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Effects of Sanitation Practices on Microbial Dynamics in Meat Processing Environment.

Barun Yadav1, Yi Fan1, Scott Hrycauk1

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|October 18, 2025
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A multistage sanitation process in beef plants showed varying microbial effects. While initial washing increased counts, foaming and degreasing reduced them, with sanitizers having no significant impact on microbial populations.

Keywords:
AirBioaerosolDrainEcologyEnvironmentMeatSanitation

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Area of Science:

  • Food safety and microbiology
  • Industrial hygiene
  • Sanitation science

Background:

  • Microbial contamination on surfaces and air is a critical concern in food processing facilities.
  • Effective sanitation protocols are essential to minimize microbial load and ensure food safety.
  • Understanding the impact of each sanitation stage on diverse microbial communities is vital for process optimization.

Purpose of the Study:

  • To evaluate the efficacy of a multistage sanitation process on microbial populations in a commercial beef processing plant.
  • To assess the impact of different sanitation steps (washing, foaming, degreasing, sanitizing) on conveyor belts, drains, and air.
  • To identify predominant microbial genera and their dynamics throughout the sanitation process.

Main Methods:

  • Sampling of conveyor belts, drains, and air at various stages of a multistage sanitation process.
  • Enumeration of total aerobic counts, Enterobacteriaceae, and coliforms.
  • Detection of Escherichia coli.
  • Microbial community analysis using sequencing.

Main Results:

  • Total aerobic counts increased after warm water washing but decreased after foaming and degreasing (P < 0.05).
  • Peracetic acid and quat-based sanitizers did not significantly affect microbial counts (P > 0.05).
  • Acinetobacter was the predominant genus (46-56% relative abundance) across all sampled locations and stages.
  • Drain surfaces significantly contributed to initial microbiota on conveyor belts, with air becoming dominant after water washing.

Conclusions:

  • The multistage sanitation process demonstrated variable effectiveness, with initial washing potentially increasing microbial load.
  • Foaming and degreasing were more effective in reducing microbial counts than chemical sanitizers.
  • Acinetobacter dominates the microbial landscape in this beef processing environment.
  • Drain and air interfaces play crucial roles in microbial dynamics during sanitation.