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A circular approach for landfill leachate treatment: Chemical precipitation with biomass ash followed by bioremediation through microalgae

2021-06Journal article Restricted access
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dc.contributor.authorViegas, Catarina
dc.contributor.authorNobre, Catarina
dc.contributor.authorMota, Andre
dc.contributor.authorVilarinho, Candida
dc.contributor.authorGouveia, Luisa
dc.contributor.authorGoncalves, Margarida
dc.date.accessioned2021-09-08T10:57:52Z
dc.date.available2021-09-08T10:57:52Z
dc.date.issued2021-06
dc.description.abstractThe aim of this work was to study an integrated approach for landfill leachate remediation comprising chemical precipitation with biomass bottom ash as a pre-treatment to reduce color and turbidity followed by bioremediation through microalgae treatment for effluent disposal. Optimal pre-treatment conditions were determined through batch experiments and were found to be 160 g L-1 ash dose, 96 h of contact time, overhead agitation at 15 rpm and ash particle size below 500 mu m. These conditions led to removal efficiencies of 74.3% for chemical oxygen demand and 98.5% for color. Large quantities of sludge containing excess biomass ash and precipitated compounds were formed during the pre-treatment. To minimize solid disposal, this sludge was tested as a raw material for cementitious and aggregate substitute in mortar formulations. Following the pre-treatment, the leachate was inoculated with six different microalgae species to evaluate their ability to grow in such a recalcitrant effluent and remediate it. After a period of 27 days biomass concentration from 0.4 to 1.2 g L-1 were achieved for the tested microalgae. Removal efficiencies were in the range of 18-62% for COD, 63-71% for N, and 15-100% for P. At the end of the treatment, algal biomass was characterized regarding protein, lipid, fatty acids, carbohydrate, and ash contents. This approach allows a low-cost remediation of these recalcitrant effluents when compared with the present options that include inverse osmosis, and the valorization of ash-rich precipitates and microalgae biomass improves the sustainability of the overall process.
dc.description.sponsorshipCITRI, S.A. project IDT [24878]; FCT - Fundacao para a Ciencia e TecnologiaPortuguese Foundation for Science and Technology [SFRH/BD/131178/2017, UIDP/04077/2020]; Operational Programme for Competitiveness and Internationalization (COMPETE2020) [Lisboa-01-0247-FEDER-035234]; Lisbon Portugal Regional Operational Programme (Lisboa 2020); Algarve Regional Operational Programme (Algarve 2020) under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); RENUWAL - Red Iberoamericana para el Tratamiento de Efluentes con Microalgas [Red CYTED P319RT0025]
dc.identifier.doi10.1016/j.jece.2021.105187
dc.identifier.issn2213-3437
dc.identifier.urihttp://hdl.handle.net/10400.1/16960
dc.language.isoeng
dc.peerreviewedyes
dc.publisherELSEVIER SCI LTD
dc.subjectLandfill leachate treatment
dc.subjectBottom ash
dc.subjectPrecipitation
dc.subjectMortars
dc.subjectMicroalgae
dc.subjectWastewater treatment
dc.subject.otherEngineering
dc.titleA circular approach for landfill leachate treatment: Chemical precipitation with biomass ash followed by bioremediation through microalgae
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/68119/PT
oaire.citation.issue3
oaire.citation.startPage105187
oaire.citation.titleJournal of Environmental Chemical Engineering
oaire.citation.volume9
oaire.fundingStreamOE
person.familyNameGouveia
person.givenNameLuisa
person.identifierH-4046-2011
person.identifier.ciencia-id581B-924A-84DD
person.identifier.orcid0000-0003-0196-6360
person.identifier.scopus-author-id7004135834
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscoveryf559d57b-b659-4d65-bf6c-698bf99e729b
relation.isProjectOfPublication61dbc78d-e788-4b36-8be5-384b4684c694
relation.isProjectOfPublication.latestForDiscovery61dbc78d-e788-4b36-8be5-384b4684c694

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