Hajizadeh Yaghoub, Jafari Negar, Mokhtari Mehdi, Mohammadi Amir, Momtaz Seyed Mojtaba, Fanaei Farzad, Abdolahnejad Ali
Department of Environmental Health Engineering, Faculty of Health, Environmental Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran.
Environmental Science and Technology Research Center, Department of Environmental Health Engineering, Faculty of Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
MethodsX. 2020 Jul 10;7:100991. doi: 10.1016/j.mex.2020.100991. eCollection 2020.
Hydrophobic volatile organic compounds (VOCs) such as n-hexane are not completely biodegradable by a single biofilter. So, in the present study, a photoreactor system packed with scoria granules coated with TiO, as a pretreatment unit, was used for increasing the removal efficiency of n-hexane by a biofilter during an operation period of 191 days. The inlet and outlet concentration of n-hexane was analyzed with a gas chromatography coupled with a flame ionization detector (GC/FID). The results indicated that the removal efficiency of the single biofilter with input concentrations of 0.18 - 1 g/m at empty bed residence times (EBRTs) of 30, 60, and 120 s was 10.06%, 21.45%, and 46.8%, respectively. When the photoreactor was used as a pretreatment system, the removal efficiency of the combined system in corresponding EBRTs was improved to 39.79%, 63.08%, and 92.60%, respectively. The results proved that the combined system provided higher removal efficiencies than the single biofilter. Thus, the application of the photoreactor as a pretreatment step was much effective in increasing the removal efficiency of n-hexane from the polluted air by the biofilter.
疏水性挥发性有机化合物（VOCs），如正己烷，不能被单一生物滤池完全生物降解。因此，在本研究中，一个填充有涂覆TiO₂的火山渣颗粒的光反应器系统作为预处理单元，用于在191天的运行期内提高生物滤池对正己烷的去除效率。使用配有火焰离子化检测器（GC/FID）的气相色谱仪分析正己烷的进出口浓度。结果表明，在空床停留时间（EBRTs）为30、60和120秒时，输入浓度为0.18 - 1 g/m³的单一生物滤池的去除效率分别为10.06%、21.45%和46.8%。当光反应器用作预处理系统时，组合系统在相应EBRTs下的去除效率分别提高到39.79%、63.08%和92.60%。结果证明，组合系统比单一生物滤池具有更高的去除效率。因此，将光反应器作为预处理步骤在提高生物滤池从污染空气中去除正己烷的效率方面非常有效。
