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Pilot-Scale cultivation of microalgae in blended effluents: C/N ratio management to boost biomass and biofuel precursors

2025-12Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia::Biotecnologia Ambiental
datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorSaleme Aona de Paula Pereira, Alexia
dc.contributor.authorSilva, Thiago
dc.contributor.authorMagalhães, Iara
dc.contributor.authorSantos, Weller Gabriel da Silva
dc.contributor.authorOliveira, Mateus Soares de
dc.contributor.authorReis, Alberto
dc.contributor.authorCouto, Eduardo de Aguiar
dc.contributor.authorCalijuri, Maria Lucia
dc.date.accessioned2025-12-10T10:01:55Z
dc.date.available2025-12-10T10:01:55Z
dc.date.issued2025-12
dc.description.abstractABSTRACT: Algal biotechnology offers a sustainable pathway for wastewater treatment and resource recovery. However, the low carbon-to-nitrogen (C/N) ratio in domestic wastewater often limits microalgal productivity, which may compromise process viability and, consequently, limit its application in bioproduct valorization routes. This study evaluated the effects of blending municipal wastewater (MW) with industrial wastewater from juice processing (IWJ) at different ratios on biomass production, biochemical composition, and pollutant removal. Pilot-scale experiments in outdoor high-rate algal ponds, operated without external carbon dioxide (CO2) supply (relying on inorganic carbon present in the wastewater and passive diffusion from air). These experiments tested three blends: T1 (60 % MW + 40 % IWJ, C/N 9.25), T2 (40 % MW + 60 % IWJ, C/N 25.31), and T3 (20 % MW + 80 % IWJ, C/N 52.71). T1 achieved the highest biomass productivity and lipid content (14.44 %, p < 0.05), while T3 presented the highest levels of saturated fatty acids C16:0 (40.39 %) and C18:0 (10.08 %), supporting its biodiesel potential. Carbohydrate accumulation was enhanced in T2 (18.44 %) and T3 (21.09 %) under nitrogen-limited conditions. Microalgal species composition varied significantly with the C/N ratio, indicating selective adaptation. Additionally, dissolved organic carbon removal followed first-order kinetics across treatments, confirming model applicability. These findings underscore the effectiveness of effluent blending and C/N adjustment to enhance biomass quality, pollutant removal, and suitability for biofuel production in integrated algal-based wastewater treatment systems.eng
dc.identifier.citationPereira, A., Silva, T., Magalhães, I., Santos, W., Oliveira, M., Reis, A., Couto, E. & Calijuri, M.L. (2025). Pilot-Scale cultivation of microalgae in blended effluents: C/N ratio management to boost biomass and biofuel precursors. In: Journal of Environmental Chemical Engineering, 2025, vol. 13(6), article 119910. https://doi.org/10.1016/j.jece.2025.119910
dc.identifier.doi10.1016/j.jece.2025.119910
dc.identifier.eissn2213-3437
dc.identifier.issn2213-2929
dc.identifier.urihttp://hdl.handle.net/10400.9/6155
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S221334372504607X?via%3Dihub
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMicroalgae
dc.subjectWastewater treatment
dc.subjectNutrient removal
dc.subjectBiomass valorisation
dc.titlePilot-Scale cultivation of microalgae in blended effluents: C/N ratio management to boost biomass and biofuel precursorseng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue6
oaire.citation.titleJournal of Environmental Chemical Engineering
oaire.citation.volume13
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameSaleme Aona de Paula Pereira
person.familyNameSilva
person.familyNameMagalhães
person.familyNameReis
person.familyNameCalijuri
person.givenNameAlexia
person.givenNameThiago
person.givenNameIara
person.givenNameAlberto
person.givenNameMaria Lucia
person.identifier.orcid0000-0002-0720-5098
person.identifier.orcid0000-0002-6108-8793
person.identifier.orcid0000-0002-0802-5996
person.identifier.orcid0000-0002-1405-9981
person.identifier.orcid0000-0002-0918-2475
person.identifier.ridAAW-5853-2020
person.identifier.ridAAU-5692-2020
person.identifier.ridG-1546-2012
person.identifier.scopus-author-id57205642036
person.identifier.scopus-author-id57218439017
person.identifier.scopus-author-id57217314435
person.identifier.scopus-author-id57204744399
relation.isAuthorOfPublicationc100e34a-5ab1-420c-b216-c5fd3f7e58ab
relation.isAuthorOfPublicationc5ea1931-1fa0-43b8-b476-af1256cdeb2c
relation.isAuthorOfPublication3427574e-7518-4cd4-9913-294f6d51b28b
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relation.isAuthorOfPublication.latestForDiscoveryc100e34a-5ab1-420c-b216-c5fd3f7e58ab

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