Impacts of coagulation-flocculation treatment on the size distribution and bioavailability of trace metals (Cu, Pb, Ni, Zn) in municipal wastewater

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dc.contributor.authorHargreaves, Andrew J.
dc.contributor.authorVale, Peter
dc.contributor.authorWhelan, Jonathan
dc.contributor.authorAlibardi, Luca
dc.contributor.authorConstantino, Carlos
dc.contributor.authorDotro, Gabriela
dc.contributor.authorCartmell, Elise
dc.contributor.authorCampo, Pablo
dc.date.accessioned2017-12-18T15:03:31Z
dc.date.available2017-12-18T15:03:31Z
dc.date.issued2017-10-25
dc.description.abstractThis study investigated the impact of coagulation-flocculation treatment on metal form and bioavailability in municipal wastewater. Real humus effluent samples were separated into particulate, colloidal and truly dissolved fractions before and after treatment with either ferric chloride (FeCl3) or the biopolymer Floculan. Results revealed that both reagents effectively (≥48%) eliminated Cu, Pb and Zn from the particulate fraction and removed Cu and Zn from the colloidal fraction in conjunction with colloidal organic carbon (COC). Although organics in the truly dissolved fraction were resistant to removal, Floculan reduced Cu in this fraction by 72% owing to the complexation of free Cu ions to phenol and amino groups along the polymeric chains, revealing an additional removal pathway. In fact, COC removed in the CF process by Floculan was replaced with truly dissolved compounds, input as a result of this reagents organic composition. Floculan, therefore, reduced the soluble concentration of Cu and Zn without changing the DOC concentration, thus reducing the bioavailability of these metals in treated effluent. FeCl3 did not reduce the bioavailability of target metals, thus did not deliver any environmental benefit. This work provides important information for the selection and development of high performance coagulants to improve metal removal.en_UK
dc.identifier.citationHargreaves A, Vale P, Whelan J, (2018) Impacts of coagulation-flocculation treatment on the size distribution and bioavailability of trace metals (Cu, Pb, Ni, Zn) in municipal wastewater. Water Research, Volume 128, January 2018, pp. 120-128en_UK
dc.identifier.cris18898861
dc.identifier.issn0043-1354
dc.identifier.urihttp://dx.doi.org/10.1016/j.watres.2017.10.050
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk:8080/handle/1826/12779
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectParticle fractionsen_UK
dc.subjectColloidsen_UK
dc.subjectWastewateren_UK
dc.subjectBioavailabilityen_UK
dc.subjectCoagulationen_UK
dc.titleImpacts of coagulation-flocculation treatment on the size distribution and bioavailability of trace metals (Cu, Pb, Ni, Zn) in municipal wastewateren_UK
dc.typeArticleen_UK

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