Tannin-based coagulant for harvesting microalgae cultivated in wastewater: Efficiency, floc morphology and products characterization

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dc.contributor.authorTeixeira, Mariana Souza [UNESP]
dc.contributor.authorSperanza, Lais Galileu [UNESP]
dc.contributor.authorda Silva, Isabel Costacurta [UNESP]
dc.contributor.authorMoruzzi, Rodrigo Braga [UNESP]
dc.contributor.authorSilva, Gustavo Henrique Ribeiro [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-05-01T09:31:05Z
dc.date.available2022-05-01T09:31:05Z
dc.date.issued2022-02-10
dc.description.abstractTannin-based coagulants (TBCs) have the potential to be used to harvest microalgae cultivated at wastewater treatment plants. Their use would address the circular economy associated with the production of low-toxicity biomass and supernatant. Studies in this field are still scarce, and substantial gaps exist in the definitions of the flocculation process parameters. In this context, the objective of this work was to evaluate TBC performance as a natural coagulant for harvesting microalgae biomass grown in sanitary effluent digested in an up flow biofilter, as well establishing a path to enable recovery and reuse of wastewater nutrients. Classical removal techniques combined with image analysis and light scattering-based equipment were used to evaluate the coagulant performance, recovery efficiency, floc strength, and floc recovery compared to aluminum sulfate (AS). The results showed that TBC was able to efficiently harvest algal biomass from the effluent, achieving color, turbidity, and optical density (OD) removal efficiencies greater than 90% with only 5 min of sedimentation. The optimal harvesting dosage was 100 mg·L−1 for TBC and 75 mg·L−1 for AS. TBC presented the advantage of harvesting biomass without changing the pH of the medium and was also able to present satisfactory removal of the analyzed parameters (color, turbidity and OD) at pH values of 5.0, 7.0, and 8.5. In addition, TBC produced stronger flocs than AS, showing a better ability to resist breakage upon sudden shear rate variations. TBC produced macronutrient-rich biomass and supernatant that was similar to that produced with AS.en
dc.description.affiliationUniversidade Estadual de São Paulo Júlio de Mesquita Filho (UNESP), Campus de Bauru, Av. Eng. Luiz Edmundo C. Coube 14-01, Vargem Limpa
dc.description.affiliationAssociação Oceano Verde (GreenCoLab) Universidade do Algarve, Campus de Gambelas, Pavilhão B1, Gabinete H8
dc.description.affiliationUniversidade Estadual de São Paulo Júlio de Mesquita Filho (UNESP), Campus de Rio Claro, Avenida 24 A,1515, Bela Vista
dc.description.affiliationUnespUniversidade Estadual de São Paulo Júlio de Mesquita Filho (UNESP), Campus de Bauru, Av. Eng. Luiz Edmundo C. Coube 14-01, Vargem Limpa
dc.description.affiliationUnespUniversidade Estadual de São Paulo Júlio de Mesquita Filho (UNESP), Campus de Rio Claro, Avenida 24 A,1515, Bela Vista
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2018/18367-1
dc.description.sponsorshipIdCNPq: 301210/2018-7
dc.description.sponsorshipIdCNPq: 309064/2018-0
dc.description.sponsorshipIdCNPq: 427936/2018-7
dc.description.sponsorshipIdCAPES: 88887.310463/2018-00
dc.description.sponsorshipIdCAPES: 88887.468868/2019-00
dc.identifierhttp://dx.doi.org/10.1016/j.scitotenv.2021.150776
dc.identifier.citationScience of the Total Environment, v. 807.
dc.identifier.doi10.1016/j.scitotenv.2021.150776
dc.identifier.issn1879-1026
dc.identifier.issn0048-9697
dc.identifier.scopus2-s2.0-85116770794
dc.identifier.urihttp://hdl.handle.net/11449/233642
dc.language.isoeng
dc.relation.ispartofScience of the Total Environment
dc.sourceScopus
dc.subjectHarvesting
dc.subjectMicroalgae
dc.subjectNatural coagulant
dc.subjectTannin-based coagulant
dc.subjectWastewater treatment
dc.titleTannin-based coagulant for harvesting microalgae cultivated in wastewater: Efficiency, floc morphology and products characterizationen
dc.typeArtigo

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