Biological carbon dioxide utilisation in food waste anaerobic digesters

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dc.contributor.authorBajón Fernández, Yadira
dc.contributor.authorGreen, Kevin
dc.contributor.authorSchuler, K.
dc.contributor.authorSoares, Ana
dc.contributor.authorVale, Peter C. J.
dc.contributor.authorAlibardi, Luca
dc.contributor.authorCartmell, Elise
dc.date.accessioned2016-03-01T14:20:40Z
dc.date.available2016-03-01T14:20:40Z
dc.date.issued2015-06-09
dc.description.abstractCarbon 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.en_UK
dc.identifier.citationBajón Fernández Y, Green K, Schuler K, et al., (2015) Biological carbon dioxide utilisation in food waste anaerobic digesters. Water Research, Volume 87, December 2015, pp. 467-475en_UK
dc.identifier.cris5315122
dc.identifier.issn0043-1354
dc.identifier.urihttps://doi.org/10.1016/j.watres.2015.06.011
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/9739
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleBiological carbon dioxide utilisation in food waste anaerobic digestersen_UK
dc.typeArticleen_UK

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