers containing biogas slurry The commerciality of fertilizers is not high, resulting in low enthusiasm for fertilizer production

Chinese invention patent CN105819589A discloses a method for deodorizing biogas slurry. The invention only utilizes ferrate and bacteriostatic agent for deodorization, but the deodorization of ferrate mainly oxidizes such as hydrogen sulfide (H 2 S), methyl mercaptan (CH 3 SH), methylsulfide (CH 3 ) 2 S), ammonia (NH 3 ) and other odorous substances, while the odorous substances in biogas slurry include not only hydrogen sulfide (H 2 S), ammonia (NH 3 ), including indole, volatile phenol, etc., and only using ferrate to deodorize can not completely remove the odor in the biogas slurry; meanwhile, the biogas slurry fertilizer prepared by this method is the biogas slurry stock solution, which needs to be diluted when used. For irrigation, a large amount of additional water is required

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