Can acid pre-treatment enhance biohydrogen and biomethane production from grass silage in single-stage and two-stage fermentation processes?

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dc.contributor.author Deng, Chen
dc.contributor.author Lin, Richen
dc.contributor.author Cheng, Jun
dc.contributor.author Murphy, Jerry D.
dc.date.accessioned 2019-06-06T11:15:12Z
dc.date.available 2019-06-06T11:15:12Z
dc.date.issued 2019-05-23
dc.identifier.citation Deng, C., Lin, R., Cheng, J. and Murphy, J. D. (2019) 'Can acid pre-treatment enhance biohydrogen and biomethane production from grass silage in single-stage and two-stage fermentation processes?', Energy Conversion and Management, 195, pp. 738-747. doi: 10.1016/j.enconman.2019.05.044 en
dc.identifier.volume 195 en
dc.identifier.startpage 738 en
dc.identifier.endpage 747 en
dc.identifier.issn 0196-8904
dc.identifier.uri http://hdl.handle.net/10468/8025
dc.identifier.doi 10.1016/j.enconman.2019.05.044 en
dc.description.abstract Grass silage is an excellent feedstock for biofuel production, however, the recalcitrant cellulosic structure may limit its biodegradability. In this study, the effect of acid pre-treatment with mild thermal treatment conditions on biohydrogen and biomethane production from grass silage was assessed through single-stage (CH4) and two-stage (H2 + CH4) fermentation. Microstructural characterisation showed that pre-treatment significantly reduced the recalcitrance and enlarged the specific area of grass silage. The optimal pre-treatment with 2% H2SO4 at 135 °C for 15 min achieved a total reducing sugar yield of 333.79 mg/g volatile solid (VS) of grass silage. The pre-treated silage led to a hydrogen yield of 68.26 ml/g VS in the first stage hydrogen fermentation, a 3-fold increase compared to untreated silage. The production of volatile fatty acids accordingly increased by 29.2%. In the second stage anaerobic digestion, untreated silage achieved the highest biomethane yield of 392.84 ml/g VS, with a corresponding highest total energy conversion efficiency of 83.5%. Due to a lower biomethane yield, the pre-treated silage presented a decreased total energy efficiency of 68.4%. In comparison, single-stage anaerobic digestion showed lower energy conversion efficiencies of 49.7% and 54.2% for the pre-treated and untreated silage, respectively. Despite the slight decrease in CH4 yield, the pre-treatment led to decreased energy consumption for the operation of anaerobic digestion processes due to the shorter digestion duration. en
dc.description.sponsorship Science Foundation Ireland (16/SP/3829); Environmental Protection Agency (EPA 2018-RE-MS-13) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier Ltd. en
dc.relation.uri http://www.sciencedirect.com/science/article/pii/S0196890419305990
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.uri https://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.subject Grass silage en
dc.subject Acid pre-treatment en
dc.subject Dark fermentation en
dc.subject Anaerobic digestion en
dc.subject Biohydrogen en
dc.subject Biomethane en
dc.title Can acid pre-treatment enhance biohydrogen and biomethane production from grass silage in single-stage and two-stage fermentation processes? en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Richen Lin, ERI, University College Cork, Cork, Ireland. +353-21-490-3000 Email: richen.lin@ucc.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 24 months after publication by request of the publisher. en
dc.check.date 2021-05-23
dc.date.updated 2019-06-06T11:08:12Z
dc.description.version Accepted Version en
dc.internal.rssid 488004912
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Horizon 2020 en
dc.contributor.funder Environmental Protection Agency en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Energy Conversion and Management en
dc.internal.copyrightchecked Yes
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress richen.lin@ucc.ie en
dc.relation.project info: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.project info: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/DIET en


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© 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license. Except where otherwise noted, this item's license is described as © 2019, Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.
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