A Mobile System for Swine Depopulation, Pathogen Inactivation, Carcass Disposal, and Cleanup

Myeongseong Lee, Jacek A. Koziel, Brett C. Ramirez, Baitong Chen, Yuzhi Li

Research output: Contribution to conferencePaperpeer-review


Infectious animal diseases can cause severe mortality on infected farms. An outbreak challenges the system and forces difficult decisions to stop the disease progression. We propose an 'all-in-one' concept of a mobile system for on-farm swine depopulation and pathogen inactivation. The system uses vaporized CO2 followed by heat treatment, broadening options for off-site carcass disposal and cleanup. A direct-fired heater supplies heat into the insulated trailer to reach and maintain the inactivation temperature for targeted pathogens. We developed a user-friendly model based on engineering principles for estimating site- and scenario-specific CO2 amounts and times required to inactivate targeted pathogens. Multipoint CO2 injection and improved distribution to animals follow the plug-flow reactor air replacement model. The model illustrates the depopulation and inactivation of two diseases, African swine fever (ASF) and the porcine reproductive and respiratory syndrome (PRRS) viruses. The model allows for dump trailer size, pig number, weights, and environmental conditions input. Model outputs provide users with practical information about the required CO2 injection rate, temperature setpoints, and times to effectively depopulate and inactivate pathogens in carcasses. The concept could be adopted for a routine or a mass depopulation/treatment/disposal with a single or fleet of 'all-in-one' units.

Original languageEnglish (US)
StatePublished - 2022
Event2022 ASABE Annual International Meeting - Houston, United States
Duration: Jul 17 2022Jul 20 2022


Conference2022 ASABE Annual International Meeting
Country/TerritoryUnited States

Bibliographical note

Funding Information:
J.K. and B.R. participation was partially supported by the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project no. IOW05556 (Future challenges in animal production systems: Seeking solutions through focused facilitation; J.K.) and IOW04100 (Physiological basis of animal production, health and welfare; B. R.) sponsored by Hatch Act & State of Iowa funds.

Publisher Copyright:
© 2022 ASABE. All Rights Reserved.


  • African swine fever
  • CO2
  • animal mortalities
  • farm biosecurity
  • heat treatment
  • livestock diseases


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