Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery
dc.contributor.author | Deng, Chen | |
dc.contributor.author | Kang, Xihui | |
dc.contributor.author | Lin, Richen | |
dc.contributor.author | Murphy, Jerry D. | |
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.date.accessioned | 2020-07-02T13:25:59Z | |
dc.date.available | 2020-07-02T13:25:59Z | |
dc.date.issued | 2020-04-08 | |
dc.date.updated | 2020-07-02T12:19:42Z | |
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.description.status | Peer reviewed | en |
dc.description.version | Accepted Version | en |
dc.format.mimetype | application/pdf | en |
dc.identifier.articleid | 124999 | en |
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.doi | 10.1016/j.cej.2020.124999 | en |
dc.identifier.endpage | 13 | en |
dc.identifier.issn | 1385-8947 | |
dc.identifier.journaltitle | Chemical Engineering Journal | en |
dc.identifier.startpage | 1 | en |
dc.identifier.uri | https://hdl.handle.net/10468/10202 | |
dc.identifier.volume | 395 | en |
dc.language.iso | en | en |
dc.publisher | Elsevier | 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 |
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.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
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 |
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