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Biofuel from wastewater-grown microalgae: A biorefinery approach using hydrothermal liquefaction and catalyst upgrading

2024-09Journal article Open access
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dc.contributor.authorSilva, Thiago
dc.contributor.authorde Aguiar do Couto, Eduardo
dc.contributor.authorAssemany, Paula
dc.contributor.authorCosta, Paula
dc.contributor.authorMarques, Paula
dc.contributor.authorParadela, Filipe
dc.contributor.authorReis, Alberto
dc.contributor.authorCalijuri, Maria Lucia
dc.date.accessioned2024-08-30T15:02:52Z
dc.date.available2024-08-30T15:02:52Z
dc.date.issued2024-09
dc.description.abstractABSTRACT: Third-generation biofuels from microalgae are becoming necessary for sustainable energy. In this context, this study explores the hydrothermal liquefaction (HTL) of microalgae biomass grown in wastewater, consisting of 30% Chlorella vulgaris, 69% Tetradesmus obliquus, and 1% cyanobacteria Limnothrix planctonica, and the subsequent upgrading of the produced bio-oil. The novelty of the work lies in integrating microalgae cultivation in wastewater with HTL in a biorefinery approach, enhanced using a catalyst to upgrade the bio-oil. Different temperatures (300, 325, and 350 degrees C) and reaction times (15, 30, and 45 min) were tested. The bio-oil upgrading occurred with a Cobalt-Molybdenum (CoMo) catalyst for 1 h at 375 degrees C. Post-HTL, although the hydrogen-to-carbon (H/C) ratio decreased from 1.70 to 1.38-1.60, the oxygen-to-carbon (O/C) ratio also decreased from 0.39 to 0.079-0.104, and the higher heating value increased from 20.6 to 36.4-38.3 MJ kg(-1). Palmitic acid was the main component in all bio-oil samples. The highest bio-oil yield was at 300 degrees C for 30 min (23.4%). Upgrading increased long-chain hydrocarbons like heptadecane (5%), indicating biofuel potential, though nitrogenous compounds such as hexadecanenitrile suggest a need for further hydrodenitrogenation. Aqueous phase, solid residues, and gas from HTL can be used for applications such as biomass cultivation, bio-hydrogen, valuable chemicals, and materials like carbon composites and cement additives, promoting a circular economy. The study underscores the potential of microalgae-derived bio-oil as sustainable biofuel, although further refinement is needed to meet current fuel standards.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSilva, T.A., do Couto, E.D., Assemany, P.P., Costa, P.A., Marques, P. A., Paradela, F., Reis, A. & Calijuri, M.L. (2024) Biofuel from wastewater-grown microalgae: A biorefinery approach using hydrothermal liquefaction and catalyst upgrading. In: Journal of Environmental Management, 2024, vol. 368, article nº 122091. https://doi.org/10.1016/j.jenvman.2024.122091pt_PT
dc.identifier.doi10.1016/j.jenvman.2024.122091pt_PT
dc.identifier.eissn1095-8630
dc.identifier.issn0301-4797
dc.identifier.urihttp://hdl.handle.net/10400.9/4329
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://doi.org/10.1016/j.jenvman.2024.122091pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMicroalgaept_PT
dc.subjectBiofuelspt_PT
dc.subjectBiomass valorisationpt_PT
dc.subjectBiorefinerypt_PT
dc.subjectRenewable energiespt_PT
dc.titleBiofuel from wastewater-grown microalgae: A biorefinery approach using hydrothermal liquefaction and catalyst upgradingpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleJournal of Environmental Managementpt_PT
oaire.citation.volume368pt_PT
person.familyNameSilva
person.familyNamede Aguiar do Couto
person.familyNamePeixoto Assemany
person.familyNameCosta
person.familyNameMarques
person.familyNameParadela
person.familyNameDelgado dos Reis
person.familyNameCalijuri
person.givenNameThiago
person.givenNameEduardo
person.givenNamePaula
person.givenNamePaula
person.givenNamePaula
person.givenNameFilipe
person.givenNameAlberto José
person.givenNameMaria Lucia
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person.identifier.ciencia-idE317-E8DB-14E3
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person.identifier.orcid0000-0001-7596-7804
person.identifier.orcid0000-0003-2024-4267
person.identifier.orcid0000-0002-0033-9333
person.identifier.orcid0000-0001-7928-7339
person.identifier.orcid0000-0002-1405-9981
person.identifier.orcid0000-0002-0918-2475
person.identifier.ridI-4426-2014
person.identifier.ridE-1248-2014
person.identifier.ridP-6395-2015
person.identifier.ridG-1546-2012
person.identifier.scopus-author-id57218439017
person.identifier.scopus-author-id55632236000
person.identifier.scopus-author-id26031123400
person.identifier.scopus-author-id57204744399
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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