Livestock and poultry excrement disposal system and method taking energy and fertilizer into consideration

Abstract

The invention discloses a livestock and poultry excrement disposal method taking energy and fertilizer into consideration. The method comprises the following steps of preparing excrement slurry, specifically, excrement and water are mixed in proportion to prepare the excrement slurry with the input concentration of 10%; carrying out fermentation pretreatment of the excrement slurry, specifically,a critical water oxidation reaction is carried out on the excrement slurry, bacteria is killed to break cell gaps to prepare for deep dehydration, and the reacted slurry is cooled; carrying out anaerobic fermentation, specifically, a medium-temperature anaerobic fermentation reaction is carried out on the cooled slurry to generate biogas; and dehydrating and drying, specifically, after fermentation, the slurry is dehydrated and dried to separate biogas residues from biogas slurry.

Description

technical field [0001] The invention relates to a method for producing organic fertilizer by joint disposal of biomass power plant ash residue and livestock manure, in particular to a manure treatment system and method that uses critical water to oxidize manure and dry manure while taking energy and fertilizer into account. Background technique [0002] With the rapid development of economy and society, the development of livestock and poultry breeding has significantly improved the lives of residents, but it has also brought serious pollution problems. It is mainly manifested in three aspects: (1) water pollution, when a large amount of nitrogen, phosphorus and other nutrients are discharged into the water body, it will cause serious water eutrophication problems; (2) air pollution, livestock manure not only contains NH3, H2S , amines and other harmful gases, but also produce foul-smelling gases such as methyl mercaptan, methyl sulfide, dimethylamine and various lower fatty...

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Problems solved by technology

(3) Land pollution. Exfiltration of feces from manure dumps can directly erode farmland. A large amount of nitrogen and phosphorus in feces and urine seep into the ground, which will also cause nitrate nitrogen, hardness and total number of bacteria in groundwater to exceed the standard

[0005] According to the analysis of the characteristics of the existing technology, the pure fertilizer disposal requires a large scale and a long disposal cycle, so it cannot handle a large amount of livestock and poultry manure in a timely manner, and the irritating odor emission cannot be completely controlled during the production process. Directly meet the needs of the current environment

However, the direct thermochemical treatment technology of livestock and poultry manure is limited by its own properties such as high moisture and high ash content, the heat treatment efficiency is low, and the operation and maintenance costs of industrial production are high.

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