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Enhanced CO2 Fixation Through Continuous Cultivation of Microalgae in a Two-Stage Photobioreactor System

2026-07Artigo científico Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.fosEngenharia e Tecnologia::Outras Engenharias e Tecnologias
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg12:Produção e Consumo Sustentáveis
datacite.subject.sdg13:Ação Climática
dc.contributor.authorTavares, João
dc.contributor.authorPaixão, Susana M.
dc.contributor.authorSilva, Tiago
dc.contributor.authorAlves, Luís
dc.date.accessioned2026-09-21T08:36:03Z
dc.date.available2026-09-21T08:36:03Z
dc.date.issued2026-07
dc.description.abstractABSTRACT: The integration of microalgae cultivation into biorefinery systems represents a promising strategy to enhance carbon dioxide (CO2) sequestration and support sustainable biomass production for diverse biotechnological applications. This study reports the CO2 fixation performance and biomass productivity of a two-stage photobioreactor (PBR) system employed for the continuous cultivation of Haematococcus pluvialis, utilizing biogenic CO2 generated from a heterotrophic culture. The first stage (ST1) operated as an autotrophic chemostat (ST1 PBR) with variable dilution rates (0.18–1.00 d−1), while the second stage (ST2) consisted of sequential high-irradiance columns that promoted biomass and carotenoid accumulation. The two-stage PBR (ST1 + ST2 PBR) achieved a maximum CO2 assimilation capacity of 0.747g/L/d and up to 94% CO2 fixation efficiency. The daily CO2 assimilation rate reached 6.53 g/d, representing a 10% improvement compared with the single-stage system (ST1 PBR). The maximum overall biomass productivity reached 0.332 g/L/d when both PBR stages were operated together, whereas the second stage alone achieved up to 1.18 g/L/d under continuous operation and a maximum biomass concentration of 3.33 g/L during batch-induced carotenogenesis. Nutrient uptake analysis revealed an increasing fraction of unconsumed major nutrients with higher dilution rates. Continuous operation under high irradiance did not induce pigment accumulation, whereas batch mode successfully triggered carotenogenesis over 13 days, resulting in visible pigment production and high biomass yield. Overall, the two-stage PBR system demonstrated high CO2 capture efficiency, enhanced biomass productivity, and operational flexibility, offering a scalable and sustainable approach for integrating microalgal cultivation into biorefineries while contributing to carbon mitigation and circular bioeconomy goals.eng
dc.identifier.citationTavares, J., Paixão, S. M., Silva, T. P., & Alves, L. (2026). Enhanced CO2 Fixation Through Continuous Cultivation of Microalgae in a Two-Stage Photobioreactor System. In: Molecules, 2026, vol. 31 (15), article 2627. https://doi.org/10.3390/molecules31152627
dc.identifier.doi10.3390/molecules31152627
dc.identifier.eissn1420-3049
dc.identifier.urihttp://hdl.handle.net/10400.9/6465
dc.language.isoeng
dc.peerreviewedyes
dc.publisherMDPI
dc.relationLow-emissions system towards green fuels and high added-value bioactive compounds production based on Gordonia alkanivorans strain 1B biorefinery
dc.relationBiomass and Bioenergy Research Infrastructure
dc.relation.hasversionhttps://www.mdpi.com/1420-3049/31/15/2627
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMicroalgae
dc.subjectBiomass
dc.subjectPhotobioreactors
dc.subjectBiorefinery
dc.subjectCircular bioeconomy
dc.titleEnhanced CO2 Fixation Through Continuous Cultivation of Microalgae in a Two-Stage Photobioreactor Systemeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberPTDC/EAM-AMB/30975/2017
oaire.awardNumberPINFRA/22059/2016
oaire.awardTitleLow-emissions system towards green fuels and high added-value bioactive compounds production based on Gordonia alkanivorans strain 1B biorefinery
oaire.awardTitleBiomass and Bioenergy Research Infrastructure
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FEAM-AMB%2F30975%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/9444 - RNIIIE/PINFRA%2F22059%2F2016/PT
oaire.citation.issue15
oaire.citation.titleMolecules
oaire.citation.volume31
oaire.fundingStream3599-PPCDT
oaire.fundingStream9444 - RNIIIE
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameTavares
person.familyNamePaixão
person.familyNameSilva
person.familyNameAlves
person.givenNameJoão
person.givenNameSusana M.
person.givenNameTiago
person.givenNameLuís
person.identifier.ciencia-id9B16-17EF-EBEE
person.identifier.ciencia-id7918-C133-C5FB
person.identifier.ciencia-idE418-9EE4-9BB4
person.identifier.ciencia-id561B-53A5-7359
person.identifier.orcid0000-0002-8671-0331
person.identifier.orcid0000-0003-0955-4467
person.identifier.orcid0000-0003-0120-557X
person.identifier.orcid0000-0001-6245-775X
person.identifier.ridA-4832-2018
person.identifier.scopus-author-id57201151914
person.identifier.scopus-author-id6603112228
person.identifier.scopus-author-id6701310833
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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