Precision formulation of raw materials. Raw materials—such as livestock manure and crushed straw—are weighed according to a set recipe and thoroughly mixed in a mixer. During this process, the moisture content is adjusted to 55%–65%, and the carbon-to-nitrogen (C/N) ratio is balanced to between 25:1 and 30:1. The prepared mixture is evenly loaded into one end of the fermentation tank by a loader or distribution vehicle, piled to a preset height, and leveled at the surface.

Static heating phase. No turning takes place during this stage, allowing aerobic microorganisms to naturally proliferate and metabolize under optimal conditions. Heat generated by microbial activity causes the internal temperature to rise above 50°C within 24 to 48 hours; the turner remains inactive to accelerate this temperature rise.

High-temperature turning phase. The double screws compost turning machine begins scheduled operations. The machine travels slowly along the tank rails while the two screw shafts rotate at set speeds. The spiral blades lift material from the tank bottom, shearing and mixing it, while simultaneously generating axial thrust to advance the material toward the discharge end by a fixed increment. The turner completes one or two full passes daily, maintaining the internal temperature between 55°C and 70°C for a duration of 7 to 10 days.

During the maturation and stabilization phase, the temperature gradually drops below 40°C, and the turning frequency is reduced to once every two or three days. As the material is slowly turned, it undergoes deep organic matter degradation and humification, while moisture content further evaporates to approximately 30%. With each turning cycle, the material moves steadily toward the discharge end; after traversing the full length of the fermentation channel over 15 to 20 days, the material removed from the discharge end is fully matured organic fertilizer.