The study of bioaerosol dispersion in wastewater treatment plants (WWTPs) has received considerable attention. This study aimed to investigate the seasonal changes and spatial distributions of airborne bacteria around different parts of Ahvaz WWTP, the capital city of Khuzestan Province, Iran, over 4 months in the cold and warm seasons. Samples were collected from 2 and 10-m intervals of grit chamber (GCh), primary sludge dewatering basin (PSDB), aeration tank (AT), as well as 60-m upstream (US) and downstream (DS) of the WWTP. Further, bacteria in the indoor air of administrative building (AB) of WWTP were investigated. Bioaerosols were collected by passive sampling method. The total bacteria count was 105.3 ± 98.5 CFU/plate/h. The dominant bacteria stood 2 m away from the AT with an average 244.2 ± 73.1 CFU/plate/h in the warm season while they were the lowest with an average 43 ± 11.4 CFU/plate/h in the 10-m distance of the GCh in the cold season. According to the sequencing results, the dominant bacterial species included Bacillus pumilus (26.7%), Staphylococcus arlettae (23.2%), Kocuria turfanensis (13.6%) and Alicycliphilus (9.2%), respectively. There was a positive relationship between the release of bacteria, temperature and wind speed. However, there was a significant negative correlation between total bacteria concentration and humidity. There are accumulative perils to WWTP workers and neighbors exposed by persistent exposure to airborne bacteria. Therefore, AT should be paid more attention as a dominant source of airborne bacteria emissions, especially in the warm season.

废水处理厂（WWTP）中生物气溶胶分散的研究已受到相当多的关注。这项研究旨在调查在寒冷和温暖的季节中，伊朗胡克斯坦斯坦省首府阿瓦士污水处理厂不同部分周围空气传播细菌的季节变化和空间分布。样品从沉砂池2和10米的间隔（GCH），初级污泥脱水盆（PSDB），曝气池（AT），以及60收集-在污水处理厂的上游（美国）和下游（DS）。此外，对污水处理厂行政大楼（AB）的室内空气中的细菌进行了调查。采用被动采样法收集生物气溶胶。细菌总数为105.3±98.5 CFU /板/小时。在温暖季节，优势细菌与AT的距离为2 m，平均为244.2±73.1 CFU /板/ h，而在GCh的10 m距离内，它们是最低的，平均为43±11.4 CFU /板/ h。在寒冷的季节。根据测序结果，主要细菌种类包括短小芽孢杆菌（Bacillus pumilus）（26.7％），水葡萄球菌（Staphylococcus arlettae）（23.2％），Turcurensis Kocuria（13.6％）和Alicycliphilu。s（9.2％）。细菌的释放，温度和风速之间存在正相关关系。但是，总细菌浓度和湿度之间存在显着的负相关。污水处理厂工人和邻居不断暴露于空气传播的细菌中会累积危险。因此，作为空中传播细菌排放的主要来源，应引起更多关注，特别是在温暖季节。