With the development of large-scale pig farming, the resource utilization of pig manure has become crucial for environmental protection and green agricultural development. The pig manure organic fertilizer production line, through the coordinated operation of a complete set of equipment, transforms pig manure into high-quality organic fertilizer, achieving "turning waste into treasure." Its processing flow is standardized and orderly, with each stage of equipment performing its specific function and working closely together.
The processing flow begins with raw material pretreatment, which is fundamental to ensuring the quality of the organic fertilizer. Fresh pig manure is conveyed to a solid-liquid separator, separating solid manure residue from liquid wastewater. This reduces the moisture content of the manure residue to 60%-70%, while simultaneously removing impurities such as plastics and stones. Subsequently, the manure residue is mixed with crushed straw, sawdust, and other auxiliary materials in a twin-shaft mixer, adjusting the carbon-to-nitrogen ratio to a suitable range to prepare for subsequent fermentation.
Fermentation and composting is the core step of the production line. The mixture is fed into a fermentation tank, where a trough-type compost turner periodically turns the compost to increase oxygen and dissipate heat. Simultaneously, it is inoculated with compound microbial agents such as EM bacteria to accelerate the decomposition of organic matter. The equipment precisely controls the fermentation temperature between 55℃ and 70℃ for more than 10 days, effectively killing pathogens and insect eggs. After 15-30 days of maturation, the material becomes a dark brown, odorless, matured compound.
The matured material then enters the deep processing stage. A semi-wet material crusher pulverizes the lumpy material into a uniform powder, which is then sieved through a drum screen to remove incompletely decomposed impurities. Subsequently, the material is precisely proportioned and uniformly stirred with nitrogen, phosphorus, and potassium additives using a batching and mixing equipment, and then granulated into 2-5mm granules using a disc granulator or a new type organic fertilizer granulator.
Finished product shaping and packaging is the final step in the process. The granules are dried in a drum dryer to reduce the moisture content to below 15%, and then cooled to room temperature by a cooler to prevent clumping. A grading sieve separates qualified granules, while unqualified granules are returned for reprocessing. Qualified granules are coated with an anti-caking agent by a coating machine and then quantitatively packaged by an automatic packaging machine for storage or shipment.
The entire production line achieves a closed-loop treatment of pig manure from waste to organic fertilizer through automated equipment collaboration. This not only solves the pollution problem caused by livestock farming but also produces high-quality fertilizer, contributing to the circular development of agriculture and achieving both environmental and economic benefits.
