Livestock manure mainly refers to a kind of rural solid waste generated in livestock and poultry breeding industry, including pig manure, cow manure, sheep manure, chicken manure, duck manure, etc. With the rapid development of livestock and poultry breeding, the intensive and centralized livestock and poultry manure production in some areas is too large to be absorbed by the traditional fertilization treatment methods, and a large number of piles cause serious pollution to the atmosphere, soil and water environment. On the other hand, due to the rapid development of the chemical fertilizer industry, people use a large number of chemical fertilizers, leaving the amount of organic manure idle, and the basic nutrients of soil gradually decline in some places, Livestock manure can not be returned to the field in time, resulting in the pollution of livestock manure to the environment.

Process flow of organic fertilizer production from livestock and poultry waste: in order to improve the utilization value of livestock and poultry waste and reduce the environmental pollution caused by traditional treatment methods, it is necessary to strengthen the application of organic fertilizer process. At present, the technological process of producing organic fertilizer from livestock and poultry waste mainly includes granulation after fermentation as granular products, powdered products after fermentation, and adding microbial agents as bio organic fertilizer. Among them, the more mainstream process is granulation after fermentation. This paper focuses on the process flow and precautions of granulation after fermentation.

After the materials are processed into particles by the organic fertilizer granulator, they are sent to the dryer by the aging skin, dried by hot air in the downstream direction, and then sent to the roller screen for screening treatment by the outlet elevator after being completely dried. In the screening process, the fine powder with a particle size of less than 1 mm is directly screened out and sent back by the return belt for re granulation; Particles with a particle size of more than 4.75 mm enter the crusher for crushing treatment under the action of gravity, and then are sent back by the return belt for re granulation; The standard particles with a particle size of 1 ~ 4.75 mm are transported to the cooler, and the air is used to dissipate heat. After being cooled to a suitable temperature, they are sent to the packaging drum to mix with other auxiliary materials, and finally sent to the finished product storage bucket for packaging treatment.