Pig manure, a common livestock waste, can be processed into organic fertilizer through scientific methods. This not only allows for the resource utilization of waste but also reduces environmental pollution and contributes to the development of ecological agriculture. The processing process must follow the principles of "harmlessness and resource utilization," mainly encompassing three core stages: pretreatment, fermentation and maturation, and post-treatment. These three stages form the core framework of the organic fertilizer production process, and each stage is interconnected and indispensable.
Pretreatment is the basic step in processing, with the core purpose of removing impurities and adjusting the material ratio. First, fresh pig manure undergoes solid-liquid separation. The separated solid portion is used for fertilizer production, while the liquid portion can be recycled after treatment. Then, manual or mechanical screening is performed to remove impurities such as stones, plastics, and metals, preventing them from affecting subsequent processing and fertilizer quality. At the same time, auxiliary materials such as straw and sawdust are added in proportion to adjust the carbon-nitrogen ratio to 25:1-30:1, and the moisture content of the material is controlled at 55%-65%, creating suitable conditions for subsequent fermentation.
Fermentation and maturation are the key stages in organic fertilizer processing and the core step that determines the final quality of the fertilizer. The pre-treated material is piled into fermentation piles 2-3 meters wide and 1-1.5 meters high, using methods such as windrow composting or trough composting. Regular turning and aeration are performed to promote microbial activity. During fermentation, the material temperature rises to above 55℃ and is maintained for several days, effectively killing pathogens, insect eggs, and weed seeds. During fermentation, temperature and moisture content need to be monitored in real time, and water or auxiliary materials should be added as needed to ensure complete fermentation. Generally, after 20-30 days, the material turns dark brown and has no obvious odor, indicating that maturation is complete.
The post-processing stage aims to improve the marketability of the fertilizer and is the final stage of the organic fertilizer making process. The matured material is crushed to make the particles uniform and fine. Then, it is screened to remove incompletely decomposed impurities. According to market demand, appropriate amounts of trace elements can be added, and then processed through granulation, drying, and cooling to produce granular organic fertilizer. Finally, it is packaged, labeled, and stored in the warehouse for sale.
Through a scientific process, the entire system transforms pig manure into high-quality organic fertilizer, achieving the goal of "turning waste into treasure" and providing strong support for green and sustainable agricultural development.
