Bioaerosols emission characteristics from wastewater treatment aeration tanks and associated health risk exposure assessment during autumn and winter.
Bioaerosols emission characteristics from wastewater treatment aeration tanks and associated health risk exposure assessment during autumn and winter.
复制标题
秋冬季节污水处理曝气池生物气溶胶排放特征及相关健康风险暴露评估。
DOI：
10.1016/j.scitotenv.2022.158106
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Zhao XY
中科院分区：
文献类型：
--
作者：
Zhao XY
活性污泥废水处理厂的曝气池会释放出大量的生物气溶胶，对人体健康构成威胁。然而，废水处理厂排放的生物气溶胶的风险特征目前没有系统地进行，而且仍处于起步阶段。因此，本研究对某城市污水处理厂曝气池排放的两种指示型生物气溶胶金黄色葡萄球菌和大肠杆菌的排放特性进行了研究。采用蒙特卡罗模拟定量评价了乐观和保守两种曝气方式对微生物风险的影响。此外，在秋季和冬季为期3天的采样活动中考虑了两种不同的暴露情景。结果表明，微孔曝气池的生物气溶胶浓度（20 ~ 262 CFU m−3）比转盘式曝气池低一个数量级。机械曝气方式的平均雾化速率提高了7.5倍。冬季暴露人群的健康风险比秋季高0.4倍和9.6倍。coliandS。分别aureusbioaerosol。工作人员的健康风险比访问学者高10倍。没有个人防护装备（PPE）的学术访问者分别暴露于toS，观察到有趣的结果。aureusandE。在乐观估计下，导出的感染风险达到美国环境保护署（U.S. EPA）的基准，而在保守估计下，疾病风险负担超过世界卫生组织（WHO）的基准。这些结果表明，仅满足两个基准中的一个并不意味着健康风险是绝对可接受的。本研究有助于更好地理解生物气溶胶风险特征的定量评估和相应的废水公用事业风险控制策略。
Aeration 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 andEscherichia 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 forE. coliandS. aureusbioaerosol, 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 toS. aureusandE. colibioaerosol 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.