Wang Chuwen, Liang Wenjun, Liu Jia, Yang Jingsu, Zheng Jiamei
Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China.
Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2025 Aug;430:132580. doi: 10.1016/j.biortech.2025.132580. Epub 2025 Apr 26.
Fillers significantly affect the efficient operation of biotrickling filters (BTFs). Herein, structured polypropylene fillers modified with polydopamine (PDA) and cationic polyacrylamide (CPAM) were developed to reduce pressure loss and shorten the start-up period. Based on thermodynamics and the extended Derjaguin-Landau-Verwey-Overbeek theory, both modified fillers could improve biocompatibility. BTF with CPAM-modified filler had a shorter start-up period than PDA-modified filler. The maximum elimination capacity of the BTFs packed with PDA and CPAM-modified filler was 75.52 g·m·h and 78.62 g·m·h, respectively, at an inlet toluene loading rate of 97.26 g·m·h and an empty bed residence time of 33 s. CPAM-modified filler biofilms exhibited higher adhesion strength and extracellular polymeric substance content during early operation. Furthermore, coating differences affected the microbial community structure on the filler surface. The CPAM-modified filler demonstrated superior performance by enriching toluene-degrading bacteria and upregulating key catabolic genes during the start-up stage.
填料对生物滴滤池（BTF）的高效运行有显著影响。在此，开发了用聚多巴胺（PDA）和阳离子聚丙烯酰胺（CPAM）改性的结构化聚丙烯填料，以降低压力损失并缩短启动周期。基于热力学和扩展的Derjaguin-Landau-Verwey-Overbeek理论，两种改性填料都能提高生物相容性。装有CPAM改性填料的BTF比装有PDA改性填料的BTF启动周期更短。在进口甲苯负荷率为97.26 g·m·h且空床停留时间为33 s的条件下，装有PDA和CPAM改性填料的BTF的最大去除能力分别为75.52 g·m·h和78.62 g·m·h。CPAM改性填料生物膜在运行初期表现出更高的附着强度和胞外聚合物含量。此外，涂层差异影响了填料表面的微生物群落结构。CPAM改性填料在启动阶段通过富集甲苯降解细菌和上调关键分解代谢基因表现出优异的性能。
