Improving gaseous biofuel production from seaweed Saccharina latissima: the effect of hydrothermal pretreatment on energy efficiency

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dc.contributor.authorLin, Richen
dc.contributor.authorDeng, Chen
dc.contributor.authorDing, Lingkan
dc.contributor.authorBose, Archishman
dc.contributor.authorMurphy, Jerry D.
dc.contributor.funderHorizon 2020en
dc.contributor.funderEnvironmental Protection Agencyen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderErvia, Irelanden
dc.contributor.funderGas Networks Irelanden
dc.date.accessioned2019-07-18T11:07:47Z
dc.date.available2019-07-18T11:07:47Z
dc.date.issued2019-07-08
dc.date.updated2019-07-18T10:58:58Z
dc.description.abstractMarine macroalgae (seaweed) is a promising feedstock for producing biohydrogen and biomethane via dark fermentation and anaerobic digestion, respectively. However, one of the limiting steps in the biological process is the conversion of polymeric carbohydrates into monomeric sugars. Here hydrothermal pretreatments were assessed for hydrolysis and subsequent production of biohydrogen and biomethane from the brown seaweed Saccharina latissima. The solubilization of S. latissima improved with increasing temperatures from 100 to 180 °C, resulting in a maximum yield of 0.70 g soluble chemical oxygen demand/gram volatile solid (sCOD/g VS); equivalent to an increase of 207.5% compared with untreated seaweed. However, the yield of the derived monomeric sugar mannitol peaked at 140 °C and decreased with increasing temperatures, likely due to production of fermentative inhibitors. Microstructural characterization revealed that the algal structure was significantly damaged, and the major chemical groups of carbohydrates and proteins were weakened after pretreatment. Regardless of hydrothermal temperatures, biohydrogen yield only slightly increased in dark fermentation, while biomethane yield significantly increased from 281.4 (untreated S. latissima) to 345.1 mL/g VS (treated at 140 °C), leading to the sCOD removal efficiency of 86.1%. The maximum energy conversion efficiency of 72.8% was achieved after two-stage biohydrogen and biomethane co-production. In comparison, considering the energy input for pretreatment/fermentation/digestion, the highest process energy efficiency dropped to 37.8%. Further calculations suggest that a significant improvement of efficiency up to 56.9% can be achieved if the heat from pretreatment can be recovered.en
dc.description.sponsorshipEnvironmental Protection Agency (2018-RE-MS-13); Science Foundation Ireland (16/SP/3829)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationLin, R., Deng, C., Ding, L., Bose, A. and Murphy, J. D. (2019) 'Improving gaseous biofuel production from seaweed Saccharina latissima: the effect of hydrothermal pretreatment on energy efficiency', Energy Conversion and Management, 196, pp. 1385-1394. doi: 10.1016/j.enconman.2019.06.044en
dc.identifier.doi10.1016/j.enconman.2019.06.044en
dc.identifier.endpage1394en
dc.identifier.issn0196-8904
dc.identifier.journaltitleEnergy Conversion and Managementen
dc.identifier.startpage1385en
dc.identifier.urihttps://hdl.handle.net/10468/8198
dc.identifier.volume196en
dc.language.isoenen
dc.publisherElsevier Ltd.en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::MSCA-IF-EF-ST/797259/EU/Direct Interspecies Electron Transfer in advanced anaerobic digestion system for gaseous transport biofuel production/DIETen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2302/IE/Marine Renewable Energy Ireland (MaREI) - The SFI Centre for Marine Renewable Energy Research/en
dc.relation.urihttp://www.sciencedirect.com/science/article/pii/S0196890419307150
dc.rights© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectMacroalgaeen
dc.subjectHydrothermal pretreatmenten
dc.subjectEnergy efficiencyen
dc.subjectBiohydrogenen
dc.subjectBiomethaneen
dc.titleImproving gaseous biofuel production from seaweed Saccharina latissima: the effect of hydrothermal pretreatment on energy efficiencyen
dc.typeArticle (peer-reviewed)en
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