Journal
ENERGY
Volume 118, Issue -, Pages 1079-1089Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2016.10.132
Keywords
Laminaria sp.; Ascophyllum nodosum; Anaerobic digestion; Pretreatment; Organic substrate concentration
Categories
Funding
- Irish Research Council for Science, Engineering and Technology - National Development Plan [RS/2012/417]
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The European Commission opened a discussion about limiting first generation food based biofuels in favour of advanced biofuels. The main reason was to limit the uncertainty in estimates of indirect land use change emissions (ILUC) of food based biofuels. Brown seaweeds represent a valuable solution. The lack of lignin makes them suitable for degradation processes such as anaerobic digestion (AD). The main output of AD is biogas which can be upgraded to biomethane and used as a transport fuel. The most common Irish brown seaweeds namely Laminaria sp. and Ascophyllum nodosum were subject to AD. The effects of beating pretreatment time (5-10-15 min) and changes in the seaweeds volatile solids (VS) concentration (1-2.5-4%) on methane production were investigated through a response surface methodology (RSM). Laminaria sp. showed the highest methane yield of 240 ml CH4 g(-1) VS when the pretreatment time was set at 15 min and at VS concentration of 2.5%. In the case of Ascophyllum nodosum, the best yield of 169 mL CH4 g(-1) VS was found at the longest pretreatment time tested and at the minimum concentration of VS. The RSM analysis revealed that the VS concentration had the strongest impact on the methane yield. (C) 2016 Elsevier Ltd. All rights reserved.
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