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2020 ; 179
(ä): 106991
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Experimental and numerical study of potential infection risks from exposure to
bioaerosols in one BSL-3 laboratory
#MMPMID32501362
Liu Z
; Zhuang W
; Hu L
; Rong R
; Li J
; Ding W
; Li N
Build Environ
2020[Jul]; 179
(ä): 106991
PMID32501362
show ga
Laboratory-acquired infections (LAIs) are defined as infections of laboratory
staff by exposure to pathogenic microorganisms during an experimental procedure.
For a biosafety level-3 (BSL-3) laboratory with a high potential of exposure,
reducing risks and threats relevant to LAIs has become a critical concern,
especially after the recent outbreak of Novel Coronavirus causing COVID-19 in
Wuhan, China. This study aimed to investigate the spatial-temporal
characteristics of bioaerosol dispersion and deposition of two kinds of
bioaerosols (Serratia marcescens and phage ?X174). A combination of laboratory
experiment and numerical simulation was adopted to explore bioaerosol removal.
Three-dimensional concentration iso-surface mapping in conjunction with flow
field analysis was employed to elucidate bioaerosol migration and deposition
behavior. The total deposition number and unit area deposition ratio were
calculated for different surfaces. The results indicate that bioaerosol
concentration remains stable for up to 400 s after release, and that almost 70%
of all bioaerosol particles become deposited on the surfaces of walls and
equipment. Vortex flow regions and high-concentration regions were determined,
and the most severely contaminated surfaces and locations were identified. Our
results could provide the scientific basis for controlling the time interval
between different experiments and also provide guidelines for a laboratory
disinfection routine. Furthermore, future work regarding laboratory layout
optimization and high efficiency air distribution for bioaerosol removal in a
BSL-3 laboratory should be emphasized.