Organic Fertilizer Granule and Powder Production Line in Uruguay

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Why Uruguay? (Market Context for Organic Fertilizer)

Uruguay’s agricultural sector is dominated by cattle ranching (80-85% of agricultural land) and grain production (soybeans, wheat, corn, rice).

Organic agriculture in Uruguay:

The problem: Conventionally raised cattle produce manure, but most is left on pasture (inefficient nutrient utilization). Confined animal operations (pig farms, poultry houses, dairy feedlots) generate concentrated manure that can pollute water bodies (Uruguay has strict water quality regulations under Decree 253/979).

The opportunity: Organic certification (EU, US, Japan standards) requires organic inputs. Fertilizer is the first step. The client’s product meets Uruguay’s Ministry of Livestock, Agriculture and Fisheries (MGAP) standards for organic inputs.

Target customers:

The client’s breakeven point is 6,000 tons/year (60% capacity). Their distribution network (through agricultural cooperatives) guarantees 4,000 tons, so they need only 2,000 additional tons to break even.

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Raw Materials: Manure and Crop Residues

The client’s raw materials are sourced from local farms:

Wait, the input is 10,502 tons for 10,000 tons output? Yes. The difference (502 tons) is:

• Dust collected in filters (3.7 tons, recycled)
• NH3 and H2S emitted during fermentation (1.87 tons)
• Water evaporated during fermentation and aging (about 8,053 tons — most of the “loss”)
• The client adds 7,560 tons of water during mixing to achieve 60% moisture, then loses it during fermentation/aging

Raw material quality control:

• The client only accepts manure from farms with veterinary health certificates (free of disease)
• Straw must be dry (moisture <15% — tested with hand-held meter)
• The client rejects any load with visible plastic, metal, or medical waste
• Manure arrives in sealed vacuum trucks — no contact with outside air

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The Site and Building

The client’s site is on former agricultural land (reclassified as industrial use with a permit from the Durazno Municipal Government).

Building layout:

Production building layout (80m × 50m, 8m ceiling):

The client chose a single-story layout with enclosed rooms for odor control.

Fermentation bays details:

• Dimensions: 20m long × 6m wide × 2.5m deep (usable depth)
• Floor: Concrete + HDPE liner
• Aeration: Perforated pipes at the bottom connected to a blower (forced aeration)
• Leachate collection: Sloped floor drains to a 50m³ collection tank (reused in mixing)
• Maximum capacity per bay: 20 × 6 × 2.5 × 800 kg/m³ = 240 tons (3 bays × 240 = 720 tons total)
• Fermentation cycle: 15 days → daily throughput: 720 ÷ 15 = 48 tons/day (enough for 10,000 tons/year)

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Equipment Configuration 

The client chose a complete organic fertilizer line from RICHI:

Equipment cost (FOB Qingdao): $118,000 USD

Why this configuration for organic fertilizer:

1. Straw chopper (15 t/h capacity). The client’s straw is baled (compressed). The chopper uses knife blades and friction to break the bales and cut straw to 2-5cm pieces. Oversized for the line (15 t/h vs 4 t/h needed), but provides buffer capacity.

2. Twin-shaft mixer (50 t/h capacity). The mixer can handle 50 t/h — 10x the required capacity. But the client only runs it for 384 hours/year (batches), not continuously. The client adds water (7,560 t/year) to achieve 60% moisture. The mixer has water spray nozzles.

3. Three compost turners. Each bay has its own turner (a single turner straddling all 3 bays would be cheaper, but the client wanted redundancy). The turner runs on rails.

4. Vertical crusher (5 t/h). After curing/aging (up to 30 days in the aging area), the fertilizer may have lumps. The crusher reduces it to <8mm particles.

5. Ring die organic fertilizer pellet making machine (2.5 t/h). The client only produces 5,000 tons/year of granules, so 2.5 t/h for 2,000 hours (250 days × 8 hours) = 5,000 tons.

6. Two-stage screening: The client uses:

• Rotary screener for powder fertilizer — separates acceptable powder (<0.5mm) from larger particles (return to crusher)
• Rotary screener (GS150×400) for granules — separates >2mm (finished) from <2mm (return to pellet mill)

7. Biofilter system (50,000 m³/h). This is oversized for the facility, but the client wanted to ensure no odor complaints from nearby farms.

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Process Flow

The process of this organic fertilizer production line produces both powder and granular fertilizer from the same fermentation batch. Key steps: crushing & mixing → fermentation → aging → screening (powder) or granulation → packaging.

Step 1: Raw Material Receiving

Straw: Baled straw arrives on flatbed trucks. The client uses a front-end loader to move bales to the straw crushing area.

Manure: Sealed vacuum trucks (20 tons each) arrive at the facility. The driver backs up to the sealed manure storage pit (northeast corner, 400m², 3m deep). The manure is discharged directly into the pit through a sealed connection — no odor escapes. The truck then goes to the wash station.

The client’s wash station:

• Size: 4m × 5m (for trucks)
• The truck is sprayed with water (0.09 m³ per wash)
• Wash water flows to the 150m³ sedimentation pond
• The pond also collects the first 15 minutes of rainwater

Step 2: Straw Crushing

Straw arrives compressed into bales. The chopper must break the bales and cut the straw to 2-5cm pieces.

The front-end loader feeds bales into the straw chopper.

Chopper parameters:

• Type: Knife and friction
• Input: Whole bales (1.2m diameter, 0.2 tons each)
• Output: 2-5cm straw pieces
• Throughput: 15 t/h (oversized, but the client only runs it for 384 hours/year — when batching for fermentation)

Step 3: Batching and Mixing

The client operates in batches for fermentation. Each batch is about 60 tons (one bay’s capacity). The mixing sequence:

Mixing parameters:

• Manure (Cattle Manure / Pig Manure / Chicken Manure) is pumped from the storage pit to the mixer via sealed pipes
• Chopped straw is conveyed to the mixer via enclosed belt conveyor
• Soybean meal residue is added manually (small quantity)
• Water is added through spray nozzles (7,560 tons/year total)
• Microbial starter is added manually

The target: 60% moisture (for optimal aerobic fermentation). The raw materials (manure 50-60%, straw 10%) average 31% moisture, so the client adds 7560 tons of water annually to reach 60%.

The mixer runs for 5-8 minutes per batch. The client produces about 48 batches per year (each batch 60 tons, 48 × 60 = 2,880 tons — wait, that’s too low. Let me check: 10,000 tons/year ÷ 60 tons/batch = 167 batches per year.)

Actually, the client’s fermentation capacity is 3 bays × 240 tons each = 720 tons per cycle. With a 15-day fermentation cycle, that’s 720 × (365 ÷ 15) = 720 × 24.3 = 17,500 tons/year capacity — enough for the 10,000 tons/year of fermented material (the client uses less than full capacity).

Odor at mixing: The mixer is enclosed. Air is pulled from the mixing area and sent to the biofilter.

Step 4: Fermentation

This is the most critical step. Fermentation determines the final product’s organic matter content, pathogen kill, and odor.

The mixed material (60% moisture) is conveyed via enclosed belt conveyor to one of the 3 fermentation bays (each 20m × 6m × 2.5m deep, 240 tons capacity).

Fermentation parameters:

The client uses compost turner — one per bay. The turner runs on rails and straddles the bay.

Aeration: The fermentation bays have perforated pipes at the bottom connected to a blower. The blower runs intermittently (30 minutes on, 30 minutes off) to provide oxygen for aerobic bacteria.

Leachate management: During the first few days of fermentation, moisture is squeezed out of the material and drains to a leachate collection tank. The client reuses this leachate in the mixing process (added to dry batches) — zero discharge.

Fermentation gases: The fermentation process produces CO2, H2O (water vapor), NH3 (ammonia), and H2S (hydrogen sulfide). The fermentation area is enclosed with negative pressure ventilation. Air is pulled through a biofilter before exhausting to atmosphere.

The biofilter process:

1. Odor-laden air enters the tower
2. Air passes through a biological media (wood chips + compost + microorganisms)
3. Microorganisms break down NH3 and H2S into harmless compounds (nitrates, sulfates, water)
4. Clean air exits through a 15m stack (DA002)

The client also sprays a microbial deodorant on the material surface to further reduce odors.

Fermentation completion indicators:

• Temperature drops to 30-40°C
• Material has earthy smell (not ammonia)
• Material is dark brown, crumbly

Step 5: Curing / Aging

After 15 days of active fermentation, the material may still have high moisture (>30%). The client moves it to the curing area (400m²).

Curing parameters:

• Duration: Up to 30 days (depending on moisture)
• Purpose: Allow moisture to evaporate (water vapor removed by ventilation)
• Target moisture: <30% (for powder) or <25% (for granules)

Odor during curing: The curing area is enclosed with negative pressure ventilation. Air is sent to the same biofilter.

Step 6: Powder Fertilizer Production

If the client is producing powder fertilizer (5000 tons/year):

Vertical crusher:

• Input: Cured fertilizer (moisture <30%)
• Output: <8mm particles
• Dust: Captured by baghouse

Rotary screener:

• Separates powder (0.1-0.5mm) from larger particles
• Acceptable powder goes to bagging
• Larger particles return to crusher

Powder packaging:

• Bag sizes: 20kg, 25kg, 50kg
• The powder is bagged directly (no further processing)

Step 7: Granular Fertilizer Production

If the client is producing granular fertilizer (5000 tons/year):

Compost granulating machine:

Drying: The organic fertilizer granulator machine has integrated electrical heaters to dry the granules to <25% moisture.

Granule screener:

• Acceptable granules (>2mm) → packaging
• Fines (<2mm) → return to pellet mill

Granule packaging:

• Bag sizes: 20kg, 25kg, 50kg

Step 8: Finished Product Storage

Bagged fertilizer is stacked on pallets (40 bags × 25kg = 1,000kg/pallet) and stored in the finished product area. The warehouse holds about 375 tons of finished product (about 30 days of production).

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Utilities and Consumption

Electricity breakdown (annual):

• Straw chopper: 45 kW × 384 hours = 17,280 kWh
• Mixer: 30 kW × 384 hours = 11,520 kWh
• Compost turners (3): 15 kW × 2,000 hours (intermittent) = 30,000 kWh
• Crusher: 37 kW × 2,000 hours = 74,000 kWh
• Powder screener: 7.5 kW × 2,000 hours = 15,000 kWh
• Pellet mill: 90 kW × 2,000 hours = 180,000 kWh
• Granule screener: 5.5 kW × 2,000 hours = 11,000 kWh
• Bagging scales (2): 6 kW × 2,500 hours = 15,000 kWh
• Baghouse fan: 30 kW × 3,000 hours = 90,000 kWh
• Biofilter fans: 75 kW × 8,760 hours = 657,000 kWh (but this is 24/7 for the biofilter — likely lower)

The total is about 600,000-700,000 kWh/year.

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How RICHI Customized This Line for Uruguayan Conditions

The client had specific requirements that shaped the equipment design:

Requirement 1: The client wanted to produce both powder and granular fertilizer from the same line. Powder fertilizer is cheaper to produce (skip granulation), but granular fertilizer commands a higher price.

RICHI solution: Designed the line with a split after aging/curing. The client can send material:

• Directly to the crusher → powder screener → bagging (powder fertilizer)
• To the manure pellet mill → granule screener → bagging (granular fertilizer)
  The split is manual (the operator diverts the conveyor).

Requirement 2: The client’s manure arrives at high moisture (45-62%). Mixing with dry straw (10%) wasn’t enough to reach 60% moisture (they actually need to ADD water — waiting, that’s counterintuitive.)

Let me check: Manure is 45-62% moisture. Straw is 10%. The target for fermentation is 60%. So the client adds water (7,560 tons/year). That’s correct — they need more water, not less.

RICHI solution: The mixer has water spray nozzles. The client also reuses leachate (from fermentation) and condensation water (from the biofilter) as make-up water.

Requirement 3: Uruguayan farmers have a strong preference for locally produced inputs. The client needed to compete with imported organic fertilizers from Argentina and Brazil (which have higher transport costs).

RICHI solution: The client’s production cost is about 15-20% lower than imported products. The equipment line is efficient, and raw materials are free or very cheap.

Requirement 4: The client has 20 staff, most with no prior fertilizer production experience. The client’s workers are agricultural laborers from nearby farms.

RICHI solution: Provided a 3-week on-site training program:

• Week 1: Fermentation management (temperature monitoring, turning schedule, leachate management)
• Week 2: Crusher, screener, and pellet mill operation
• Week 3: Quality control (moisture testing, organic matter testing, particle size)

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Product Specifications

The client’s products meet Uruguayan Ministry of Livestock, Agriculture and Fisheries (MGAP) standards for organic inputs.

Powder bio-organic fertilizer:

Granular bio-organic fertilizer:

Pricing (as of August 2025):

Comparison with imported organic fertilizer:

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Market Outlook for Organic Fertilizer in Uruguay

Uruguay’s organic fertilizer market is growing at about 10-15% annually. Key drivers:

1. Export requirements. The EU requires organic certification for imported beef and wine. Fertilizer is part of that certification.

2. Soil degradation. Uruguay’s soils have low organic matter (2-3%) due to decades of conventional farming. Farmers are looking to rebuild soil health.

3. Government support for organic agriculture. Law 18.856 (2012) promotes organic production.

4. Input substitution. Imported fertilizers are expensive. Local production is cheaper.

Competition: There are 10-15 organic fertilizer producers in Uruguay, most small-scale (1,000-5,000 tons/year). The client’s 10,000 tons/year makes them one of the largest.

Challenges the client is managing:

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Why an Organic Fertilizer Line Makes Sense in Uruguay

Uruguay has abundant cattle manure, crop residues, and a growing organic agriculture sector. Here’s why you should consider this market:

Manure is free or very cheap. The client pays 200 UYU/ton ($5) for manure — the farmers are happy to get paid for something they used to have to manage.

Straw is cheap. Wheat is one of Uruguay’s main crops. Straw is available for 500 UYU/ton ($12.50) — much less than in other countries.

Export markets are demanding organic certification. The EU, US, and Japan require certified organic inputs. The client’s product meets those standards.

The government is supportive. Uruguay’s agricultural policies favor organic production.

If you’re considering an organic fertilizer line in Uruguay (or any agricultural country with cattle/pig/chicken farming), RICHI can help. We’ve designed lines for livestock manure, crop residues, and other organic wastes. We understand the challenges (odor control, leachate management, fermentation) and can recommend the right equipment.

Contact us to discuss your organic fertilizer production project. Tell us about your raw materials (type, moisture, volume), target products (powder, granules, or both), site conditions, and budget. We’ll prepare a customized process flow, equipment list, and budget estimate — no obligation.

RICHI Machinery – Organic fertilizer lines from 5,000 t/year to 100,000 t/year, designed for powder and granular production. Shipping from Qingdao to Montevideo port: 25-30 days. Installation support available in Uruguay within 2 weeks.