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

2022-10Journal article Restricted access
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dc.contributor.authorTeixeira, Mariana Souza
dc.contributor.authorGalileu Speranza, Lais
dc.contributor.authorda Silva, Isabel Costacurta
dc.contributor.authorMoruzzi, Rodrigo Braga
dc.contributor.authorSilva, Gustavo Henrique Ribeiro
dc.date.accessioned2023-03-13T11:09:30Z
dc.date.available2023-03-13T11:09:30Z
dc.date.issued2022-10
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. (C) 2021 Elsevier B.V. All rights reserved.pt_PT
dc.description.sponsorshipCoordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) 88887.310463/2018-00, 88887.468868/2019-00 , CAPES 001, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) 309064/2018-0 , 301210/2018-7, 427936/2018-7, Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) 2018/18367-1pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.scitotenv.2021.150776pt_PT
dc.identifier.eissn1879-1026
dc.identifier.urihttp://hdl.handle.net/10400.1/19228
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.subjectWastewater treatmentpt_PT
dc.subjectNatural coagulantpt_PT
dc.subjectTannin-based coagulantpt_PT
dc.subjectMicroalgaept_PT
dc.subjectHarvestingpt_PT
dc.titleTannin-based coagulant for harvesting microalgae cultivated in wastewater: Efficiency, floc morphology and products characterizationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage150776pt_PT
oaire.citation.titleScience of The Total Environmentpt_PT
oaire.citation.volume807pt_PT
person.familyNameGalileu Speranza
person.givenNameLais
person.identifier.ciencia-id8417-077A-0CBA
person.identifier.orcid0000-0001-5305-7543
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationb033bf62-e9bc-4018-8e3c-c8d01779f239
relation.isAuthorOfPublication.latestForDiscoveryb033bf62-e9bc-4018-8e3c-c8d01779f239

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