Tianjin Key Lab of Indoor Air Environmental Quality Control, Tianjin, PR China; School of Environmental Science and Engineering, Tianjin University, Tianjin, PR China; School of Civil and Environmental Engineering, Georgia Institute of Technology, GA, USA.
Tianjin Key Lab of Indoor Air Environmental Quality Control, Tianjin, PR China; School of Environmental Science and Engineering, Tianjin University, Tianjin, PR China.
J Hazard Mater. 2020 Jul 15;394:122535. doi: 10.1016/j.jhazmat.2020.122535. Epub 2020 Mar 13.
Antibiotic resistance genes (ARGs) have been detected in the atmosphere. Airborne ARGs transmission threatens human health. In the present study, we investigated the release and degradation of airborne ARGs from Escherichia coli bioaerosol through microwave (MW) irradiation. In this study, a new MW absorbing material (FeO@SiC ceramic foam) that contributed to its stronger MW absorption is presented. When the MW input energy density was 7.4 × 10 kJ/m, the concentration of airborne Escherichia coli decreased by 4.4 log. Different DNA forms were found in the air because MW irradiation ruptured cell membranes. The bound particles provide more protection for bound DNA in the degradation process than free DNA. After the self-degradation of the released airborne free ARGs, some of them would remain and continue to spread in the atmosphere. The released airborne free ARGs cannot be ignored. Total ARGs concentrations decrease rapidly with increased temperature. The inactivation rate constant of ARGs through MW irradiation is higher than that through the Fenton and UV, however, the energy efficiency per order of MW irradiation is lower. Therefore, MW irradiation with FeO@SiC ceramic foam could efficiently degrade the distribution of ARGs in the atmosphere.
抗生素耐药基因（ARGs）已在大气中检测到。空气传播的 ARGs 传播威胁着人类健康。在本研究中，我们通过微波（MW）照射研究了大肠杆菌生物气溶胶中空气传播 ARGs 的释放和降解。在本研究中，提出了一种新的 MW 吸收材料（FeO@SiC 陶瓷泡沫），它有助于增强 MW 吸收。当 MW 输入能量密度为 7.4×10 kJ/m 时，空气中大肠杆菌的浓度降低了 4.4 个对数。由于 MW 照射破坏了细胞膜，空气中发现了不同形式的 DNA。结合颗粒在降解过程中为结合 DNA 提供了比游离 DNA 更多的保护。释放的空气中游离 ARGs 自我降解后，其中一些会残留在大气中继续传播。释放的空气中游离 ARGs 不容忽视。随着温度的升高，总 ARGs 浓度迅速下降。通过 MW 照射的 ARGs 失活率常数高于芬顿和 UV，但 MW 照射的每阶能量效率较低。因此，用 FeO@SiC 陶瓷泡沫进行 MW 照射可以有效地降解大气中 ARGs 的分布。
