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Comparative assessment of two biotrickling filters for siloxanes removal: Effect of the addition of an organic phase.
Chemosphere ( IF 8.1 ) Pub Date : 2020-02-28 , DOI: 10.1016/j.chemosphere.2020.126359
Celia Pascual 1 , Sara Cantera 2 , Raúl Muñoz 1 , Raquel Lebrero 1
Affiliation  

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-3.h-1. 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.

中文翻译:

两种用于去除硅氧烷的生物滴滤器的比较评估:添加有机相的影响。

废水处理厂和垃圾填埋场产生的沼气中含有微量的挥发性甲基硅氧烷(VMS),它们在沼气存储和燃烧过程中会造成设备的磨损,腐蚀和侵蚀。这项研究比较了在有氧条件下,在常规生物滴滤器(BTF)和两相分配BTF(TP-BTF)和硅油(30℃)下,在有氧条件下去除最常见VMS(L2,L3,D4和D5)的能力%)作为有机相。与传统的BTF相比,TP-BTF表现出优越的性能,将VMS的总去除率从BTF中的<30%增加到TP-BTF中的〜70%。记录到TP-BTF中D4和D5的最高RE,达到80-90%的值,对应于EC在0.12和0.17 g m-3.h-1之间。L3的值稍低(70-80%),由于该硅氧烷的蒸气压高,因此其与有机相的亲和力较低,因此L2(20-60%)的性能最低。出人意料的是,尽管使用了不同的接种物,但在两种BTF的操作结束时都发现了相似的微生物群落,其中KMBC-112,Reynarella和Chitinophaga是主要的属。
更新日期:2020-02-28
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