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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摘要以传统中气泡和小气泡曝气为对比,研究了微纳米气泡曝气过程溶氧效率、微生物气溶胶逸散特性及暴露风险.结果表明,微纳米气泡曝气的氧传质系数为K_La=1.96min^-1,分别是传统中气泡和小气泡曝气方式的9.33倍和2.88倍;相比于传统气泡曝气,微纳米气泡曝气过程产生的微生物气溶胶逸散总量下降了38.53%,且微生物气溶胶空间逸散特性存在差异;暴露风险评估结果显示,微纳米气泡曝气产生微生物气溶胶的非致癌风险指数HI<1,整体非致癌风险较小,但该过程产生的微生物气溶胶颗粒粒径主要处于3~5级,在实际生产中操作人员吸入微生物气溶胶造成的致病菌传播风险仍不容忽视.

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	张志强
	李渴欣
	李瑾
	孔德萍
	胡肖立杨
	卢金锁

关键词 ：微纳米气泡, 曝气, 微生物气溶胶, 逸散特性, 暴露风险

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

收稿日期: 2023-01-04

PACS:	X172
	X153

基金资助:国家自然科学基金项目(52000146)；中国博士后科学基金面上项目(2020M673351)；哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金项目(HC202245)

通讯作者: 卢金锁,教授,lujinsuo@xauat.edu.cn E-mail: lujinsuo@xauat.edu.cn

作者简介: 张志强(1988-),男,黑龙江拜泉人,副教授,博士,主要从事城镇排水系统运行风险识别与控制研究.发表论文30余篇.zzq@xauat.edu.cn

引用本文:

张志强, 李渴欣, 李瑾, 孔德萍, 胡肖立杨, 卢金锁. 微纳米气泡曝气微生物气溶胶逸散特性及风险评估[J]. 中国环境科学, 2023, 43(8): 4202-4210. ZHANG Zhi-qiang, LI Ke-xin, LI Jin, KONG De-ping, HU Xiao-Li-yang, LU Jin-suo. Characteristics and risk assessment of the bioaerosols emitted from micro-nano bubble aeration process. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4202-4210.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I8/4202

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