Which type of compost turner pairs best with a disc granulator for organic fertilizer production?

Disc granulators are sensitive to three specific issues in the raw material: excessive coarseness, high moisture content, and uneven decomposition ( the presence of "raw" or under-decomposed material). These problems often originate during the fermentation and turning stage.

1. Deep turning ensures uniform decomposition

Disc granulation requires material that is decomposed evenly, with no "raw" patches. In a fermentation pile, the surface layer typically reaches higher temperatures and decomposes quickly, while the bottom layer often suffers from oxygen deprivation and slow decomposition. If the turning depth is insufficient, the material at the bottom is not brought to the surface; this results in a mixture of well-decomposed and under-decomposed material, leading to inconsistent granulation quality. For a disc granulation production line, a compost turner with a working depth of at least 1 meter is essential to ensure thorough mixing and turnover throughout the entire fermentation trench. A trough-type compost turning machine, which operates on fixed rails with controllable turning depth, offers greater stability than windrow-style turning methods.

2. Shearing capability yields finer material

Disc granulation favors fine, powdery material, yet fermented organic matter often contains fibrous strands and hard clumps. If a compost turner only turns the material without shearing it, coarse fibers remain intact; these hinder the rolling process inside the disc granulator and reduce the granulation rate. A trough-type compost turning machine equipped with shearing blades cuts long fibers during the turning process, resulting in a more uniform, finer output—effectively reducing the need for additional crushing steps before granulation.

3. Frequent turning allows for moisture control

Disc granulation is highly sensitive to moisture content, with an optimal range of just 25%–35%. Regular turning, combined with aeration at the bottom of the trench, facilitates the uniform release of water vapor and prevents localized over-saturation. If the turning frequency is too low, the material will have uneven moisture levels; inside the disc granulator, this leads to a problematic split: some material becomes sticky, forming large, unmanageable clumps, while other parts remain too dry to form granules at all. In summary, a trough-type compost turning machine equipped with shearing blades is the ideal match for a disc granulation production line: it provides consistent turning depth, effective shearing, precise moisture control, and a reliable, rhythmic operational flow. For small-scale production lines using the windrow turning method, it is necessary to increase the frequency of turning and strictly monitor moisture levels to compensate for a lack of uniformity.