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<p>Syngas biomethanation is an emerging technology which accelerates the utilization of gasification products. However, to upscale the process and reach technological maturity, the supply of nutrients is an important aspect to consider. This study aimed to evaluate the influence of three different nutrient media (defined basal medium, digestate and reject water) on CH<sub>4</sub> productivity and CO conversion kinetics. Additionally, the feasibility of using a mesophilic inoculum for the transition to thermophilic conditions was assessed. The results show that the utilization of undefined nutrient media (digestate and reject water) is competitive with synthetic defined media concerning the kinetics of CH<sub>4</sub> productivity and CO conversion. Still, nutrient-specific differences in the microbial composition were observed alongside a temperature-driven shift. Carbon monoxide was mainly converted to acetate, which was metabolized to H<sub>2</sub> and CO<sub>2</sub> by syntrophic acetate oxidizing bacteria (SAOB) and subsequently used for hydrogenotrophic methanogenesis.</p>

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Impact of Nutrient Media and Temperature Shift on Methane Productivity and Carbon Monoxide Conversion in Syngas Biomethanation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月11日

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  • Florian Gabler,
  • George Cheng,
  • Leticia Pizzul,
  • Leandro Janke,
  • Anna Schnürer,
  • Åke Nordberg

摘要

Syngas biomethanation is an emerging technology which accelerates the utilization of gasification products. However, to upscale the process and reach technological maturity, the supply of nutrients is an important aspect to consider. This study aimed to evaluate the influence of three different nutrient media (defined basal medium, digestate and reject water) on CH4 productivity and CO conversion kinetics. Additionally, the feasibility of using a mesophilic inoculum for the transition to thermophilic conditions was assessed. The results show that the utilization of undefined nutrient media (digestate and reject water) is competitive with synthetic defined media concerning the kinetics of CH4 productivity and CO conversion. Still, nutrient-specific differences in the microbial composition were observed alongside a temperature-driven shift. Carbon monoxide was mainly converted to acetate, which was metabolized to H2 and CO2 by syntrophic acetate oxidizing bacteria (SAOB) and subsequently used for hydrogenotrophic methanogenesis.