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Bio-oil from hydrothermal liquefaction of microalgae cultivated in wastewater: An economic and life cycle approach

datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.fosEngenharia e Tecnologia::Biotecnologia Ambiental
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg12:Produção e Consumo Sustentáveis
datacite.subject.sdg13:Ação Climática
dc.contributor.authorSilva, Thiago
dc.contributor.authorJunior, Maurino Magno de Jesus
dc.contributor.authorMagalhães, Iara
dc.contributor.authorAnanias, Marina Stefany
dc.contributor.authorSaleme Aona de Paula Pereira, Alexia
dc.contributor.authorRodrigues, Fábio de Ávila
dc.contributor.authorDelgado dos Reis, Alberto José
dc.contributor.authorCalijuri, Maria Lucia
dc.date.accessioned2025-07-30T14:14:35Z
dc.date.available2025-07-30T14:14:35Z
dc.date.issued2025-06
dc.description.abstractABSTRACT: Although microalgae are a promising sustainable biofuel feedstock, their energy-intensive production and most environmental assessments rarely achieve the desired trade-off between productivity and sustainability. In this context, this study aims to evaluate the economic and environmental feasibility of producing bio-oil via hydrothermal liquefaction (HTL) of wastewater-grown microalgae at an industrial scale. Four scenarios varied production scale and steam source: sugarcane bagasse (SCB) in SC1 and SC3, liquefied petroleum gas (LPG) in SC2 and SC4. Each scenario processed microalgae at 300 degrees C for 30 min. Smaller-scale feedstock (1332.9 kg/h) in SC1 and SC2 produced 34.6 kg/h of bio-oil, while the larger feedstock (85,554.4 kg/h) in SC3 and SC4 yielded 2222.2 kg/h. Microalgae biomass cultivation costs dominated overall expenses (56-75 %). Economic analyses indicated minimum selling prices of 3.82-8.52 USD/kg, exceeding the average literature figure of 1.57 USD/kg. Life Cycle Assessment (LCA) showed SCB reduced fossil resource depletion by 14.97 % compared to LPG but increased emissions of nitrogen oxides, particulates, and toxic compounds, which are manageable via selective catalytic reduction and flue gas desulphurization. Cyclohexane as a solvent elevated human carcinogenic toxicity, greener alternatives could reduce toxicity but may cost more, requiring further cost analysis. Advancing this biorefinery route requires optimization of cultivation and processing costs, adoption of environmentally benign solvents, and implementation of emission control strategies to enable economically feasible and environmentally sustainable bio-oil production.eng
dc.identifier.citationSilva, T., Jesus Jr, M., Magalhaes, I., Ananias, M., Pereira, A., Rodrigues, F., Reis, A. & Calijuri, M.L. (2025). Bio-oil from hydrothermal liquefaction of microalgae cultivated in wastewater: An economic and life cycle approach. In: Journal of Cleaner Production, 2025, vol. 512, article 145719. https://doi.org/10.1016/j.jclepro.2025.145719
dc.identifier.doi10.1016/j.jclepro.2025.145719
dc.identifier.eissn1879-1786
dc.identifier.issn0959-6526
dc.identifier.urihttp://hdl.handle.net/10400.9/6010
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0959652625010698?via%3Dihub
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectEnergy efficiency
dc.subjectBiomass valorisation
dc.subjectBiorefinery
dc.subjectMicroalgae
dc.subjectProcess simulation
dc.subjectSustainability
dc.titleBio-oil from hydrothermal liquefaction of microalgae cultivated in wastewater: An economic and life cycle approacheng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleJournal of Cleaner Production
oaire.citation.volume512
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameSilva
person.familyNameMagalhães
person.familyNameSaleme Aona de Paula Pereira
person.familyNameDelgado dos Reis
person.familyNameCalijuri
person.givenNameThiago
person.givenNameIara
person.givenNameAlexia
person.givenNameAlberto José
person.givenNameMaria Lucia
person.identifier.ciencia-idE317-E8DB-14E3
person.identifier.orcid0000-0002-6108-8793
person.identifier.orcid0000-0002-0802-5996
person.identifier.orcid0000-0002-0720-5098
person.identifier.orcid0000-0002-1405-9981
person.identifier.orcid0000-0002-0918-2475
person.identifier.ridAAU-5692-2020
person.identifier.ridAAW-5853-2020
person.identifier.ridG-1546-2012
person.identifier.scopus-author-id57218439017
person.identifier.scopus-author-id57217314435
person.identifier.scopus-author-id57205642036
person.identifier.scopus-author-id57204744399
relation.isAuthorOfPublicationc5ea1931-1fa0-43b8-b476-af1256cdeb2c
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relation.isAuthorOfPublication.latestForDiscoveryc5ea1931-1fa0-43b8-b476-af1256cdeb2c

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