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

Sammanfattning

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 H-2 and CO2 by syntrophic acetate oxidizing bacteria (SAOB) and subsequently used for hydrogenotrophic methanogenesis.

Nyckelord

Biomethanation; Syngas; Microbial community; Carbon monoxide conversion; Digestate; Reject water

Publicerad i

Waste and Biomass Valorization
2025
Utgivare: SPRINGER

SLU författare

• Gabler, Florian

  • Institutionen för energi och teknik, Sveriges lantbruksuniversitet
    
  • RISE Research Institutes of Sweden

• Cheng, George

  • Institutionen för molekylära vetenskaper, Sveriges lantbruksuniversitet
    

• Janke, Leandro

  • Institutionen för energi och teknik, Sveriges lantbruksuniversitet
    

• Schnürer, Anna

  • Institutionen för molekylära vetenskaper, Sveriges lantbruksuniversitet
    

• Nordberg, Åke

  • Institutionen för energi och teknik, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Bioprocessteknik

Publikationens identifierare

• DOI: https://doi.org/10.1007/s12649-025-03257-5

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/143382