Research Group EnVOC, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium; Department of Chemical Engineering and Food Technology, Vine and Agri-Food Research Institute (IVAGRO), University of Cadiz, Pol. Río San Pedro s/n, Puerto Real, 11510, Spain.
Research Group EnVOC, Department of Green Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium.
Chemosphere. 2020 Sep;254:126738. doi: 10.1016/j.chemosphere.2020.126738. Epub 2020 Apr 17.
Biofiltration is a typical air pollution control process for the treatment of volatile organic compounds (VOCs). Mass transfer of hydrophobic VOCs to the biofilm is limited which leads to low removal efficiency (RE). Aiming to enhance the transport of hydrophobic VOCs, the effect of hydrophobic fumed silica (HFS) addition to a biofilter (BF) for pentane removal was studied in this paper. The effect of HFS on pentane removal was evaluated by daily RE measurements and periodical headspace gas pentane pulse injections using SIFT-MS as analysis apparatus. The BF was operated during more than 100 days at an empty bed residence time (EBRT) of 120 s reaching an elimination capacity (EC) up to 93.8 g pentane m h. At the last stage of the study, when a higher nutrient pulse and HFS to a concentration of 1.5% w/w wet were added, the BF showed better EC (46.3 ± 14.9 g pentane m h; RE = 96.2%) compared to the previous stages (28.3 ± 4.4 g pentane m h; RE = 68.3%). This overall performance improvement was in line with the short peak perturbation experiments carried out during the operational time which demonstrated, by net retention time (NRT) determination, to be a fast and reliable tool to gain insights into the behaviour of pollutants inside the BF and its state. Pentane demonstrated to have larger interactions with the packing material when HFS was added. NRT/EBRT ratio variated along the whole operational time, being larger at the last stage.
生物过滤是一种典型的空气污染控制工艺，用于处理挥发性有机化合物（VOCs）。疏水性 VOCs 向生物膜的质量转移受到限制，导致去除效率（RE）较低。为了增强疏水性 VOCs 的传输，本文研究了在生物过滤器（BF）中添加疏水性气相法二氧化硅（HFS）对戊烷去除的影响。通过使用 SIFT-MS 作为分析仪器进行每日 RE 测量和定期气相戊烷脉冲注入，评估了 HFS 对戊烷去除的影响。BF 在 120s 的空床停留时间（EBRT）下运行超过 100 天，达到高达 93.8g 戊烷 m h 的去除能力（EC）。在研究的最后阶段，当添加更高的营养脉冲和浓度为 1.5%w/w 湿的 HFS 时，BF 显示出更好的 EC（46.3±14.9g 戊烷 m h；RE=96.2%）与前几个阶段相比（28.3±4.4g 戊烷 m h；RE=68.3%）。这种整体性能的提高与操作过程中进行的短期峰扰实验一致，通过净保留时间（NRT）的确定，该实验被证明是一种快速可靠的工具，可以深入了解 BF 内污染物的行为及其状态。当添加 HFS 时，戊烷与填充材料的相互作用更大。NRT/EBRT 比值沿整个操作时间变化，最后阶段较大。
