Liu Jia, Ji Qianzhu, Li Ping, Sun Shiyu, Liang Wenjun
Key Laboratory of Beijing On Regional Air Pollution Control, Beijing University of Technology, Beijing, 100124, China.
Bioprocess Biosyst Eng. 2025 Feb;48(2):193-207. doi: 10.1007/s00449-024-03101-5. Epub 2024 Nov 1.
Immobilized fillers have been increasingly utilized in biotrickling filters (BTFs) due to their positive impact on shock load resistance and recovery performance. However, due to the inherent characteristics of its immobilized carrier, the immobilized filler is prone to swelling during the long-term operation of the system, resulting in increased pressure drop. Polyurethane (PU) sponge was used as the cross-linked skeleton of immobilized filler and compared with direct emulsified cross-linked immobilized filler for treating ethylbenzene gas. In the early stage, both fillers can maintain good performance despite changes in the inlet concentration and short-term stagnation. However, on the 107th day of operation, the immobilized filler experienced swelling, and the pressure drop sharply increased to 137.2 Pa, while the PU immobilized filler was still able to maintain a low-pressure drop level. The results of the microbial diversity analysis revealed that the microbial community structure of PU immobilized fillers remained relatively stable when responding to the fluctuations in operating conditions. PU sponges as the skeleton can effectively prolong the service life of the immobilized filler and improve the performance of the biotrickling filter.
由于固定化填料对耐冲击负荷和恢复性能有积极影响，其在生物滴滤器（BTF）中的应用越来越广泛。然而，由于其固定化载体的固有特性，在系统长期运行过程中，固定化填料容易发生膨胀，导致压降增加。以聚氨酯（PU）海绵作为固定化填料的交联骨架，并与直接乳化交联固定化填料用于处理乙苯气体进行比较。在运行初期，尽管进气浓度发生变化和短期停滞，两种填料都能保持良好性能。然而，在运行第107天时，固定化填料出现膨胀，压降急剧增加至137.2 Pa，而PU固定化填料仍能保持较低的压降水平。微生物多样性分析结果表明，PU固定化填料的微生物群落结构在应对运行条件波动时保持相对稳定。以PU海绵为骨架可有效延长固定化填料的使用寿命，提高生物滴滤器的性能。
