Research Group EnVOC, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.
X-ray Microspectroscopy & Imaging Group XMI, Faculty of Sciences, Ghent University, Krijgslaan 281 S12, 9000, Ghent, Belgium.
Chemosphere. 2020 Aug;253:126684. doi: 10.1016/j.chemosphere.2020.126684. Epub 2020 Apr 6.
The use of Fusarium solani fungi in an expanded perlite packed biofilter was investigated for the treatment of a hexane polluted waste gas stream using selected ion flow tube mass spectrometry (SIFT-MS). The latter analytical technique proved to be of utmost importance to evaluate the performance of the biofilter at high time resolution (seconds) under various transient conditions, analogous to industrial situations. The biofilter was operational for 277 days with inlet loads varying between 1 and 14 g m h and applying an empty bed residence time of 116 s. The results showed a positive behaviour of the biofilter against different types of disruptions such as: (i) changes in the relative humidity of the inlet gas, (ii) stopping the carbon supply for 1, 5 and 10 days, (iii) varying the inlet hexane concentration (step increases and intermittent pulses) and (iv) limiting the availability of nutrients. X-ray imaging (both conventional 2D μCT and X-ray fluorescence, XRF) was applied for the first time on biofilter media in order to get insight in the internal structure of expanded perlite and to visualise the biomass growth. The latter in combination with online porosity measurements using SIFT-MS provides fundamental information regarding the biofiltration process.
利用扩展珍珠岩填充生物滤池中的尖孢镰刀菌真菌，采用选择离子流管质谱（SIFT-MS）研究了处理己烷污染废气的方法。后一种分析技术被证明对于在各种瞬态条件下（类似于工业情况）以高时间分辨率（秒）评估生物滤池的性能非常重要。生物滤池运行了 277 天，入口负荷在 1 到 14 g m h 之间变化，采用的空床停留时间为 116 s。结果表明，生物滤池对不同类型的干扰具有积极的作用，例如：（i）进气相对湿度的变化，（ii）停止碳供应 1、5 和 10 天，（iii）改变入口己烷浓度（逐步增加和间歇性脉冲），以及（iv）限制养分的可用性。X 射线成像（包括传统的二维 μCT 和 X 射线荧光，XRF）首次应用于生物滤池介质，以便深入了解扩展珍珠岩的内部结构并可视化生物量的生长。后者与使用 SIFT-MS 进行的在线孔隙率测量相结合，为生物过滤过程提供了基本信息。
