微纳米气泡曝气微生物气溶胶逸散特性及风险评估

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Abstract The oxygen dissolving efficiencies, bioaerosol emission characteristics and exposure risk of micro-nano bubble aeration were studied in comparison to the traditional medium/fine bubble aeration. The oxygen mass transfer coefficient (K_La) of micro-nano bubble aeration was up to 1.96 min^-1, which was 9.33 and 2.88 times higher than that of traditional medium/small bubble aeration, respectively. Compared to the traditional aeration, the total concentration of bioaerosol emission during micro-nano bubble aeration process decreased by 38.53%, and the spatial dispersion characteristics of bioaerosol were different. The exposure risk assessment results show that the non-carcinogenic risk index (HI) of the bioaerosol produced from micro-nano bubble aeration was less than 1, indicating the non-carcinogenic risk was ignorable. However, the particle size of the bioaerosol ranged in 3~5 level. Therefore, the risk of pathogen transmission caused by inhalation of microbial aerosols by operators during actual production should not be overlooked.

Key words： micro-nano bubbles aeration bioaerosols emission characteristics risk assessment

Received: 04 January 2023

PACS:	X172
	X153

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	Articles by authors
	ZHANG Zhi-qiang
	LI Ke-xin
	LI Jin
	KONG De-ping
	HU Xiao-Li-yang
	LU Jin-suo

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ZHANG Zhi-qiang,LI Ke-xin,LI Jin等. Characteristics and risk assessment of the bioaerosols emitted from micro-nano bubble aeration process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4202-4210.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4202

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