2025/12/11
The core process of the double screws compost turning machine involves four key steps: material proportioning and pretreatment, spiral turning and oxygen supply, temperature and humidity control, and fermentation cycle management. These steps directly determine the maturity of the organic fertilizer and production efficiency.
1. Material Proportioning and Pretreatment (Fundamental Key): Mix the main materials (livestock and poultry manure, straw, etc.) with auxiliary materials (sawdust, rice husks, etc.) according to the carbon-nitrogen ratio (C/N 25:1~30:1), and adjust the initial moisture content to 55%~65% (forms a ball when squeezed by hand, but crumbles when dropped).
2. Spiral Turning and Uniform Oxygen Supply: The double-helix mechanism of the equipment penetrates the fermentation pile. Through the rotation, lifting, and scattering actions of the spiral blades, the anaerobic material at the bottom is turned to the surface, and the oxygen from the surface is brought to the bottom, achieving uniform contact with oxygen throughout the entire material layer.
3. Dynamic Temperature and Humidity Control during Fermentation (Crucial for Maturity)
• Temperature Control: The turning frequency is adjusted according to the material temperature – when the material temperature rises to 55~65℃ (high-temperature composting zone), turn the material once every 24~48 hours to maintain the high temperature for 3~5 days to kill pathogens and insect eggs; when the temperature is below 50℃, reduce the turning interval to increase the material temperature.
• Humidity Control: If the moisture content is below 50% during the middle stage of fermentation, water needs to be added through the equipment's spraying system; if the moisture content is too high in the later stage, increase the number of turns to use the fermentation heat to evaporate and reduce humidity. The final moisture content of the mature material should be reduced to below 30%.
4. Fermentation Cycle Management and Discharge Inspection (Quality Key)
• Cycle: The conventional organic fertilizer fermentation cycle is 15~25 days (adjusted according to the type of material; straw-based materials require 25~30 days), ensuring complete maturity through multiple turning cycles.
• Discharge Inspection: Before discharge, the maturity of the material needs to be tested. Unqualified materials need to be returned to the pile for re-turning and fermentation. After passing the test, the material enters the crushing and screening stages of the subsequent bio organic fertilizer produciotn line.
