Bioaerosols emission characteristics from wastewater treatment aeration tanks and associated health risk exposure assessment during autumn and winter

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dc.contributor.authorZhao, Xiao-yan
dc.contributor.authorAn, Dong-zi
dc.contributor.authorLiu, Man-li
dc.contributor.authorMa, Jia-xin
dc.contributor.authorAli, Wajid
dc.contributor.authorZhu, Hao
dc.contributor.authorLi, Ming
dc.contributor.authorAi, Xiao-jun
dc.contributor.authorNasir, Zaheer Ahmad
dc.contributor.authorGarcia Alcega, Sonia
dc.contributor.authorCoulon, Frederic
dc.contributor.authorYan, Cheng
dc.date.accessioned2022-08-31T13:15:30Z
dc.date.available2022-08-31T13:15:30Z
dc.date.issued2022-08-22
dc.description.abstractAeration tanks from activated sludge wastewater treatment plants (WWTPs) can release a large amount of bioaerosols that can pose health risks. However, risk characterization of bioaerosols emissions form wastewater treatment plants is currently not systematically carried out and still in its infancy. Therefore, this study investigated emission characteristic of two indicator model bioaerosols Staphylococcus aureus and Escherichia coli, emitted from aeration tanks of a municipal WWTP. Monte Carlo simulation was then used to quantitatively assess microbial risk posed by different aeration modes under optimistic and conservative estimates. Further to this, two different exposure scenarios were considered during 3 days sampling campaign in autumn and winter. Results showed that the bioaerosol concentration from microporous aeration tank (20–262 CFU m−3) was one order of magnitude lower than rotating disc aeration tank. Average aerosolization rate was 7.5 times higher with mechanical aeration mode. Health risks of exposed populations were 0.4 and 9.6 times higher in winter than in autumn for E. coli and S. aureus bioaerosol, respectively. Health risks of staff members were 10 times higher than academic visitors. Interesting results were observed for academic visitors without personal protective equipment (PPE) respectively exposed to S. aureus and E. coli bioaerosol in autumn and winter: while the derived infection risk met the United States Environmental Protection Agency (U.S. EPA) benchmark under optimistic estimation, the disease risk burden was over the World Health Organization (WHO) benchmark under conservative estimation. These revealed that only satisfying one of the two benchmarks didn't mean absolute acceptable health risk. This study could facilitate the development of better understanding of bioaerosol quantitative assessment of risk characterizations and corresponding appropriate risk control strategies for wastewater utilities.en_UK
dc.identifier.citationZhao XY, An DZ, Liu ML, et al., (2022) Bioaerosols emission characteristics from wastewater treatment aeration tanks and associated health risk exposure assessment during autumn and winter. Science of the Total Environment, Volume 851, Pt 1, December 2022, Article number 158106en_UK
dc.identifier.issn0048-9697
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2022.158106
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18388
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectQuantitative microbial risk assessmenten_UK
dc.subjectAnnual infection risken_UK
dc.subjectDisease burdenen_UK
dc.subjectAerosolization ratioen_UK
dc.subjectWastewater treatment plantsen_UK
dc.subjectBioaerosolsen_UK
dc.titleBioaerosols emission characteristics from wastewater treatment aeration tanks and associated health risk exposure assessment during autumn and winteren_UK
dc.typeArticleen_UK

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