Graphene addition to digestion of thin stillage can alleviate acidic shock and improve biomethane production

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dc.contributor.author Wu, Benteng
dc.contributor.author Lin, Richen
dc.contributor.author Kang, Xihui
dc.contributor.author Deng, Chen
dc.contributor.author Xia, Ao
dc.contributor.author Dobson, Alan D. W.
dc.contributor.author Murphy, Jerry D.
dc.date.accessioned 2020-09-18T08:31:29Z
dc.date.available 2020-09-18T08:31:29Z
dc.date.issued 2020-08-12
dc.identifier.citation Wu, B., Lin, R., Kang, X., Deng, C., Xia, A., Dobson, A. D. W. and Murphy, J. D. (2020) 'Graphene addition to digestion of thin stillage can alleviate acidic shock and improve biomethane production', ACS Sustainable Chemistry and Engineering, 8(35), pp. 13248-13260. doi: 10.1021/acssuschemeng.0c03484 en
dc.identifier.volume 8 en
dc.identifier.issued 35 en
dc.identifier.startpage 13248 en
dc.identifier.endpage 13260 en
dc.identifier.uri http://hdl.handle.net/10468/10547
dc.identifier.doi 10.1021/acssuschemeng.0c03484 en
dc.description.abstract Production of biomethane from distillery byproducts (such as stillage) in a circular economy system may facilitate a climate neutral alcohol industry. Anaerobic digestion (AD) of easily degradable substrates can lead to rapid acidification and accumulation of intermediate volatile fatty acids, reducing microbial activity and biomethane production. Carbonaceous materials may function as an abiotic conductive conduit to stimulate microbial electron transfer and resist adverse impacts on AD. Herein, nanomaterial graphene and more cost-effective pyrochar were comparatively assessed in their ability to recover AD performance after acidic shock (pH 5.5). Results showed that graphene addition (1.0 g/L) could lead to a biomethane yield of 250 mL/g chemical oxygen demand; this is an 11.0% increase compared to that of the control. The recovered process was accompanied by faster propionate degradation (CH3CH2COO– + 2H2O → CH3COO– + CO2 + 6H+ + 6e–). The enhanced performance was possibly ascribed to the high electrical conductivity of graphene. In comparison, pyrochar addition (1.0 and 10.0 g/L) did not enhance the biomethane yield, though it reduced the digestion lag-phase time by 18.1% and 12.2% compared to the control, respectively. Microbial taxonomy analysis suggested that Methanosarcina (81.5% in abundance) with diverse metabolic pathways and OTU in the order DTU014 (6.4% in abundance) might participate in direct interspecies electron transfer contributing to an effective recovery from acidic shock. en
dc.description.sponsorship Environmental Protection Agency (2018-RE-MS-13); Science Foundation Ireland (Grants 12/RC/2302_P2 and 16/SP/3829); Sustainable Energy Authority of Ireland (RDD/00454); National Natural Science Foundation of China (Grant 51876016) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher ACS Publications en
dc.rights © 2020, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry and Engineering after technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acssuschemeng.0c03484 en
dc.subject Anaerobic digestion en
dc.subject Biomethane en
dc.subject Conductive materials en
dc.subject Acidic shock en
dc.subject Thin stillage en
dc.title Graphene addition to digestion of thin stillage can alleviate acidic shock and improve biomethane production 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 12 months after publication by request of the publisher. en
dc.check.date 2021-08-12
dc.description.version Accepted Version en
dc.contributor.funder Environmental Protection Agency en
dc.contributor.funder Horizon 2020 en
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Sustainable Energy Authority of Ireland en
dc.contributor.funder National Natural Science Foundation of China en
dc.description.status Peer reviewed en
dc.identifier.journaltitle ACS Sustainable Chemistry and Engineering en
dc.internal.IRISemailaddress richen.lin@ucc.ie 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.identifier.eissn 2168-0485


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