Biological hydrogen-methane conversion technology can combine Power-to-Gas technology with biogas engineering and showed great potential in breaking through the limitations of both hydrogen storage and CO2 removal for biogas upgrading. However, the low gas–liquid mass transfer rate of hydrogen greatly limited its conversion efficiency and actual application. This study used a biotrickling filter (BTF) to address this limiting factor, and the effects of temperature and packing materials on hydrogen-methane conversion were investigated. Results showed that higher temperature was beneficial for hydrogen-methane conversion, and the highest conversion efficiency of 8.3 L/Lw·d was obtained at 55 °C with the archaeal community dominated by Methanothermobacter (99.97 %). The reactor using activated carbon as packing material showed the best hydrogen-methane conversion efficiency of 91.9 %, with the most methanogens fixed on the surface. Due to the electronic conductor property of activated carbon, the microbial communities of the biofilm were also different from the other two packing materials. Finally, the H2/CO2 ratio of the gas inflow was optimized, and the most suitable result was 2.5:1 (H2/CO2, v/v), which was far below the previously reported results and indicated higher efficiency in carbon dioxide removal. This study provided a promising way for biogas upgrading.

中文翻译：

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通过生物滴滤池升级沼气：温度和填料的影响


生物氢-甲烷转化技术可以将电转气技术与沼气工程相结合，在突破储氢和脱除沼气提质的局限性方面显示出巨大的潜力。然而，氢气较低的气液传质速率极大地限制了其转化效率和实际应用。本研究使用生物滴滤器（BTF）来解决这一限制因素，并研究了温度和填充材料对氢-甲烷转化的影响。结果表明，较高的温度有利于氢气-甲烷转化，55 ℃时转化效率最高，为8.3 L/Lw·d，古菌群落以甲烷嗜热杆菌为主（99.97 %）。以活性炭为填料的反应器表现出最佳的氢气-甲烷转化效率，达到91.9%，大部分甲烷菌固定在表面。由于活性炭的电子导体特性，生物膜的微生物群落也不同于其他两种包装材料。最后，对气体流入的H2/CO2比例进行了优化，最合适的结果是2.5:1（H2/CO2，v/v），远低于之前报道的结果，表明二氧化碳去除效率更高。这项研究为沼气升级提供了一条有前途的途径。