Chicken manure, a common waste product in the livestock industry, can pollute the environment if left carelessly. However, with scientific processing, it can be transformed into high-efficiency organic fertilizer granules, a treasure trove of agricultural production. This transformation process involves key steps such as pretreatment, fermentation, and granulation, each of which embodies the wisdom of environmental protection and agricultural recycling.
First, pretreatment. Fresh chicken manure has a high moisture content and is rich in impurities. It must first be screened to remove impurities such as feathers and straw. Then, auxiliary materials such as rice husks and sawdust are added to adjust the moisture content to around 60%. This prevents rancidity caused by excessive moisture during the subsequent fermentation process and provides sufficient oxygen for microbial activity, laying the foundation for efficient fermentation.
Next, the core fermentation stage begins. The pretreated chicken manure is piled into a 1.5-meter-high fermentation pile, inoculated with specialized microbial strains, and regularly turned using a compost turner for oxygen supply. Under the action of microorganisms, the organic matter in the chicken manure gradually decomposes, raising the temperature to 50-60°C. This high temperature kills insect eggs, pathogens, and weed seeds, eliminating harmful substances. After 20-30 days of composting, the manure becomes a dark brown, odorless, and soft material, making its nutrients more readily available to crops.
After fermentation is complete, the manure enters the granulation stage. The composted material is crushed to an 80-mesh fineness and fed into a granulator. Through extrusion or disc rolling, the material is formed into granules with a diameter of 2-5 mm. This form not only facilitates transportation and storage, but also controls the rate of nutrient release and prevents fertilizer loss.
Finally, the granules undergo drying, cooling, screening, and packaging. Freshly produced granules have a high moisture content, which requires a drum fertilizer dryer to reduce to below 15%. They are then cooled to room temperature in a drum fertilizer cooler to prevent clumping. Then, qualified particles of uniform size are screened out through a screening machine, and the unqualified fragments are returned for re-granulation. Finally, they are weighed and packaged. Bags of high-quality organic fertilizer particles can be transported to farmland to provide nutrients for the growth of crops, achieving the perfect transformation from "waste" to "resources."
