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

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dc.contributor.authorWu, Benteng
dc.contributor.authorLin, Richen
dc.contributor.authorKang, Xihui
dc.contributor.authorDeng, Chen
dc.contributor.authorXia, Ao
dc.contributor.authorDobson, Alan D. W.
dc.contributor.authorMurphy, Jerry D.
dc.contributor.funderEnvironmental Protection Agencyen
dc.contributor.funderHorizon 2020en
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderSustainable Energy Authority of Irelanden
dc.contributor.funderNational Natural Science Foundation of Chinaen
dc.date.accessioned2020-09-18T08:31:29Z
dc.date.available2020-09-18T08:31:29Z
dc.date.issued2020-08-12
dc.description.abstractProduction 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.sponsorshipEnvironmental 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.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationWu, 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.0c03484en
dc.identifier.doi10.1021/acssuschemeng.0c03484en
dc.identifier.eissn2168-0485
dc.identifier.endpage13260en
dc.identifier.issued35en
dc.identifier.journaltitleACS Sustainable Chemistry and Engineeringen
dc.identifier.startpage13248en
dc.identifier.urihttps://hdl.handle.net/10468/10547
dc.identifier.volume8en
dc.language.isoenen
dc.publisherACS Publicationsen
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.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.0c03484en
dc.subjectAnaerobic digestionen
dc.subjectBiomethaneen
dc.subjectConductive materialsen
dc.subjectAcidic shocken
dc.subjectThin stillageen
dc.titleGraphene addition to digestion of thin stillage can alleviate acidic shock and improve biomethane productionen
dc.typeArticle (peer-reviewed)en
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