Xu Renze, Wu Fan, Shen Lian, Fan Zhiqiang, Yu Jianci, Huang Zhen
School of Civil Engineering, Changsha University, Changsha, 410022, Hunan, China.
Key Laboratory of Traffic Safety on Track, School of Traffic & Transportation Engineering, Ministry of Education, Central South University, Changsha, 410075, Hunan, China.
Sci Rep. 2024 Sep 27;14(1):22082. doi: 10.1038/s41598-024-73933-4.
Bioaerosols in public transportation systems raise critical environmental concerns, seriously threatening passenger health and safety. In this study, we investigate the spread characteristics of bioaerosols in a standard type-B subway compartment using both air sampling and sediment sampling methods. Additionally, without compromising indoor passenger comfort, two self-designed air purification devices, based on intense field dielectric (IFD) and dielectric barrier discharge (DBD) technologies, respectively, are successfully applied for the improvement of the subway air quality. The results show that bioaerosols can propagate rapidly throughout the entire compartment in 5 min via airborne transmission. Under the effect of the symmetric air ducts and compartment structure, the difference in bioaerosol concentration in the air is less than 10% between both ends of the compartment. Concurrent substantial bioaerosol deposition on the ground, seats, and windows underscores the risk of contact transmission. Furthermore, the real-time purification rates of the two devices integrated into the air conditioning system reach 59.40% and 44.98%, respectively. With their demonstrated high efficiency in purifying bioaerosols and modular design featuring low energy consumption, easy cleaning, and reusability, these devices stand out as viable long-term solutions for large traffic vehicles. These research findings provide practical equipment recommendations and installation strategies for optimizing indoor air quality in subways and are applicable to other similar transportation systems.
公共交通系统中的生物气溶胶引发了严重的环境问题，严重威胁乘客的健康和安全。在本研究中，我们采用空气采样和沉积物采样方法，研究了标准B型地铁车厢内生物气溶胶的传播特性。此外，在不影响车内乘客舒适度的情况下，分别基于强场电介质（IFD）和介质阻挡放电（DBD）技术成功应用了两种自行设计的空气净化装置，以改善地铁空气质量。结果表明，生物气溶胶可通过空气传播在5分钟内迅速扩散至整个车厢。在对称风道和车厢结构的作用下，车厢两端空气中生物气溶胶浓度差异小于10%。同时，大量生物气溶胶沉积在地面、座椅和窗户上，凸显了接触传播的风险。此外，集成到空调系统中的两种装置的实时净化率分别达到59.40%和44.98%。这些装置在净化生物气溶胶方面表现出高效性，且具有模块化设计，具有低能耗、易于清洁和可重复使用的特点，是大型交通工具可行的长期解决方案。这些研究结果为优化地铁室内空气质量提供了实用的设备建议和安装策略，适用于其他类似的交通系统。
