Repository logo
 
Publication

Insights into PCDD/Fs and PAHs in biomass boilers envisaging risks of ash use as fertilizers

2020Journal article Open access
Simple item page
dc.contributor.authorLopes, Helena
dc.contributor.authorProença, Susana
dc.date.accessioned2020-09-22T14:37:05Z
dc.date.available2020-09-22T14:37:05Z
dc.date.issued2020
dc.description.abstractABSTRACT: Since ashes are a possible source of Persistent Organic Pollutants (POPs) contamination, their application in soils must be subject to more study and control. In this scope, feed residual forest biomasses and biomass ashes, collected along one year in four biomass power stations, were characterized mainly for their polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and Polycyclic Aromatic Hydrocarbons (PAHs) contents. The biomasses present concerning levels of Cl (0.04-0.28%) that may lead to PCDD/Fs formation. The biomasses also contain OCDD (29-260 ng/kg) and 1,2,3,4,6,7,8-HpCDD (35 ng/kg) that may contribute to increased Toxic Equivalents (TEQs) of ashes, possibly involving dechlorination and ash enrichment mechanisms. While the WHO2005-TEQs in bottom ashes (14-20 ng TEQ/kg) reaches the proposed limit (20 ng TEQ/kg) for ash use as fertilizers, in fly ashes (35-1139 ng TEQ/kg) the limit is exceeded. PAHs are below 0.02 mg/kg in bottom ashes and 1.5-2.5 mg/kg in fly ashes, complying with the proposed limit of 6 mg/kg. As bottom and fly ash streams may contain different ash flows, a clear definition of ash mixes is required. Correlations between unburned carbon (C), PAHs and PCDD/Fs were not found, which highlights the need for compulsory PCDD/Fs analysis in ashes, independently of their origin, burnout degree or levels of other contaminants. A sensitivity analysis was performed to evaluate the impact of handling non-detected values, which showed more impact for TEQs values close to the proposed regulatory limit of PCDD/Fs. These findings highlight the need to define reporting protocols of analytical results for risk assessments and conformity evaluation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLopes, Helena... [et.al.] - Insights into PCDD/Fs and PAHs in biomass boilers envisaging risks of ash use as fertilizers. In: Applied Sciences, 2020, Vol. 10(14), article nº 4951pt_PT
dc.identifier.doi10.3390/app10144951pt_PT
dc.identifier.eissn2076-3417
dc.identifier.urihttp://hdl.handle.net/10400.9/3308
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relation.publisherversionhttps://doi.org/10.3390/app10144951pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectBiomasspt_PT
dc.subjectAshespt_PT
dc.subjectFluidised bedpt_PT
dc.subjectCombustionpt_PT
dc.subjectWaste valorizationpt_PT
dc.titleInsights into PCDD/Fs and PAHs in biomass boilers envisaging risks of ash use as fertilizerspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-AMB%2F098112%2F2008/PT
oaire.citation.issue14pt_PT
oaire.citation.titleApplied Sciencespt_PT
oaire.citation.volume10pt_PT
oaire.fundingStream5876-PPCDTI
person.familyNameLopes
person.givenNameHelena
person.identifier.orcid0000-0001-9378-5254
person.identifier.ridL-4824-2017
person.identifier.scopus-author-id18437851600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationab9b3ab7-7989-40cc-adb4-b2ace14451ca
relation.isAuthorOfPublication.latestForDiscoveryab9b3ab7-7989-40cc-adb4-b2ace14451ca
relation.isProjectOfPublicatione924665e-b3c3-485d-a2e6-fe424a943c8b
relation.isProjectOfPublication.latestForDiscoverye924665e-b3c3-485d-a2e6-fe424a943c8b

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
applsci-10-04951-v3.pdf
Size:
511.41 KB
Format:
Adobe Portable Document Format
Download

Collections

UB - Artigos em revistas internacionais