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

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dc.contributor.author Deng, Chen
dc.contributor.author Kang, Xihui
dc.contributor.author Lin, Richen
dc.contributor.author Murphy, Jerry D.
dc.date.accessioned 2020-07-02T13:25:59Z
dc.date.available 2020-07-02T13:25:59Z
dc.date.issued 2020-04-08
dc.identifier.citation Deng, 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.volume 395 en
dc.identifier.startpage 1 en
dc.identifier.endpage 13 en
dc.identifier.issn 1385-8947
dc.identifier.uri http://hdl.handle.net/10468/10202
dc.identifier.doi 10.1016/j.cej.2020.124999 en
dc.description.abstract With 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.sponsorship Science 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Elsevier en
dc.relation.uri http://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.subject Hydrochar en
dc.subject Anaerobic digestion en
dc.subject Digestate post-treatment en
dc.subject Microwave assisted hydrothermal treatment en
dc.title Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Richen Lin, Environmental Research Institute, 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 2022-04-08
dc.date.updated 2020-07-02T12:19:42Z
dc.description.version Accepted Version en
dc.internal.rssid 522472434
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder European Regional Development Fund en
dc.contributor.funder Interreg en
dc.contributor.funder Horizon 2020 en
dc.contributor.funder H2020 Marie Skłodowska-Curie Actions en
dc.contributor.funder Environmental Protection Agency en
dc.contributor.funder Environmental Protection Agency, Ireland en
dc.contributor.funder Gas Networks Ireland en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Chemical Engineering Journal en
dc.internal.copyrightchecked Yes
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress richen.lin@ucc.ie en
dc.internal.IRISemailaddress chen.deng@ucc.ie en
dc.internal.IRISemailaddress jerry.murphy@ucc.ie en
dc.identifier.articleid 124999 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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