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.
Laboratory of Microbiology, Wageningen University and Research Center, the Netherlands.
Chemosphere. 2020 Jul;251:126359. doi: 10.1016/j.chemosphere.2020.126359. Epub 2020 Feb 28.
Biogas produced at wastewater treatment plants and landfills contains trace levels of volatile methyl siloxanes (VMS) that are responsible for abrasion, corrosion and erosion of equipment during biogas storage and combustion. This research comparatively evaluated the removal of the most common VMS (L2, L3, D4, and D5) under aerobic conditions in a conventional biotrickling filter (BTF) and a two-phase partitioning BTF (TP-BTF) with silicone oil (at 30%) as organic phase. The TP-BTF showed a superior performance compared to the conventional BTF, increasing the total VMS removal from <30% in the BTF up to ∼70% in the TP-BTF. The highest REs in the TP-BTF were recorded for D4 and D5, reaching values of 80-90%, corresponding to ECs between 0.12 and 0.17 g m.h. Slightly lower values were obtained for L3 (70-80%), and the lowest performance was recorded for L2 (20-60%) due to the high vapor pressure of this siloxane and therefore its lower affinity by the organic phase. Surprisingly, despite the different inocula used, a similar microbial community was found by the end of operation of both BTFs, with KMBC-112, Reynarella and Chitinophaga as the dominant genera.
污水处理厂和垃圾填埋场产生的沼气中含有痕量挥发性甲基硅氧烷（VMS），这些 VMS 在沼气储存和燃烧过程中会对设备造成磨损、腐蚀和侵蚀。本研究比较了在有氧条件下，常规生物滴滤器（BTF）和两相分配生物滴滤器（TP-BTF）中最常见的 VMS（L2、L3、D4 和 D5）的去除情况，其中硅胶（30%）作为有机相。与常规 BTF 相比，TP-BTF 表现出更好的性能，将总 VMS 去除率从 BTF 中的<30%提高到 TP-BTF 中的约 70%。在 TP-BTF 中，D4 和 D5 的 RE 最高，达到 80-90%，相应的 EC 值在 0.12 和 0.17 g m.h. S 之间。L3 的去除率略低（70-80%），而 L2 的去除率最低（20-60%），这是由于这种硅氧烷的蒸气压较高，因此对有机相的亲和力较低。令人惊讶的是，尽管使用了不同的接种物，但在两种 BTF 的运行结束时，都发现了相似的微生物群落，优势属为 KMBC-112、雷纳雷拉和几丁质噬菌。
