Effects of aeration on microbes and intestinal bacteria in bioaerosols from the BRT of an indoor wastewater treatment facility

The generation and emission of airborne bacteria from a biochemical reaction tank (BRT) for wastewater treatment was investigated by altering the aeration rate. The levels of bioaerosols increased from 715 ± 69 to 1597 ± 135 CFU/m3 (total airborne bacteria) and from 78 ± 6 to 359 ± 18 CFU/m3 (intest...

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Veröffentlicht in:The Science of the total environment Jg. 648; S. 1453 - 1461
Hauptverfasser: Wang, Yanjie, Li, Lin, Xiong, Ren, Guo, Xuesong, Liu, Junxin
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier B.V 15.01.2019
Schlagworte:
adults
aeration
Aeration rate
air
airborne microorganisms
Bioaerosols
breathing
Brevundimonas
Chryseobacterium
Citrobacter
females
high-throughput nucleotide sequencing
intestinal microorganisms
males
Micrococcaceae
occupational health and safety
Particle size
particle size distribution
people
population structure
Risk assessment
Source apportionment
wastewater treatment
Yersinia
Particle size
Aeration rate
Source apportionment
Risk assessment
Bioaerosols
ISSN:0048-9697, 1879-1026, 1879-1026
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Zusammenfassung:The generation and emission of airborne bacteria from a biochemical reaction tank (BRT) for wastewater treatment was investigated by altering the aeration rate. The levels of bioaerosols increased from 715 ± 69 to 1597 ± 135 CFU/m3 (total airborne bacteria) and from 78 ± 6 to 359 ± 18 CFU/m3 (intestinal bacteria) as the aeration rate increased from 0.3 to 1.2 m3/h. Most airborne bacteria were attached to particles smaller than 4.7 μm at an aeration rate of 0.3 m3/h. They were found attached to larger particles (>4.7 μm) when the aeration rate increased to 1.2 m3/h. A similar phenomenon was observed for intestinal bacteria. The high-throughput sequencing technique was used to assay the microbial populations of the bioaerosols. Both microbial counts and diversity increased as the aeration rate increased. Brevundimonas (63.82%), Chryseobacterium (16.54%), and Micrococcaceae (12.37%) were the dominant intestinal bacteria at an aeration rate of 0.3 m3/h. Pseudochrobactrum (33.10%), Citrobacter (21.28%), and Yersinia (18.21%) were the dominant intestinal bacteria at an aeration rate of 1.2 m3/h. The level, particle size distribution, population structure, and diversity of the bioaerosols were all affected by aeration rate. The source tracker results indicated that water and the surrounding air were the two main bioaerosol sources. The contribution of water is greater at larger levels of aeration. Inhalation was the main pathway of microbial aerosol intake for people in the surrounding area. The exposure hazard quotients for adult males were generally higher than those for adult females. Necessary measures should be taken to ensure worker safety. [Display omitted] •Generation and emission of airborne bacteria during microporous aeration•Source tracker indicated water and ambient air were sources of airborne bacteria.•Microbial counts and diversity increased as the aeration rate accelerated.•Intestinal bacteria presented in the bioaerosols.•Health risks of intestinal bacteria in bioaerosols are greater than general bacteria.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2018.08.244