Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid, 47011, Spain; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid, 47011, Spain.
Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n., Valladolid, 47011, Spain; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid, 47011, Spain.
J Environ Manage. 2024 Nov;370:122862. doi: 10.1016/j.jenvman.2024.122862. Epub 2024 Oct 14.
Siloxanes (VMS) represent a class of organosilicon compounds known for their adverse effects on both the environment and human health. Their presence in biogas significantly hinders its economic valorisation, highlighting the need for effective treatment methods. This study investigates the performance of three different packing materials in the anoxic biofiltration of VMS (L2, L3, D4 and D5). The materials evaluated included plastic rings (BTF-1), polyurethane foam (BTF-2) and plastic rings combined with activated carbon (80:20) (BTF-3). Among them, BTF-3 exhibited superior performance, achieving maximum VMS removal efficiencies (REs) of 90%, including the complete elimination of L3 and D4, and ∼80% removal of D5, attributed to the presence of activated carbon. However, the abatement of L2 was inferior to that of other VMS (<80%), which was attributed to the activated carbon's affinity for larger molecular weights and critical diameters. In contrast, BTF-1 and BTF-2 supported maximum VMS removals of 40%. Notably, neither increasing the trickling liquid velocity from 2 to 4.5 m h⁻ nor adding Fe-carbon nanoparticles to the solution had any impact on the BTFs' performance. Following the successful results observed in BTF-3, gas residence time was reduced from 60 to 42 min, consequently leading to an increase in the EC from 366 to 509 mg m h (corresponding to an RE = 87%). Despite the different performance of the BTFs, comparable bacterial communities were identified, dominated by the genera Thermomonas, Corynebacterium, Aquimonas, Thauera and Parvibaculum. The results obtained in this study highlighted the potential of activated carbon as packing material for enhancing abatement performance during biotrickling filtration and identified new bacterial genera with potential for VMS degradation.
硅氧烷（VMS）是一类有机硅化合物，已知它们对环境和人类健康都有不良影响。它们在沼气中的存在极大地阻碍了其经济价值的实现，这凸显了需要有效的处理方法。本研究考察了三种不同包装材料在 VMS 的缺氧生物过滤中的性能（L2、L3、D4 和 D5）。评估的材料包括塑料环（BTF-1）、聚氨酯泡沫（BTF-2）和塑料环与活性炭（80:20）的组合（BTF-3）。其中，BTF-3 表现出优异的性能，最大 VMS 去除效率（RE）达到 90%，包括 L3 和 D4 的完全消除，以及 D5 的约 80%去除，这归因于活性炭的存在。然而，L2 的去除率不如其他 VMS（<80%），这归因于活性炭对较大分子量和临界直径的亲和力。相比之下，BTF-1 和 BTF-2 支持的 VMS 去除率最大为 40%。值得注意的是，无论是将滴滤液速度从 2 增加到 4.5 m h⁻¹还是在溶液中添加 Fe-碳纳米颗粒，都没有对 BTF 的性能产生任何影响。在 BTF-3 观察到成功结果后，将气体停留时间从 60 减少到 42 分钟，从而导致 EC 从 366 增加到 509 mg m h（对应 RE=87%）。尽管 BTF 的性能不同，但鉴定出了具有可比性的细菌群落，主要由 Thermomonas、Corynebacterium、Aquimonas、Thauera 和 Parvibaculum 属主导。本研究结果强调了活性炭作为包装材料在生物滴滤过滤中增强去除性能的潜力，并确定了具有 VMS 降解潜力的新细菌属。
