Biological carbon dioxide utilisation in food waste anaerobic digesters

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dc.contributor.authorBajón Fernández, Yadira
dc.contributor.authorGreen, K.
dc.contributor.authorSchuler, K.
dc.contributor.authorSoares, Ana
dc.contributor.authorVale, P.
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.citationY. Bajón Fernández, K. Green, K. Schuler, A. Soares, P. Vale, L. Alibardi, E. Cartmell, Biological carbon dioxide utilisation in food waste anaerobic digesters, Water Research, Volume 87, 15 December 2015, pp467-475en_UK
dc.identifier.cris5315122
dc.identifier.issn0043-1354
dc.identifier.urihttp://dx.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 (CC BY 4.0) Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.titleBiological carbon dioxide utilisation in food waste anaerobic digestersen_UK
dc.typeArticleen_UK

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