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Scale-Up of Semi-Continuous Anaerobic Co-Digestion of Municipal Mixed Sludge with Fruit and Vegetable Waste

2026-06-25Artigo científico Acesso aberto
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dc.contributor.authorAzevedo, André
dc.contributor.authorLapa, Nuno
dc.contributor.authorMoldão, Margarida
dc.contributor.authorDuarte, Elizabeth
dc.contributor.institutionDQ - Departamento de Química
dc.contributor.institutionLAQV@REQUIMTE
dc.contributor.pblMDPI - Multidisciplinary Digital Publishing Institute
dc.date.accessioned2026-08-19T14:18:01Z
dc.date.available2026-08-19T14:18:01Z
dc.date.issued2026-06-25
dc.descriptionFunding information: This research was funded by national funds from FCT—Fundação para a Ciência e a Tecnologia, I.P., through the doctoral scholarship “UI/BD/151370/2021” attributed to André Azevedo, under the project UIDB/04129/2020 (https://doi.org/10.54499/UIDB/04129/2020) and UID/04129/2025 (https://doi.org/10.54499/UID/04129/2025) of LEAF (Linking Landscape, Environment, Agriculture and Food Research Unit), LA/P/0092/2020 (https://doi.org/10.54499/LA/P/0092/2020) of Associate Laboratory TERRA and by national funds from FCT—Fundação para a Ciência e a Tecnologia, I.P., under the scope of the projects UID/50006/2025, UID/PRR/50006/2025 and LA/P/0008/2020 of the Associated Laboratory for Green Chemistry—LAQV REQUIMTE (https://doi.org/10.54499/UID/50006/2025, https://doi.org/10.54499/UID/PRR/50006/2025 and https://doi.org/10.54499/LA/P/0008/2020). The authors acknowledge Fundação para a Ciência e a Tecnologia; LEAF—Linking Landscape, Environment, Agriculture and Food Research Unit; Associate Laboratory TERRA and LAQV—Associated Laboratory for Green Chemistry—for allowing the necessary conditions for the development of the current work.
dc.description.abstractAnaerobic co-digestion (AcoD) is a promising strategy to enhance biogas production and improve the sustainability of wastewater treatment plants (WWTPs). However, information regarding process scale-up and reactor performance following the interruption of cosubstrate feeding remains limited. This study evaluated the anaerobic co-digestion of municipal mixed sludge (MMS) and fruit and vegetable peel purées (FVPP) in a 10.6 L semicontinuously fed continuously stirred tank reactor (CSTR), operating under conditions representative of municipal WWTP anaerobic digesters. Mono-digestion (AMD) and codigestion (AcoD) assays were conducted under mesophilic conditions and assessed through process performance indicators. AcoD increased methane concentration from 58.50% to 60.75%, while total volatile solids (TVS) removal efficiency increased from 41.67% to 59.84% in comparison with AMD. Total chemical oxygen demand (CODT) removal efficiency also improved from 40.82% to 56.48%. Furthermore, H2S concentrations decreased from approximately 350 ppmv during mono-digestion to 7 ppmv during co-digestion. An additional mono-digestion trial (aAMD) performed after co-substrate withdrawal achieved the highest specific methane production (0.27 L CH4/g−1 TVS) and organic matter removal efficiencies (63.73% for TVS and 67.55% for CODT, respectively). These results demonstrate that co-digestion of MMS and FVPP improves methane quality, enhances organic matter removal, and reduces H2S emissions, while maintaining stable reactor performance under scale-up conditions and after the interruption of co-substrate feeding.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent19
dc.format.extent7010924
dc.identifier.doi10.3390/en19132998
dc.identifier.issn1996-1073
dc.identifier.otherPURE: 166139194
dc.identifier.otherPURE UUID: a583cf05-9749-47f9-9317-f714543812d9
dc.identifier.otherORCID: /0000-0001-7862-7477/work/218784923
dc.identifier.otherScopus: 105044553435
dc.identifier.urihttp://hdl.handle.net/10362/205525
dc.identifier.urlhttps://doi.org/10.3390/en19132998
dc.language.isoeng
dc.peerreviewedyes
dc.relationinfo:eu-repo/grantAgreement/FCT//UI%2FBD%2F151370%2F2021/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F04129%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Avaliação UID 2023%2F2024/UID%2F04129%2F2025/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Concurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)/LA%2FP%2F0092%2F2020/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Avaliação UID 2023%2F2024/UID%2F50006%2F2025/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Avaliação UID 2023%2F2024 PRR/UID%2FPRR%2F50006%2F2025/PT
dc.relationinfo:eu-repo/grantAgreement/FCT/Concurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)/LA%2FP%2F0008%2F2020/PT
dc.subjectSDG 11 - Sustainable Cities and Communities
dc.titleScale-Up of Semi-Continuous Anaerobic Co-Digestion of Municipal Mixed Sludge with Fruit and Vegetable Wasteen
dc.title.subtitleProcess Performance and Stabilityen
dc.typejournal article
degois.publication.issue13
degois.publication.titleEnergies
degois.publication.volume19
dspace.entity.typePublication
rcaap.rightsopenAccess

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