The difficulty of disposing of accumulated agricultural straw and the restrictions on livestock manure discharge are common environmental challenges facing the crop and livestock industries. This high-capacity, integrated fertilizer production unit—designed for large-scale agricultural bases and organic fertilizer plants—employs a standard process combining aerobic fermentation with wet granulation. It integrates the entire workflow from raw material processing to finished product output, offering strong compatibility, stable daily output, and a high rate of product compliance. It provides a one-stop solution for the synergistic conversion of straw and livestock manure into fertilizer, overcoming industry pain points associated with processing these wastes separately—such as low efficiency, difficult mixing ratios, and limited production capacity.

The system features an integrated, closed-loop design comprising a straw crusher, variable-frequency proportioning conveyor, twin-shaft mixer, trough-type compost turner, disc granulator, drum screener machine ,dryer-cooler, and automatic packaging machine; the process logic strictly adheres to national standards for organic fertilizer production. In the initial stage, the equipment intelligently regulates mixing ratios—targeting the industry-standard C/N ratio of 25:1 to 30:1 (with a manure-to-straw ratio of 4:1) to optimize decomposition and fermentation. The crusher reduces straw to 5–10 mm particles, and the proportioning system ensures precise material control, adjusting the mixture’s moisture content to 55%–65% for high-temperature aerobic fermentation. Utilizing a hydraulic trough-type compost turner, the system facilitates harmless fermentation at high temperatures (55–70°C). By maintaining these high temperatures for over five days within a total 7–15 day cycle, the process effectively eliminates insect eggs and weed seeds while achieving full decomposition and deodorization. This meets national standards for harmless organic fertilizer production and offers fermentation efficiency far superior to traditional open-air composting.

The core of the unit is a disc granulator designed for mixtures containing coarse-fiber crop stalks. It features a continuously adjustable disc inclination angle (40°–60°) and a controllable rotation speed (20–30 rpm) optimized for stalk-manure blends. Granulation relies on the combined forces of gravity, centrifugal force, and friction; the forming rate for composted mixtures remains stable at 85%–90%, with adjustable granule sizes ranging from 2 to 6 mm. The equipment is fitted with a thickened, wear-resistant, and corrosion-proof disc body and an automatic scraper to prevent stalk fibers from tangling and high-moisture manure from sticking or clogging the disc. Capable of 24-hour continuous operation, it processes over 50 tons of raw material daily, classifying it as a high-capacity model. Downstream screening and drying equipment ensure the final product meets national standards—reducing moisture content to below 30%—resulting in dense, durable granules suitable for direct field application. The system offers a high degree of automation, easy operation via variable-frequency control, and low failure rates, eliminating the need for multi-shift manual monitoring.

In summary, this integrated fertilizer production unit is ideal for processing mixtures of livestock manure (cattle, chicken, or pig) and crop stalks (wheat or corn). It features a compliant process, stable output, and simple maintenance, balancing the harmless treatment of agricultural waste with profitable organic fertilizer production. Aligned with policies promoting green, circular agriculture, it is a premier choice for large-scale organic fertilizer manufacturing.