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Biofiltration of H2S-rich biogas using Acidithiobacillus thiooxidans

机译：使用硫代酸硫硫杆菌对富H2S沼气进行生物过滤

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摘要

Biogas has limited use in energy generation mainly due to the presence of hydrogen sulfide (H2S). Currently, most of the techniques employed in the removal of H2S from biogas have a chemical base, with high material costs and generating secondary pollutants. Biological processes for H2S removal have become effective and economical alternative techniques to traditional gas-treatment systems based on physicochemical techniques. Therefore, the aim of this work was to investigate the performance of a bench-scale biofilter for the removal of H2S present in synthetic biogas. In addition, CO2 and CH4 concentrations in the outlet biogas were evaluated. The inoculum used in the experiment was composed of Acidithiobacillus thiooxidans fixed on a packing of wood chips. Synthetic biogas was supplied to the system with a composition of 60 % CH4, 39 % CO2 and 1 % H2S. The biofilter operated continuously for 37 days with an average H2S removal efficiency of 75 +/- A 13 % and maximum of 97 %. The elimination capacity of the system reached an average of 130 +/- A 23 g m(-3) h(-1) and a maximum of 169 g m(3) h(-1). The biofiltration system showed an average reduction of only 6 % in CH4 concentration from biogas. Thus, besides being efficient in the removal of H2S, the system was able to maintain the biogas energy value.
机译：沼气在能源生产中的使用受到限制，主要是由于存在硫化氢（H2S）。当前，从沼气中去除H2S的大多数技术都具有化学基础，其材料成本高且会产生二次污染物。去除H2S的生物过程已成为基于物理化学技术的传统气体处理系统的有效且经济的替代技术。因此，这项工作的目的是研究台式生物滤池用于去除合成沼气中H2S的性能。此外，还评估了出口沼气中的CO2和CH4浓度。实验中使用的接种物由固定在木片包装上的硫代酸硫硫杆菌组成。合成沼气的组成为60％CH4、39％CO2和1％H2S。该生物滤池连续运行37天，平均H2S去除效率为75 +/- A 13％，最大值为97％。该系统的消除能力达到平均130 +/- A 23 g m（-3）h（-1）和最大169 g m（3）h（-1）。生物过滤系统显示沼气中CH4浓度平均仅降低6％。因此，除了有效去除H2S之外，该系统还能够保持沼气能量值。

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