Bacterial population and chemicals in bioaerosols from indoor environment: Sludge dewatering houses in nine municipal wastewater treatment plants

•Chemical and bacterial properties in sludge dewatering house were analyzed.•Levels of airborne bacteria and chemicals showed regional variations.•Bacterial population in bioaerosols also presented significant regional disparity.•Common potential pathogens were detected in bioaerosols from all SDHs....

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Published in:The Science of the total environment Vol. 618; pp. 469 - 478
Main Authors: Han, Yunping, Wang, Yanjie, Li, Lin, Xu, Guangsu, Liu, Junxin, Yang, Kaixiong
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 15.03.2018
Subjects:
Aeromonas punctata
airborne microorganisms
Bacterial population
bioaerosols
Chemicals
China
dewatering
emissions
Flavobacterium
Indoor bioaerosols
municipal wastewater
Municipal wastewater treatment plants
pathogens
pollution
relative humidity
sludge
Sludge dewatering houses
Staphylococcus lentus
temperature
wastewater treatment
China
Sludge dewatering houses
Municipal wastewater treatment plants
Indoor bioaerosols
Bacterial population
Chemicals
ISSN:0048-9697, 1879-1026, 1879-1026
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Summary:•Chemical and bacterial properties in sludge dewatering house were analyzed.•Levels of airborne bacteria and chemicals showed regional variations.•Bacterial population in bioaerosols also presented significant regional disparity.•Common potential pathogens were detected in bioaerosols from all SDHs.•RH and temperature were major parameters on bioaerosols to survive in SDHs. [Display omitted] Municipal wastewater treatment plants (MWTPs) are regarded as sources of airborne microorganisms. Sludge dewatering house (SDH) is one of the most serious indoor bioaerosol pollution treatment sectors in MWTPs. In this study, properties of bioaerosols from SDHs of nine MWTPs were investigated in China. Results suggested that bioaerosols were generated mainly from the mixed liquor and will be promoted by the mechanical motion of belts of dewatering devices. They will accumulate in the SDHs due to the treatment devices placed inside. Levels of airborne bacteria and chemicals showed regional variations. In Hefei and Yixing, the emissions of total suspended particles (TSP) and airborne bacteria were higher than those in Beijing and Guangzhou. Results of bacterial population showed that bacterial species in bioaerosols from SDHs also presented significant regional disparity; these regional disparities were closely related with the source of bioaerosols in SDHs. Among these identified bacterial species, some common potential pathogens were detected in all SDHs, such as Aeromonas caviae, Flavobacterium sp., and Staphylococcus lentus. Relative humidity (RH) and temperature were the major parameters on bioaerosols to survive. As shown in this study, SDHs in wastewater treatment plants should be provided considerable attention for being an emission source of indoor bioaerosols.
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2017.11.071