Manure management is one of the core environmental challenges faced by large-scale poultry farms. A 10,000-bird layer farm can produce hundreds of tons of fresh manure annually, with moisture content as high as 65-80%. When stockpiled, it ferments, producing odors, breeding flies, and contaminating groundwater. At the same time, dried poultry manure has significant market value as an organic fertilizer ingredient or feed supplement.
Silver Star Poultry Equipment Co., Ltd., with over 30 years of technical accumulation in poultry equipment, has developed a manure air-drying system — an environmentally friendly processing solution that utilizes waste heat from poultry houses for natural drying, helping farms achieve harmless treatment and resource utilization of manure with extremely low energy consumption.
The Silver Star manure air-drying system employs multi-layer conveyor belt natural air-drying technology. Its working principle draws on proven manure air-drying designs, using warm exhaust air from poultry house fans (house temperature approximately 20°C) as the drying medium for layer-by-layer air drying — without high-energy heat sources.
Complete Process Flow:
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Conveying and Feeding: Fresh manure with moisture content ≤75% is discharged from one end of the poultry house via the manure removal belt, then conveyed to the air-drying system's feed inlet and spreading station.
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Spreading and Distribution: A spreading device at the inlet evenly distributes the piled manure onto the top conveyor belt, ensuring uniform drying.
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Layer-by-Layer Drying: Manure starts on the top drying deck and moves downward belt by belt. Each layer is dried using warm exhaust air from the poultry house, with gradual and uniform drying layer by layer.
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Circulating Agitation: At predetermined layers, mixing/crushing devices turn and break up the manure to prevent caking and ensure uniform air exposure.
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Discharge Collection: Dried manure falls from the bottom conveyor belt into the collection area.
| Parameter | Specification |
|---|---|
| Inlet moisture content | ≤75% |
| Outlet moisture content | ≤20% (after 24-48 hours) |
| Air intake method | Dual-channel air intake (increases airflow, shortens drying time) |
| Inlet air temperature | Approx. 20°C (using poultry house exhaust waste heat) |
| Batch processing time | 24-48 hours |
| Operation mode | Continuous, layer-by-layer at uniform speed |
1. Multi-Layer Conveyor Belt Structure: Conveyor belts are arranged in layers — feed inlet at the top, collection area at the bottom. Belts are staggered with alternating gaps, occupying minimal floor space with high space utilization.
2. Spreading and Crushing Devices:
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Leveling Plow: Located near the feed inlet on the top belt, it pushes and spreads piled manure evenly across the belt.
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Crusher: Located at the end of selected conveyor belt layers, it breaks up and turns the manure for uniform air exposure.
3. Dual-Channel Air Intake Design: Combines warm exhaust air from poultry house fans with internal system fans to create dual-channel air intake, significantly increasing airflow during drying, shortening drying time, and maximizing ammonia emission reduction.
4. Fully Enclosed Operation: The drying process is contained within the equipment. Air circulation is maintained by fans, preventing odor diffusion and improving the surrounding environment.
5. Zero Fuel Cost: Unlike thermal dryers, the air-drying system requires no coal, gas, or electric heating — it relies solely on poultry house exhaust waste heat, resulting in extremely low operating costs.
| Dimension | Silver Star Air-Drying System | Traditional Thermal Dryer |
|---|---|---|
| Heat source | Poultry house exhaust waste heat (~20°C) | Coal/gas/electric heating (<700°C) |
| Energy cost | Extremely low (only fan power) | High (fuel + electricity) |
| Outlet moisture | ≤20% (24-48 hours) | 10-13% (hours) |
| Processing speed | Slower (natural air-drying) | Fast (high-temperature forced drying) |
| Equipment investment | Lower | Higher |
| Operating cost | Extremely low | Higher |
| Ammonia emissions | Low (dual-channel intake accelerates drying) | Medium (requires odor control) |
| Applicable scenario | Large-scale farms prioritizing low operating costs | Processing plants requiring rapid processing and commercial sales |
According to industry research, in-house manure air-drying systems can reduce manure moisture content to 12-15% with zero fuel cost. The dried product is easy to handle and can be ground into an odorless product for use as fertilizer or feed ingredient — with significantly higher value than wet manure.
Key Performance of Silver Star Air-Drying System:
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Dual-channel air intake significantly reduces drying time compared to single-channel designs
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Moisture content reduced from 75% to 20% in approximately 24-48 hours
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Maximizes ammonia emission reduction during the drying process, improving farm environmental conditions
| Farm Scale | Recommended Configuration | Expected Output |
|---|---|---|
| 10,000-30,000 birds | Small air-drying unit | On-farm fertilizer use or local sales |
| 30,000-100,000 birds | Medium-sized air-drying system | Bulk organic fertilizer production for sale |
| >100,000 birds, integrated operations | Large multi-layer air-drying line | Commercial organic fertilizer production |
Key Selection Principles:
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Capacity Matching: Select the appropriate number of conveyor belt layers and system size based on daily fresh manure output
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Sufficient Airflow: Ensure poultry house exhaust volume is adequate to support drying; auxiliary fans may be added if needed
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Site Conditions: Install the system near the exhaust end of the poultry house to utilize warm exhaust air
The Silver Star manure air-drying system is a low-energy solution that transforms environmental liability into economic return for poultry farms. Its core value lies in:
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Extremely Low Operating Costs: Utilizes poultry house exhaust waste heat (~20°C) for natural drying — no coal or electric heating required. Only fan electricity is consumed.
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Environmental Value: Reduces high-moisture manure (≤75%) to ≤20% within 24-48 hours, eliminating odors, reducing ammonia emissions, and preventing environmental pollution.
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Economic Value: Dried manure is marketable as organic fertilizer or feed ingredient at prices ranging from RMB 200-650 per ton — turning waste into a revenue stream.
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Proven Technology: The multi-layer belt + spreading/crushing + dual-channel air intake design has been validated in the industry.
For large-scale poultry farms focused on long-term cost optimization, manure air-drying is a more economical choice than thermal drying — turning waste heat from poultry houses into resource value with minimal energy consumption.
This article is based on publicly available patent literature and industry research on manure air-drying technology. Specific equipment specifications are subject to Silver Star Poultry Equipment Co., Ltd.'s latest technical documentation.