Biosecurity Baseline for Small and Medium Pig Farms: Application Record of On-Site Animal Carcass Incinerators to Completely Block Virus Transmission

In the severe animal disease prevention and control systems for African Swine Fever (ASF), Foot-and-Mouth Disease (FMD), and Classical Swine Fever (CSF), the harmless disposal of dead pigs, placentas, and afterbirths is the most critical link in the "biosecurity red line."

Traditional methods like deep burial or outsourcing to centralized disposal centers have glaring loopholes. Landfill leachate can pollute soil and groundwater, while transport vehicles cross-contacting other pig farms increase the risk of virus spread. Furthermore, centralized plants may face capacity saturation, leading to prolonged temporary storage and putrefaction.

An animal carcass incinerator deployed directly inside the breeding farm is the ultimate solution. Meeting strict agricultural standards for high-temperature sterilization, it uses primary chamber pyrolysis and secondary chamber high-temperature oxidation (≥850–1000°C, residence time ≥2 seconds) to thoroughly burn whole or segmented pig carcasses into sterile ash. Achieving "on-site generation, on-site destruction," it physically severs the pathogen transmission chain.

Based on the actual application of a self-breeding farm in Central China with a herd of 1,200 sows, this article records how on-site incineration fortifies the biosecurity baseline.

Core Risks of Dead Pig Disposal and the Incinerator's Blocking Logic

Dead pigs can carry the ASF virus (which is resistant to low temperatures and drying, surviving in blood for months) and the FMD virus (spread via high contact and aerosols). If disposal is incomplete:

• Deep Burial: If the burial is too shallow (<2m) or the anti-seepage layer breaks, viruses can leach into groundwater or be unearthed by wild boars, maintaining hidden transmission risks. Many regions have banned burying entirely.

• Outsourced Centralized Disposal: Vehicles entering and leaving the farm must be washed and disinfected, but the mere act of "leaving the farm" increases the probability of cross-contamination. Waiting for collection also brings the risk of cold storage saturation and rotting.

The Logic of On-Site Animal Carcass Incinerators:

1. Primary Chamber (Oxygen-starved Pyrolysis at 600–750°C): Gasifies organic matter, decomposes fats and proteins, and evaporates moisture.

2. Secondary Chamber (Independent High-Temp at ≥850°C): For highly resistant viruses like ASF, ≥900–1000°C with a residence time of ≥2 seconds is recommended. This ensures complete denaturation and inactivation of viral nucleic acids and protein structures. WHO and agricultural guidelines specify that sustained temperatures of ≥70°C can kill ASF, but actual incineration far exceeds this limit, achieving a Destruction and Removal Efficiency (DRE) > 99.99%.

3. Ash Residue: The Loss on Ignition (LOI) is <3%–5%, leaving only inorganic minerals (calcium/phosphorus) with zero possibility of pathogen survival. This can be safely processed into organic fertilizer (after testing) or deeply buried.

This makes the animal carcass incinerator the ultimate "terminal firewall" for pig farm biosecurity.

Site Conditions & Equipment Selection: Adapting to the Farm

Farm Overview (Anonymized Data):

• Scale: 1,200 sows; annual market hog output of approx. 24,000. Daily average of 8–12 dead pigs (including piglets and grower pigs, averaging 15–40 kg; occasional culled sows weighing 150–200 kg).

• Existing Facilities: A temporary cold storage room (-18°C) with a volume of about 3 m³ (previously used before outsourcing).

• Available Site: A hardened concrete area next to an abandoned tool shed on the downwind side of the farm (5 m × 4 m, C30 concrete, 15 cm thick).

• Utilities: 380V power (farm backup generator available), deep well water (industrial use), no natural gas (0# diesel burner selected).

Selection Result: BNTET Animal Carcass Incinerator (Batch Horizontal/Vertical Hybrid)

• Capacity: Max 200 kg per batch (can handle 1 adult culled sow + several piglets, or 8–10 medium pigs). Running 1–2 batches a day covers the daily mortality rate.

• Structure: The primary chamber is horizontal (allowing a whole pig tray to be hydraulically pushed in). The secondary chamber is vertical, stacked above. The entire skid-mounted base measures 3.8 m × 2.2 m.

• Temperature Settings: Primary chamber 650–750°C; Secondary chamber ≥900°C (standard) to 1000°C (during suspected disease outbreaks) with residence ≥2s.

• Purification Chain: Rapid Quench Tower (500°C → <200°C in <1s) + Dry Slaked Lime Deacidification + Activated Carbon Injection + PTFE Baghouse. The dry process produces no wastewater, simplifying discharge.

• Loading: Double-layer pneumatic flap doors maintain a negative pressure of -30 Pa inside.

Application Record: Operational Workflows During Epidemic Control

Routine Harmless Disposal (Non-Outbreak Period)

1. Retrieval: Operators wear full PPE (coveralls, boots, gloves). Dead pigs are loaded onto special stainless steel trays (with drainage holes). Over-sized carcasses are cut in half.

2. Loading: The forklift pushes the tray to the outer door → close inner door → open outer door → slide tray onto the primary chamber track → close outer door → open inner door and push in → close inner door.

3. Incineration Curve:

• Primary chamber ramps up to 680°C and holds for 60 mins (pyrolysis of moisture and volatiles).

• Secondary chamber ramps up to 900°C and holds for 60 mins (ensuring complete oxidation).

• Post-burn phase: Secondary chamber raised to 920°C for an extra 20 mins if the fat content is high.

4. Cooling & Ash Removal: After the burner stops, the ID fan runs for 10 mins to cool. Once internal temps are <100°C, the ash (LOI approx. 3%) is removed and stored in sealed metal drums.

5. Disinfection: Trays/tools are soaked in potassium peroxymonosulfate. Personnel shower and change; the forklift passes through the disinfection channel.

   
   

Suspected ASF Outbreak Emergency Drill

If an ASF-positive case is detected on the farm, the secondary chamber temperature setting is immediately raised to 1000°C, and the residence time is extended to 2.5 seconds (by increasing secondary air/adjusting burner power). Incineration time increases by 30 mins per batch to guarantee absolute viral inactivation. Post-burn ash is sent to the lab for sampling, and operational temperature curves are exported via USB as a biosecurity ledger for official veterinary inspection.

Field Performance: Operational Data & Biosecurity Efficacy

Statistics over 8 months of routine operation:

Farm Technician Feedback: "We used to dread piling dead pigs in the cold storage waiting for the truck. Now, pigs that die today are burned today. Only half a bucket of ash is left. It gives us immense peace of mind."

Cost & Compliance Comparison: On-Site Incineration vs. Outsourced Centralized Processing

• Outsourcing Costs: Centralized disposal fees are about 800–1,500 RMB/ton. Adding transport, disinfection fees, and cold storage electricity, the annual cost averages 80,000–100,000 RMB for a medium farm.

• Self-Built Animal Carcass Incinerator: Equipment + installation is approx. 180,000–250,000 RMB. Annual operating costs (diesel + electricity + lime) are about 30,000–40,000 RMB (for 3 t/a of dead pigs). Current harmless-treatment staff manage it without extra salary.

• Biosecurity ROI: Avoids cross-contamination during transport, reduces cold storage pressure, and enables zero-delay destruction during outbreaks. Compliant ledgers ensure smooth official veterinary audits.

• Conclusion: The financial payback period is about 3–4 years, but the biosecurity value is incalculable—a single ASF intrusion leading to whole-herd culling causes tens of millions in losses.

BNTET Animal Carcass Incinerator: Customized for Pig Farm Biosecurity

The BNTET animal carcass incinerator features the following tailored elements for livestock farms:

1. Dual-Chamber Pyrolysis-Oxidation: Primary chamber (600–750°C) + Secondary chamber ≥900°C (adjustable to 1000°C). Corundum-mullite/high-alumina lining resists severe erosion from burning pig fat.

2. Large Inlet & Tray Pushing: Accommodates whole medium pigs (≤100 kg) or segmented large pigs. Double airtight doors reduce direct personnel contact.

3. Dry Purification Chain: Quench + Dry Deacidification + Activated Carbon + PTFE Baghouse. No wet wastewater system is needed, simplifying farm operations. Emissions are smokeless and odorless.

4. Skid-Mounted & Civil-Works-Free: Rests directly on hardened ground. Plug-and-play installation takes 2 days. Optional rain covers and anti-corrosion coatings resist farm ammonia.

5. Biosecurity Ledger: PLC stores temperatures/O₂ at 1-minute intervals for ≥30 days, exportable via USB to assist farm management systems and official inspections.

For small and medium pig farms, the biosecurity baseline is not a slogan—it is the final destination of every dead pig. An animal carcass incinerator deployed downwind within the farm, meeting strict high-temperature sterilization standards, uses a 900–1000°C flame to sever pathogens right on site. It replaces the hidden dangers of deep burial and the cross-contamination risks of outsourcing, transforming "dead pig disposal" from the weakest link into the ultimate biosecurity firewall.

With field-verified thermal engineering and comprehensive data traceability, the BNTET animal carcass incinerator guards the "last journey" of the herd—because reverence for harmless disposal is a responsibility to the survival of the entire farm.