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Disposal

Disposal. Thermal Disposal and Other Methods . Adapted from the FAD PReP/NAHEMS Guidelines: Disposal (2012). Thermal Disposal Methods . Thermal Methods Overview . High-temperature combustion Diesel fuel, propane, furnace, waste oils Do NOT use gasoline

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Disposal

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  1. Disposal Thermal Disposal and Other Methods Adapted from the FAD PReP/NAHEMS Guidelines: Disposal (2012)

  2. Thermal Disposal Methods FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods

  3. Thermal Methods Overview FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • High-temperature combustion • Diesel fuel, propane, furnace, waste oils • Do NOT use gasoline • Transmissible Spongiform Encephalopathy (TSE) agents rendered non-infectious by • Minimum 1560oF for 15 minutes • Higher temperatures (1830oF) ideal

  4. Fixed-Facility Incineration FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Contained environment • Fueled by diesel, natural gas, propane • Emissions controlled • Highly efficient • Little residue (ash) • High fat carcasses burn more quickly

  5. Fixed-Facility Incineration FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • On-site incinerators • Large animal production facilities, vet schools/diagnostic laboratories, etc. • Limited continuous capacity • Other waste incineration facilities • Municipal solid waste facilities, etc. • Unlikely to accept animal carcasses • Batch feed, and low heating value

  6. Open-Air Burning FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • History of used • “Uncontrolled” • Fuel and air inputs not controlled • Incomplete/smoky, low-temp combustion • Lengthy process • May be prohibited by States

  7. Open-Air Burning FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Negative public perception • Use isolated areas • Use trained personnel • Involve fire authorities • Open fields, pyres • Combustible materials • Hay, straw, dry timbers • Ash disposal / pathogen escape

  8. Air-Curtain Incineration FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Combination of forced air and fuel used to burn carcasses or waste • Increased temperature • Accelerated combustion (up to 6x faster than open-air burning) • Fan/manifold delivers high-velocity air into metal box or burn pit • Mobile or fixed technology

  9. Air-Curtain Incineration FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Systems vary in size and speed of throughput • Can produce noise • Require fuel • Dry wood • Coal • Diesel (fire and fan) • Produces ash

  10. Other Disposal Procedures FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods

  11. Alkaline Hydrolysis FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Process • High temperatures (steam heat), pressure, and pH (strong base) • Solid by-products and sterile aqueous solution produced • On-site or fixed location • Low carcass capacity, but effective against pathogens such as TSEs

  12. Anaerobic Digestion FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Lactic acid fermentation • Ground carcasses mixed with lactic acid bacteria and fermentable carbohydrates • Produces water, methane, CO2 • Does not inactivate prions • Process takes 7-10 days • Produces odors, store in sealed and controlled-vented containers

  13. Gasification FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Emerging thermal technology • Slow heating occurs in containers • Gasification and combustion chambers • Batch or continuous process • Converts carcasses into gasses and ash • Carbon dioxide, carbon monoxide, methane • Process takes up to 12 hours

  14. Plasma Vitrification FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • Electrically generated heat used to ionize compressed air • High temperatures (7000°C +) • Water is vaporized • Reduces biomass by 97% • Converts carcasses to rock-like solid residue • Resistant to leaching

  15. For More Information FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods • FAD PReP/NAHEMS Guidelines & SOP: Disposal (2012) • http://www.aphis.usda.gov/animal_health/emergency_management/ • Disposal web-based training module • http://naherc.sws.iastate.edu/

  16. Guidelines Content FAD PReP/NAHEMS Guidelines: Disposal - Thermal Disposal and Other Methods Authors Reneé Dewell, DVM, MS (CFSPH) Tom Glanville, PhD (Iowa State University) Significant contributions to the content were provided by USDA APHIS VS: Lori P. Miller, PE Darrel K. Styles, DVM, PhD

  17. Acknowledgments Development of this presentation was by the Center for Food Security and Public Health at Iowa State University through funding from the USDA APHIS Veterinary Services PPT Author: Kerry Leedom Larson, DVM, MPH, PhD, DACVPMReviewers: Janice Mogan, DVM; Reneé Dewell DVM, MS

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