In situ real-time measurement of physical characteristics of airborne bacterial particles
- In situ real-time measurement of physical characteristics of airborne bacterial particles
- 정재희; 이정은
- bioaerosol; real-time; shape; detection; Thermal inactivation; Real-time measurement; Particle shape
- Issue Date
- Atmospheric environment
- VOL 81, 609-615
- Bioaerosols, including aerosolized bacteria, viruses, and fungi, are associated with public health and
environmental problems. One promising control method to reduce the harmful effects of bioaerosols is
thermal inactivation via a continuous-flow high-temperature short-time (HTST) system. However, variations
in bioaerosol physical characteristics - for example, the particle size and shape - during the
continuous-flow inactivation process can change the transport properties in the air, which can affect
particle deposition in the human respiratory system or the filtration efficiency of ventilation systems.
Real-time particle monitoring techniques are a desirable alternative to the time-consuming process of
microscopic analysis that is conventionally used in sampling and particle characterization. Here, we
report in situ real-time optical scattering measurements of the physical characteristics of airborne bacteria
particles following an HTST process in a continuous-flow system. Our results demonstrate that the
aerodynamic diameter of bacterial aerosols decreases when exposed to a high-temperature environment,
and that the shape of the bacterial cells is significantly altered. These variations in physical
characteristics using optical scattering measurements were found to be in agreement with the results of
scanning electron microscopy analysis.
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