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Optimization of Biochar Production by Co-Torrefaction of Microalgae and Lignocellulosic Biomass Using Response Surface Methodology

2021-11Journal article Open access
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dc.contributor.authorViegas, Catarina
dc.contributor.authorNobre, Catarina
dc.contributor.authorCorreia, Ricardo
dc.contributor.authorGouveia, Luisa
dc.contributor.authorGonçalves, Maria Margarida
dc.date.accessioned2021-12-14T16:15:03Z
dc.date.available2021-12-14T16:15:03Z
dc.date.issued2021-11
dc.description.abstractABSTRACT: Co-torrefaction of microalgae and lignocellulosic biomass was evaluated as a method to process microalgae sludge produced from various effluents and to obtain biochars with suitable properties for energy or material valorization. The influence of four independent variables on biochar yield and properties was evaluated by a set of experiments defined by response surface methodology (RSM). The biochars were characterized for proximate and ultimate composition, HHV, and methylene blue adsorption capacity. HHV of the biochars was positively correlated with carbonization temperature, residence time, and lignocellulosic biomass content in the feed. Co-torrefaction conditions that led to a higher yield of biochar (76.5%) with good calorific value (17.4 MJ Kg(-1)) were 250 & DEG;C, 60 min of residence time, 5% feed moisture, and 50% lignocellulosic biomass. The energy efficiency of the process was higher for lower temperatures (92.6%) but decreased abruptly with the increase of the moisture content of the feed mixture (16.9 to 57.3% for 70% moisture). Biochars produced using algal biomass grown in contaminated effluents presented high ash content and low calorific value. Dye removal efficiency by the produced biochars was tested, reaching 95% methylene blue adsorption capacity for the biochars produced with the least severe torrefaction conditions.Co-torrefaction of microalgae and lignocellulosic biomass was evaluated as a method to process microalgae sludge produced from various effluents and to obtain biochars with suitable properties for energy or material valorization. The influence of four independent variables on biochar yield and properties was evaluated by a set of experiments defined by response surface methodology (RSM). The biochars were characterized for proximate and ultimate composition, HHV, and methylene blue adsorption capacity. HHV of the biochars was positively correlated with carbonization temperature, residence time, and lignocellulosic biomass content in the feed. Co-torrefaction conditions that led to a higher yield of biochar (76.5%) with good calorific value (17.4 MJ Kg(-1)) were 250 & DEG;C, 60 min of residence time, 5% feed moisture, and 50% lignocellulosic biomass. The energy efficiency of the process was higher for lower temperatures (92.6%) but decreased abruptly with the increase of the moisture content of the feed mixture (16.9 to 57.3% for 70% moisture). Biochars produced using algal biomass grown in contaminated effluents presented high ash content and low calorific value. Dye removal efficiency by the produced biochars was tested, reaching 95% methylene blue adsorption capacity for the biochars produced with the least severe torrefaction conditions.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationViegas, Catarina... [et.al.] - Optimization of Biochar Production by Co-Torrefaction of Microalgae and Lignocellulosic Biomass Using Response Surface Methodology. In: Energies, 2021, Vol. 14 (21), article nº 7330pt_PT
dc.identifier.doi10.3390/en14217330pt_PT
dc.identifier.eissn1996-1073
dc.identifier.urihttp://hdl.handle.net/10400.9/3633
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationBiorremediação de efluentes agroindustriais por microalgas e valorização da biomassa algal numa economia circular
dc.relationMechanical Engineering and Resource Sustainability Center
dc.relation.publisherversionhttps://doi.org/10.3390/en14217330pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectMicroalgaept_PT
dc.subjectChlorella Vulgarispt_PT
dc.subjectLignocellulosic biomasspt_PT
dc.subjectWaste valorizationpt_PT
dc.titleOptimization of Biochar Production by Co-Torrefaction of Microalgae and Lignocellulosic Biomass Using Response Surface Methodologypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleBiorremediação de efluentes agroindustriais por microalgas e valorização da biomassa algal numa economia circular
oaire.awardTitleMechanical Engineering and Resource Sustainability Center
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F131178%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04077%2F2020/PT
oaire.citation.issue21pt_PT
oaire.citation.titleEnergiespt_PT
oaire.citation.volume14pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameViegas
person.familyNameNobre
person.familyNameCorreia
person.familyNameGouveia
person.familyNameGonçalves
person.givenNameCatarina
person.givenNameCatarina
person.givenNameRicardo
person.givenNameLuisa
person.givenNameMargarida
person.identifierH-4046-2011
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person.identifier.orcid0000-0003-0196-6360
person.identifier.orcid0000-0002-0940-519X
person.identifier.scopus-author-id57002877600
person.identifier.scopus-author-id57191708537
person.identifier.scopus-author-id7004135834
person.identifier.scopus-author-id55421400300
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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