Influence of nutrient medium supply rate and liquid recirculation regime on syngas biomethanation in thermophilic trickle-bed reactor
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| Titel: | Influence of nutrient medium supply rate and liquid recirculation regime on syngas biomethanation in thermophilic trickle-bed reactor |
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| Autoren: | Gabler, Florian, Cheng, George, Schnürer, Anna, Nordberg, Åke |
| Weitere Verfasser: | Sveriges lantbruksuniversitet, Originator |
| Quelle: | Bioresource technology reports. 32 |
| Schlagwörter: | Bioenergy, Bioenergi |
| Beschreibung: | Syngas biomethanation enables the use of recalcitrant biomass or waste for methane production. To reveal knowledge on the importance of nutrient medium supply rate (NMSR) and liquid recirculation regime, a thermophilic 5 L trickle-bed reactor was operated for 283 days. Efficient and stable operation with >99 % H-2 and CO conversion rates was achieved at a minimum NMSR of 14 mL/(L-pbvd) and 1 h gas retention time, yielding a maximum methane evolution rate (MER) of 4.3 L/(L-pbvd). Reduced intermittent liquid recirculation resulted in lowered MERs (max. 3.4 L/(L-pbvd)) with CO conversion more affected by low recirculation frequencies than H-2 conversion. The microbial analysis revealed a similar microbial community structure across all experimental phases, dominated by Methanothermobacter in both liquid and carrier biofilm. CO was likely converted to methane and acetate, with syntrophic acetate-oxidizing bacteria metabolizing acetate to H-2 and CO2, supporting efficient hydrogenotrophic methanogenesis. |
| Zugangs-URL: | https://res.slu.se/id/publ/144562 https://pub.epsilon.slu.se/id/eprint/38807/contents |
| Datenbank: | SwePub |
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Nájsť tento článok vo Web of Science | Abstract: | Syngas biomethanation enables the use of recalcitrant biomass or waste for methane production. To reveal knowledge on the importance of nutrient medium supply rate (NMSR) and liquid recirculation regime, a thermophilic 5 L trickle-bed reactor was operated for 283 days. Efficient and stable operation with >99 % H-2 and CO conversion rates was achieved at a minimum NMSR of 14 mL/(L-pbvd) and 1 h gas retention time, yielding a maximum methane evolution rate (MER) of 4.3 L/(L-pbvd). Reduced intermittent liquid recirculation resulted in lowered MERs (max. 3.4 L/(L-pbvd)) with CO conversion more affected by low recirculation frequencies than H-2 conversion. The microbial analysis revealed a similar microbial community structure across all experimental phases, dominated by Methanothermobacter in both liquid and carrier biofilm. CO was likely converted to methane and acetate, with syntrophic acetate-oxidizing bacteria metabolizing acetate to H-2 and CO2, supporting efficient hydrogenotrophic methanogenesis. |
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| ISSN: | 2589014X |
| DOI: | 10.1016/j.biteb.2025.102353 |