Peer-Reviewed Journal Details Mandatory Fields Authors Guneratnam, Amita Jacob; Ahern, Eoin; FitzGerald, Jamie A.; Jackson, Stephen A.; Xia, Ao; Dobson, Alan D. W.; Murphy, Jerry D. Year 2017 Month February Journal Bioresource Technology Title Study of the performance of a thermophilic biological methanation system Status Published Times Cited Altmetric: 1 () Optional Fields Keywords Biogas Power to gas Biological methanation Methanogenic archaea Volatile fatty acids Volume 225 Issue Start Page 308 End Page 315 Abstract This study investigated the operation of ex-situ biological methanation at two thermophilic temperatures (55 °C and 65 °C). Methane composition of 85–88% was obtained and volumetric productivities of 0.45 and 0.4 L CH4/L reactor were observed at 55 °C and 65 °C after 24 h respectively. It is postulated that at 55 °C the process operated as a mixed culture as the residual organic substrates in the starting inoculum were still available. These were consumed prior to the assessment at 65 °C; thus the methanogens were now dependent on gaseous substrates CO2 and H2. The experiment was repeated at 65 °C with fresh inoculum (a mixed culture); methane composition and volumetric productivity of 92% and 0.46 L CH4/L reactor were achieved in 24 h. Methanothermobacter species represent likely and resilient candidates for thermophilic biogas upgrading. Publisher Location ISBN / ISSN 0960-8524 Edition URL //www.sciencedirect.com/science/article/pii/S0960852416315875 DOI Link 10.1016/j.biortech.2016.11.066 Grant Details Funding Body Science Foundation Ireland Grant Details Centre for Marine and Renewable Energy (MaREI) under Grant No. 12/RC/2302.