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Influence of nutrient medium supply rate and liquid recirculation regime on syngas biomethanation in thermophilic trickle-bed reactor

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Title: Influence of nutrient medium supply rate and liquid recirculation regime on syngas biomethanation in thermophilic trickle-bed reactor
Authors: Gabler, Florian, Cheng, George, Schnürer, Anna, Nordberg, Åke
Contributors: Sveriges lantbruksuniversitet, Originator
Source: Bioresource technology reports. 32
Subject Terms: Bioenergy, Bioenergi
Description: 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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  Data: Influence of nutrient medium supply rate and liquid recirculation regime on syngas biomethanation in thermophilic trickle-bed reactor
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  Data: <searchLink fieldCode="AR" term="%22Gabler%2C+Florian%22">Gabler, Florian</searchLink><br /><searchLink fieldCode="AR" term="%22Cheng%2C+George%22">Cheng, George</searchLink><br /><searchLink fieldCode="AR" term="%22Schnürer%2C+Anna%22">Schnürer, Anna</searchLink><br /><searchLink fieldCode="AR" term="%22Nordberg%2C+Åke%22">Nordberg, Åke</searchLink>
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  Data: Sveriges lantbruksuniversitet, Originator
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  Data: <i>Bioresource technology reports</i>. 32
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  Data: 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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