Equipment Required for Pig Manure Organic Fertilizer Plants

I. Core Production Process and Equipment Configuration

1. Pretreatment Stage

• Equipment:
  • Solid-Liquid Separator: Removes excess water from pig manure, adjusting moisture content to 55%-65%. Common types include screw-type, inclined screen, and drum separators, with inclined screen separators widely used for stainless steel construction and high efficiency.
  • Conditioning Equipment: Adjusts carbon-to-nitrogen ratio (C/N ratio 20-30) and pH (5.5-8.5), potentially adding straw, fungal residues, or other auxiliary materials.

2. Fermentation Stage

• Equipment:
  • Compost Turner:
    • Windrow Turner: Suitable for outdoor windrow composting, promoting aerobic fermentation at 50-65°C for 10-15 days.
    • Trough Turner: Operates within fermentation troughs, ideal for large-scale production.
    • Intelligent Fermentation Tank (optional): Closed-loop aerobic fermentation with automatic temperature and odor control, 15-day cycle, suitable for high-capacity plants.
  • Aeration System: Uses blowers or aerators to supply oxygen for aerobic microbial activity.
  • Monitoring System: Real-time tracking of temperature and humidity to ensure complete maturation.

3. Deep Processing Stage

• Equipment:
  • Crusher: Semi-wet material crusher processes fermented material to 1-3mm particle size.
  • Mixer: Horizontal mixer blends trace elements (e.g., NPK) or functional bacteria (e.g., phosphate-solubilizing bacteria).
  • Granulator:
    • Pan Granulator: Cost-effective for small-scale production.
    • Drum Granulator: Suitable for continuous large-scale production with uniform particles.
    • Extrusion Granulator: Requires no drying, ideal for low-moisture materials.
  • Dryer and Cooler:
    • Rotary Dryer: Reduces particle moisture to <20% at ≤80°C to preserve microbial activity.
    • Rotary Cooler: Lowers particle temperature to prevent caking.
  • Screener: Rotary screener grades particles, recycling substandard material to crushing.
  • Coating Machine (optional): Enhances particle hardness and reduces dust.
  • Packaging Machine: Automatic packaging scales for adjustable bag sizes (e.g., 25kg).

4. Auxiliary Equipment

• Conveyors: Belt conveyors and elevators for material transfer.
• Dust Control: Baghouse filters to meet air quality standards.
• Odor Control: Biofilters or activated carbon adsorbers to manage NH₃, H₂S, and other gases.
• Control System: PLC automation for critical processes (fermentation, drying).

II. Environmental Compliance and Supporting Equipment

1. Air Emissions:
   • Install biofilters or chemical scrubbers to meet Emission Standard for Odor Pollutants (GB14554-93).
   • Intelligent fermentation tanks include negative-pressure odor collection systems.
2. Wastewater Management:
   • Implement rainwater diversion and treat wastewater via sedimentation tanks and biological systems (e.g., SBR) for reuse or discharge.
   • Recycle rinse water to minimize freshwater use.
3. Solid Waste:
   • Segregate waste packaging and hazardous materials for licensed disposal.
   • Fermentation residues can be repurposed as soil conditioners.

III. Equipment Recommendations by Scale

IV.Conclusion

Pig manure organic fertilizer plants require tailored equipment based on production scale, with core devices including separators, turners, crushers, granulators, and environmental systems. Auxiliary tools like conveyors and automation enhance efficiency. Strict adherence to environmental regulations—via odor/dust control and wastewater treatment—ensures sustainable operation.