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Development of a bench-scale photobioreactor with a novel recirculation system for continuous cultivation of microalgae

2023-02Journal article Embargoed access
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dc.contributor.authorTavares, João
dc.contributor.authorSilva, Tiago
dc.contributor.authorPaixão, Susana M.
dc.contributor.authorAlves, Luís
dc.date.accessioned2023-03-03T10:47:04Z
dc.date.embargo2026-04
dc.date.issued2023-02
dc.description.abstractABSTRACT: Microalgae cultivation can be used to increase the sustainability of carbon emitting processes, converting the CO2 from exhaust gases into fuels, food and chemicals. Many of the carbon emitting industries operate in a continuous manner, for periods that can span days or months, resulting in a continuous stream of gas emissions. Biogenic CO2 from industrial microbiological processes is one example, since in many cases it becomes unsustainable to stop these processes on a daily or weekly basis. To correctly sequester these emissions, microalgae systems must be operated under continuous constant conditions, requiring photobioreactors (PBRs) that can act as chemostats for long periods of time. However, in order to optimize culture parameters or study metabolic responses, bench-scale setups are necessary. Currently there is a lack of studies and design alternatives using chemostat, since most works focus on batch assays or semi-continuous cultures. Therefore, this work focused on the development of a continuous bench-scale PBR, which combines a retention vessel, a photocollector and a degasser, with an innovative recirculation system, that allows it to operate as an autotrophic chemostat, to study carbon sequestration from a biogenic CO2-rich constant air stream. To assess its applicability, the PBR was used to cultivate the green microalga Haematococcus pluvialis using as sole carbon source the CO2 produced by a coupled heterotrophic bacterial chemostat. An air stream containing ≈0.35 vol% of CO2, was fed to the system, and it was evaluated in terms of stability, carbon fixation and biomass productivity, for dilution rates ranging from 0.1 to 0.5 d−1. The PBR was able to operate under chemostat conditions for more than 100 days, producing a stable culture that generated proportional responses to the stimuli it was subjected to, attaining a maximum biomass productivity of 183 mg/L/d with a carbon fixation efficiency of ≈39% at 0.3 d−1. These results reinforce the effectiveness of the developed PBR system, making it suitable for laboratory-scale studies of continuous photoautotrophic microalgae cultivation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationTavares, João... [et.al.] - Development of a bench-scale photobioreactor with a novel recirculation system for continuous cultivation of microalgae. In: Journal of Environmental Management, 2023, vol. 332, article nº 117418pt_PT
dc.identifier.doi10.1016/j.jenvman.2023.117418pt_PT
dc.identifier.issn0301-4797
dc.identifier.urihttp://hdl.handle.net/10400.9/4019
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationLow-emissions system towards green fuels and high added-value bioactive compounds production based on Gordonia alkanivorans strain 1B biorefinery
dc.relationZero emissions system for fossil fuel desulfurization using Gordonia alkanivorans strain 1B
dc.relation.publisherversionhttps://doi.org/10.1016/j.jenvman.2023.117418pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMicroalgaept_PT
dc.subjectHaematococcus pluvialispt_PT
dc.subjectContinuous culturept_PT
dc.subjectChemostatpt_PT
dc.subjectBiogenic CO2pt_PT
dc.subjectCO2 sequestrationpt_PT
dc.titleDevelopment of a bench-scale photobioreactor with a novel recirculation system for continuous cultivation of microalgaept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLow-emissions system towards green fuels and high added-value bioactive compounds production based on Gordonia alkanivorans strain 1B biorefinery
oaire.awardTitleZero emissions system for fossil fuel desulfurization using Gordonia alkanivorans strain 1B
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FEAM-AMB%2F30975%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F104977%2F2014/PT
oaire.citation.titleJournal of Environmental Managementpt_PT
oaire.citation.volume332pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameTavares
person.familyNameSilva
person.familyNamePaixão
person.familyNameAlves
person.givenNameJoão
person.givenNameTiago
person.givenNameSusana M.
person.givenNameLuís
person.identifier.ciencia-id9B16-17EF-EBEE
person.identifier.ciencia-idE418-9EE4-9BB4
person.identifier.ciencia-id7918-C133-C5FB
person.identifier.ciencia-id561B-53A5-7359
person.identifier.orcid0000-0002-8671-0331
person.identifier.orcid0000-0003-0120-557X
person.identifier.orcid0000-0003-0955-4467
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
rcaap.rightsembargoedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicatione2e5eb3c-86c4-462e-aad4-2e51fba624bf
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