Introduction
Microbial agents are the core components that differentiate biofertilizer from traditional organic or chemical fertilizers. To maintain their viability and effectiveness during the manufacturing process, it’s essential to choose the right granulation method and know how and when to add these sensitive microbial additives. This blog explores how to properly incorporate microbial inoculants when using a double-roll extrusion granulator, one of the most energy-efficient and microbe-friendly technologies for dry granulation.
Why Use a Double-Roll Extrusion Granulator for Microbial Fertilizer?
Unlike drum or disc granulators that often require moisture or high-temperature drying, the double-roll extrusion granulator is a dry granulation machine. This offers several advantages:
- No need for drying or cooling: Minimizes heat stress on microbial strains
- Low-temperature process: Helps preserve microbial viability
- Compact and energy-efficient: Ideal for small to medium-scale production lines
- High granulation rate: Produces uniform, dense granules suitable for coating and packaging
When and How to Add Microbial Inoculants
To maintain microbial activity and shelf life, timing and method of addition are key:
Step 1: Post-Composting Raw Material Preparation
- Ensure composted raw materials (like cow dung, chicken manure, etc.) are fully decomposed and dried.
- Screen out impurities and balance the C/N ratio and moisture content (below 10%).
Step 2: Add Microbial Agents During Mixing Phase
- Use a horizontal or vertical fertilizer mixer to evenly incorporate the microbial powder or liquid.
- Keep the temperature of raw materials below 40°C to prevent thermal damage.
- Mixing should be thorough but gentle to avoid damaging the microbial cell structure.
Step 3: Feed into Double-Roll Extrusion Granulator
- The mixed material is fed into the granulator without adding additional moisture.
- The granulation occurs through mechanical compression between two counter-rotating rollers.
- No drying is required after granulation, preserving microbial integrity.
Tips to Maximize Microbial Survival
- Choose thermo-tolerant or encapsulated strains for better survival during granulation
- Avoid adding microbial agents too early during high-heat composting
- Maintain clean, hygienic production conditions to prevent contamination
- Store final granules in cool, dry packaging with proper sealing
Conclusion
For manufacturers aiming to produce high-quality microbial biofertilizers, the double-roll extrusion granulator offers an optimal granulation solution. Its low-temperature, binder-free process preserves microbial viability, ensuring your biofertilizer is both effective and shelf-stable. Welcome to visit: https://www.biofertilizerproduction.com/product/roller-compactor-granulator-for-bio-fertilizer-manufacturing/
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