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Use of dispersion modelling for Environmental Impact Assessment of biological air pollution from composting: Progress, problems and prospects.

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Updated: May 2, 2026

Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
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Morphological classification of bioaerosols from composting using scanning electron microscopy.

A Tamer Vestlund1, R Al-Ashaab2, S F Tyrrel2

  • 1Institute for Energy and Resource Technology, Environmental Science and Technology Department, School of Applied Sciences, Cranfield University, Building 40, Bedfordshire MK43 0AL, UK; FIRA International Ltd., Maxwell Road, Stevenage, Herts SG1 2EW, UK.

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|February 26, 2014
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Summary

Bioaerosols from composting are mostly small, single cells or small aggregates. These airborne particles may travel further and have reduced viability due to their size and form.

Keywords:
AggregationBioaerosolsDispersionParticle sizeSEM

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Area of Science:

  • Environmental Science
  • Microbiology
  • Aerobiology

Background:

  • Open windrow composting facilities are significant sources of airborne microbial emissions (bioaerosols).
  • Understanding the physical characteristics of bioaerosols is crucial for assessing their environmental fate and potential health impacts.

Purpose of the Study:

  • To classify the physical morphology of bioaerosols emitted from open windrow composting.
  • To analyze particle size, shape, and aggregation state.
  • To determine the implications of these characteristics for bioaerosol dispersal.

Main Methods:

  • Bioaerosol sampling was conducted at a composting facility using personal air filter samplers.
  • Samples were analyzed using scanning electron microscopy (SEM) to determine particle morphology.

Main Results:

  • Bioaerosols were predominantly released as small (<1 μm) single, spherical cells.
  • Larger single cells (>1 μm) were also observed.
  • Aggregates, typically clusters of 2-3 particles (<10 μm), occurred in smaller proportions and were not attached to debris.

Conclusions:

  • The small size and morphology of these bioaerosols suggest a higher potential for long-range atmospheric dispersal.
  • Increased environmental exposure due to smaller particle size may reduce bioaerosol viability.
  • Further research is needed to fully understand the implications for air quality and public health near composting sites.