As a core pillar of green agricultural development, the production of organic fertilizer is a process that combines both scientific rigor and practical application. The entire operation relies on the coordinated functioning of specialized equipment to facilitate the resource-efficient utilization of waste materials—such as livestock manure and crop straw—ultimately yielding highly effective and environmentally friendly organic fertilizers.
Pre-treatment serves as the foundation of organic fertilizer production; its primary objective is to optimize the characteristics of raw materials, thereby paving the way for the subsequent fermentation stage. First, raw materials—including straw and livestock manure—are pulverized to an appropriate particle size using a half-wet material crusher. For materials with excessive moisture content, a dewatering machine is employed to regulate the moisture level within the 60%–65% range. Subsequently, various raw materials are blended in specific proportions using a mixer to ensure nutritional balance and create optimal conditions for microbial fermentation.
The fermentation stage is critical to the maturation of organic fertilizer; its core function is to utilize microbial activity to decompose the organic matter within the raw materials while simultaneously eliminating pathogens and insect eggs. Medium-sized production facilities typically utilize windrow compost turners to enhance operational efficiency, whereas large-scale facilities (producing tens of thousands of tons annually) are often equipped with large wheel compost turners to achieve automated turning. During fermentation, the temperature must be maintained between 55°C and 65°C for a duration of 7 to 15 days. Throughout this period, turning equipment is used to regulate temperature and humidity levels, ensuring thorough maturation and preventing the finished product from causing "seedling burn" when applied to crops.
The granulation stage is pivotal to enhancing the marketability of organic fertilizer; it bridges the gap between fermentation and post-processing by transforming the matured material into granular form, thereby facilitating easier storage, transportation, and application. The choice of granulation equipment depends on the scale of production: small to medium-sized facilities may opt for new type two in one organic fertilizer granulators—which combine crushing and granulation functions—to minimize equipment investment costs. Large-scale facilities, conversely, are better suited to utilize rotary drum granulators to achieve large-scale, automated production. During granulation, the material's moisture content must be controlled within the 25%–30% range; binding agents may be added in appropriate quantities to enhance granule formation and prevent the finished product from becoming loose or brittle. The particle size of the finished granules is typically controlled within the 2–5 mm range, aligning with standard agricultural application practices.
The post-processing stage focuses on the refinement and purification of the finished product, thereby further enhancing the overall quality of the fertilizer. After undergoing the maturation process and subsequent granulation, the material requires secondary pulverization in a post-processing crusher (specifically targeting poorly formed granules), followed by classification using a vibrating screen to remove impurities and oversized lumps, thereby ensuring uniform particle size in the finished product. If the material's moisture content is excessively high, it must be dried using a drum dryer; following cooling, the moisture level is controlled to remain below 15% to prevent mold growth during storage. Equipment selection at this stage must strike a balance between precision and efficiency to ensure that the finished product complies with agricultural application standards.
The final stage involves packaging and storage, facilitating the standardized warehousing and transportation of the finished product. Fully automated packaging machines can package fertilizers in various specifications according to specific requirements, offering precise weighing and rapid sealing to significantly enhance packaging efficiency. The entire organic fertilizer production process not only achieves the environmentally sound disposal of waste materials but also yields green, high-efficiency fertilizers, thereby contributing to sustainable agricultural development; furthermore, the scientific selection of equipment and adherence to standardized operational procedures constitute the core elements for ensuring a smooth workflow and high-quality finished products.
