Simultaneous removal of siloxanes and H2S from biogas using an aerobic biotrickling filter.,Journal of Hazardous Materials

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Simultaneous removal of siloxanes and H2S from biogas using an aerobic biotrickling filter.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-24 , DOI: 10.1016/j.jhazmat.2020.122187
Yuyao Zhang ₁ , Kazuyuki Oshita ₁ , Taketoshi Kusakabe ₁ , Masaki Takaoka ₁ , Yu Kawasaki ₂ , Daisuke Minami ₂ , Toshihiro Tanaka ₂

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The feasibility of simultaneous removal of siloxane and H2S from biogas was investigated using an aerobic biotrickling filter (BTF). The biodegradation of H2S in the BTF followed a first-order kinetic model and more than 95 % H2S was eliminated within a residence time of 0.3 min. The removal of decamethylcyclopentasiloxane (D5) increased with longer empty bed residence time (EBRT). The partition test and microbial community analysis further reveals that up to 52 % removal of D5 was reached mainly by the chemical-absorption in acid recycling liquid. Finally, D5 was converted into mixtures of dimethylsilanediol (DMSD) and hexamethyldisiloxane (L2) via ring-opening hydrolysis in acid liquid and ring-shrinking polyreaction using CH4 derived from biogas. These operational characteristics demonstrate that the abiotic removal of D5, in addition to biological removal of H2S in an aerobic BTF can significantly decrease the siloxane loading to the downstream siloxane removing units.

中文翻译：

使用好氧生物滴滤池同时去除沼气中的硅氧烷和H2S。

使用好氧生物滴滤池（BTF）研究了从沼气中同时去除硅氧烷和H2S的可行性。BTF中H2S的生物降解遵循一级动力学模型，在0.3分钟的停留时间内消除了95％以上的H2S。十甲基环五硅氧烷（D5）的去除随着更长的空床停留时间（EBRT）而增加。分配试验和微生物群落分析进一步表明，主要通过酸循环液中的化学吸收达到高达52％的D5去除率。最后，通过在酸性液体中的开环水解和使用源自沼气的CH4进行的缩环多反应，将D5转化为二甲基硅烷二醇（DMSD）和六甲基二硅氧烷（L2）的混合物。这些操作特征表明，非生物去除D5，

更新日期：2020-01-24

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