Characterization, factors, and UV reduction of airborne bacteria in a rural wastewater treatment station

Li, Pengyu; Li, Lin; Wang, Yanjie; Zheng, Tianlong; Liu, Junxin

doi:10.1016/j.scitotenv.2020.141811

Cited by 17 publications

(4 citation statements)

References 42 publications

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“…After UV control, the proportion of 1.1-4.7 μm bioaerosol was relatively high. Combined with the previous studies (Li et al, 2021b), the bioaerosols with larger particle size were easily settled back into BTF systems after inactivation, while bioaerosols in particles <1.1 μm were more easily inactivated by UV. Studies showed that fine particles with a particle size <4.7 μm were more likely to deposit in the respiratory tract and alveoli, especially microbial aerosols that carried pathogenic bacteria and pollutants, which were more harmful to the human body.…”

Section: Particle Size Distributionsupporting

confidence: 61%

“…In this study, due to the natural sedimentation of particles larger than 4.7 μm after inactivation, the proportion of bioaerosols of 3.3-4.7 μm in the outlet from UVB increased, and the single-cell bacterial aerosols of <3.3 μm were dominated in general. Li et al (2021b) found that the overall reduction in coarse particles was greater than fine particles sourced from a rural wastewater treatment station.…”

Section: Particle Size Distributionmentioning

confidence: 90%

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Cyclohexane removal and UV post-control of bioaerosols in a combination of UV pretreatment and biotrickling filtration

Sun

Cheng

Luo

et al. 2022

Front. Environ. Sci.

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Biofiltration of hydrophobic and recalcitrant volatile organic compounds faces challenges, and the bioaerosols sourced from the biofiltration might cause secondary pollution. In this study, the combination of ultraviolet photodegradation and biotrickling filtration (UV-BTF) was designed to treat gaseous cyclohexane, and UV post-treatment (post-UV) was further utilized for the bioaerosol emissions management. Results showed that the combined UV-BTF permitted faster biofilm formation and had better removal efficiencies (REs) than the single biotrickling filter (BTF). The maximum elimination capacity (EC) of UV-BTF and single BTF was 4.4 and 1.32 g m−3 h−1, respectively. Carbon balance for the bioreactor showed that both BTF and UV-BTF could convert more than 50% of the initial cyclohexane into microbial biomass. High-throughput sequencing analysis showed that UV-BTF had a richer and more diverse microbial community compared with the single one. The post-UV had a good inactivation effect on the bioaerosols. Not solely the concentrations additionally the particle sizes of the bioaerosols from the post-UV became lower and smaller than those from the single BTF. Microbial analysis showed that UV had a greater impact on the species and quantity of both bacteria and fungi, but mainly on the number of bacteria. Such results suggested that UV could be used as the pretreatment for the enhancement of hydrophobic and recalcitrant VOCs removal in the subsequent biopurification, and also as the post-treatment for the inactivation of some harmful bioaerosols.

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Section: Particle Size Distributionsupporting

confidence: 61%

Section: Particle Size Distributionmentioning

confidence: 90%

Cyclohexane removal and UV post-control of bioaerosols in a combination of UV pretreatment and biotrickling filtration

Sun

Cheng

Luo

et al. 2022

Front. Environ. Sci.

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“…The bioaerosols of WWTP contain various pathogenic and non-pathogenic substances dispersed in the air (Liu et al 2020). Most bacteria, fungi, and viruses can be detected in bioaerosols of WWTP (Han et al 2019;Li et al 2020a;Uhrbrand et al 2017). Additionally, chemicals such as Cl − , NH 4+ , Ca 2+ , as well as carcinogenic substance (As, Cd, and Co) also existed from bioaerosols (Han et al 2020a;Yang et al 2019b).…”

Section: The Characteristics Of Bioaerosols Of Wwtpmentioning

confidence: 99%

The bioaerosols emitted from toilet and wastewater treatment plant: a literature review

Lou

Liu

et al. 2020

Environ Sci Pollut Res

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The aerosols harboring microorganisms and viruses released from the wastewater system into the air have greatly threatened the health and safety of human beings. The wastewater systems, including toilet and wastewater treatment plant (WWTP), are the major locations of epidemic infections due to the extensive sources of aerosols, as well as multifarious germs and microorganisms. Viruses and microorganisms may transport from both toilet and hospital into municipal pipes and subsequently into WWTP, which accounts for the main source of bioaerosols dispersed in the air of the wastewater system. This review aims to elaborate the generation, transmission, and diffusion processes of bioaerosols at toilet and WWTP. Moreover, the main factors affecting bioaerosol transmission and the corresponding prevention strategies for the airborne and inhaled bioaerosols are also discussed. Collectively, this review highlights the importance of managing bioaerosol occurrence in the wastewater system, which has aroused increasing concern from the public.

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“…Subsequently, laboratory studies performed under controlled conditions, have determined the effectiveness of UV-C for various aerosolized microorganisms [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. Several factors are reported to affect indoor UV-C effectiveness, including UV-C intensity (units: μW/cm 2 ), UV-C dose (intensity × time [s], units: μW s/cm 2 ), the susceptibility of a given microorganisms, photoreactivation, relative humidity (RH), temperature, room air exchange rates, and air mixing [ 26 , 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of Ultraviolet-C (UV-C) Irradiation on the Viability of Airborne Pseudomonas aeruginosa

Nguyen

Carter

et al. 2022

IJERPH

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Pseudomonas aeruginosa (Pa) is the predominant bacterial pathogen in people with cystic fibrosis (CF) and can be transmitted by airborne droplet nuclei. Little is known about the ability of ultraviolet band C (UV-C) irradiation to inactivate Pa at doses and conditions relevant to implementation in indoor clinical settings. We assessed the effectiveness of UV-C (265 nm) at up to seven doses on the decay of nebulized Pa aerosols (clonal Pa strain) under a range of experimental conditions. Experiments were done in a 400 L rotating sampling drum. A six-stage Andersen cascade impactor was used to collect aerosols inside the drum and the particle size distribution was characterized by an optical particle counter. UV-C effectiveness was characterized relative to control tests (no UV-C) of the natural decay of Pa. We performed 112 tests in total across all experimental conditions. The addition of UV-C significantly increased the inactivation of Pa compared with natural decay alone at all but one of the UV-C doses assessed. UV-C doses from 246–1968 µW s/cm2 had an estimated effectiveness of approximately 50–90% for airborne Pa. The effectiveness of doses ≥984 µW s/cm2 were not significantly different from each other (p-values: 0.365 to ~1), consistent with a flattening of effectiveness at higher doses. Modelling showed that delivering the highest dose associated with significant improvement in effectiveness (984 µW s/cm2) to the upper air of three clinical rooms would lead to lower room doses from 37–49% of the 8 h occupational limit. Our results suggest that UV-C can expedite the inactivation of nebulized airborne Pa under controlled conditions, at levels that can be delivered safely in occupied settings. These findings need corroboration, but UV-C may have potential applications in locations where people with CF congregate, coupled with other indoor and administrative infection control measures.

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Characterization, factors, and UV reduction of airborne bacteria in a rural wastewater treatment station

Cited by 17 publications

References 42 publications

Cyclohexane removal and UV post-control of bioaerosols in a combination of UV pretreatment and biotrickling filtration

Cyclohexane removal and UV post-control of bioaerosols in a combination of UV pretreatment and biotrickling filtration

The bioaerosols emitted from toilet and wastewater treatment plant: a literature review

The Effectiveness of Ultraviolet-C (UV-C) Irradiation on the Viability of Airborne Pseudomonas aeruginosa

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