Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery

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dc.check.date2022-04-08
dc.check.infoAccess to this article is restricted until 24 months after publication by request of the publisher.en
dc.contributor.authorDeng, Chen
dc.contributor.authorKang, Xihui
dc.contributor.authorLin, Richen
dc.contributor.authorMurphy, Jerry D.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Regional Development Funden
dc.contributor.funderInterregen
dc.contributor.funderHorizon 2020en
dc.contributor.funderH2020 Marie Skłodowska-Curie Actionsen
dc.contributor.funderEnvironmental Protection Agencyen
dc.contributor.funderEnvironmental Protection Agency, Irelanden
dc.contributor.funderGas Networks Irelanden
dc.date.accessioned2020-07-02T13:25:59Z
dc.date.available2020-07-02T13:25:59Z
dc.date.issued2020-04-08
dc.date.updated2020-07-02T12:19:42Z
dc.description.abstractWith the growth of anaerobic digestion (AD) for biogas production, associated increasing digestate production may cause environmental problems if the increasing agricultural land required for digestate application is limited. An alternative is to valorise the digestate. Microwave assisted low-temperature hydrothermal treatment (MLHT; temperature 100 – 180 °C) was investigated as a post-treatment for AD of grass silage under two scenarios: 1) AD + MLHT and 2) Acid pre-treatment + AD + MLHT. Compared to the original grass silage, the digestates investigated required lower temperatures for carbonization in MLHT owing to their lower cellulose content. The higher MLHT temperatures (160 – 180 °C) led to significant increases in heating value and greater reductions in atomic ratios of O/C and H/C of hydrochar due to dehydration and decarboxylation reactions. As a result, higher temperatures contributed to higher sugar recovery, higher solid solubilization, and better quality of hydrochar. Under the MLHT at 180 °C, the hydrochar produced from digested grass silage in scenario 1 (AD + MLHT) exhibited a mass yield of 0.79 g/g total solid, a carbon content of 63.6% and an ash-free heating value of 27.6 kJ/g volatile solid; the biomethane potential from the process liquor was estimated as 68.7 ml CH4/g total solid. Scenario 1 is preferred over scenario 2 (acid pre-treatment + AD + MLHT) as it gave a higher yield and higher heating value of hydrochar. This study suggests that MLHT is a promising method to 1) produce hydrochar with an energy value comparable to lignite coal, and 2) recover additional biomethane through process liquor recycling.en
dc.description.sponsorshipScience Foundation Ireland (SFI through the MaREI Centre for Energy, Climate and Marine under Grant No. 12/RC/2302_P2 and 16/SP/3829); European Regional Development Fund (under the Interreg NWE Project BIOWILL (NWE 964)); Environmental Protection Agency – Ireland (2018-RE-MS-13); Gas Networks Ireland (Industrial funding through through the Gas Innovation Group)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid124999en
dc.identifier.citationDeng, C., Kang, X., Lin, R. and Murphy, J. D. (2020) 'Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery', Chemical Engineering Journal, 395, 124999 (13 pp).en
dc.identifier.doi10.1016/j.cej.2020.124999en
dc.identifier.endpage13en
dc.identifier.issn1385-8947
dc.identifier.journaltitleChemical Engineering Journalen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/10202
dc.identifier.volume395en
dc.language.isoenen
dc.publisherElsevieren
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.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.urihttp://www.sciencedirect.com/science/article/pii/S1385894720309918
dc.rights© 2020 Elsevier B. V. All rights reserved. This manuscript version is made available under the CC BY-NC-ND 4.0 license.en
dc.subjectHydrocharen
dc.subjectAnaerobic digestionen
dc.subjectDigestate post-treatmenten
dc.subjectMicrowave assisted hydrothermal treatmenten
dc.titleMicrowave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recoveryen
dc.typeArticle (peer-reviewed)en
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