Guneratnam, Amita Jacob; Ahern, Eoin; FitzGerald, Jamie A.; Jackson, Stephen A.; Xia, Ao; Dobson, Alan D. W.; Murphy, Jerry D.

2017

February

Bioresource Technology

Study of the performance of a thermophilic biological methanation system

Published

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Biogas Power to gas Biological methanation Methanogenic archaea Volatile fatty acids

225

308

315

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.

0960-8524

//www.sciencedirect.com/science/article/pii/S0960852416315875

10.1016/j.biortech.2016.11.066

Science Foundation Ireland

Centre for Marine and Renewable Energy (MaREI) under Grant No. 12/RC/2302.