Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100124, China; Beijing Municipal Institute of Labour Protection, Beijing, 100054, China.
Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, 100124, China.
Chemosphere. 2021 Jun;273:129710. doi: 10.1016/j.chemosphere.2021.129710. Epub 2021 Jan 22.
Bio-trickling filters (BTFs) can be used to remediate pollution by volatile organic compounds such as toluene. To investigate the effect of filler voidage on pressure drop (△P), two parallel BTFs were constructed using ceramsite with different voidages (47.5% for BTF1 and 55% for BTF2) and inoculated with Fusarium fungus to purify toluene. Commutation and stagnation operations were explored as ways to relieve △P. In BTF1, commutation temporarily relieved △P and maintained it for 7 days. Implementing stagnation on the 178th day for 69 days effectively reduced the △P from 720 Pa/m to below 20 Pa/m, which was maintained for 36 days. Compared with BTF1, the filler in BTF2 effectively delayed the increase in △P for 70 days or more and ensured stable operation for as long as 174 days. High-throughput sequencing revealed that Fusarium was mainly replaced by Protoctista, Fronsecaea and other fungi in both BTFs, although there were significant differences in their microbial communities. The influences of commutation and stagnation operations on fungal evolution were more obvious in BTF2, in relation to both time and space. The results provide guidance for designing better BTFs to treat hazardous pollutants.
生物滴滤塔（BTFs）可用于修复甲苯等挥发性有机化合物污染。为了研究填料空隙率对压降（△P）的影响，使用空隙率不同的陶粒（BTF1 为 47.5%，BTF2 为 55%）构建了两个平行的 BTF，并接种了木霉真菌来净化甲苯。本文探讨了换向和停流操作缓解△P 的效果。在 BTF1 中，换向可暂时缓解△P 并维持 7 天。第 178 天停流 69 天可有效将△P 从 720 Pa/m 降低至 20 Pa/m 以下，并维持 36 天。与 BTF1 相比，BTF2 中的填料有效延迟了△P 的增加 70 天或更长时间，并确保了长达 174 天的稳定运行。高通量测序结果显示，尽管两 BTF 中的微生物群落存在显著差异，但木霉主要被原生动物、拟青霉等真菌所取代。换向和停流操作对真菌进化的影响在 BTF2 中更为明显，无论是在时间还是空间上。本研究结果为设计更好的 BTF 来处理有害污染物提供了指导。
