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Biological carbon dioxide utilisation in food waste anaerobic digesters

Abstract : Carbon dioxide (CO2) enrichment of anaerobic digesters (AD) was previously identified as a potential on-site carbon revalorisation strategy. This study addresses the lack of studies investigating this concept in up-scaled units and the need to understand the mechanisms of exogenous CO2 utilisation. Two pilot-scale ADs treating food waste were monitored for 225 days, with the test unit being periodically injected with CO2 using a bubble column. The test AD maintained a CH4 production rate of 0.56±0.13 m3 CH4·(kg VSfed·d)-1 and a CH4 concentration in biogas of 68% even when dissolved CO2 levels were increased by a 3 fold over the control unit. An additional uptake of 0.55 kg of exogenous CO2 was achieved in the test AD during the trial period. A 2.5 fold increase in hydrogen (H2) concentration was observed and attributed to CO2 dissolution and to an alteration of the acidogenesis and acetogenesis pathways. A hypothesis for conversion of exogenous CO2 has been proposed, which requires validation by microbial community analysis
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Submitted on : Wednesday, January 6, 2016 - 3:21:30 PM
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Y. Bajón Fernández, K. Green, K. Schuler, A. Soares, P. Vale, et al.. Biological carbon dioxide utilisation in food waste anaerobic digesters. Water Research, IWA Publishing, 2015, 87, pp.467-475. ⟨10.1016/j.watres.2015.06.011⟩. ⟨hal-01162341v2⟩

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