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Conventional water treatment improvement through enhanced conventional and hybrid membrane processes to remove Ag, CuO and TiO2 nanoparticles mixture in surface waters

2020-10Journal article Restricted access
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dc.contributor.authorSerrão Sousa, Vânia
dc.contributor.authorRibau Teixeira, Margarida
dc.date.accessioned2021-06-24T11:35:14Z
dc.date.available2021-06-24T11:35:14Z
dc.date.issued2020-10
dc.description.abstractThis study proposes, for the first time, to improve the most used process in water treatment, conventional coagulation (coagulation/flocculation/sedimentation, C/F/S), to maximally remove a mixture of engineered nanoparticles (ENPs) from surface waters. Thus, conventional coagulation enhanced with powdered activated carbon (C/F/S + PAC) and hybrid membrane treatment, integrating conventional C/F/S with ultrafiltration (C/F/S. UF), were optimised to maximise the removal of a mixture of ENPs (TiO2, CuO and Ag, 1:1:1) from surface waters. Results demonstrated that both optimized C/F/S + PAC and C/F/S. UF improved the removal of the metal-based ENPs in mixture, compared to conventional C/F/S, from hydrophilic natural waters with low and medium turbidity. In C/F/S + PAC treatment, Ag, Cu and Ti removal efficiencies were higher than 99%, and only ca. 3.0-2.9 mu g Ag/L and 2.0-2.5 mu g Cu/L were found in waters, while Ti concentrations were below the detection limit, representing a significant improvement to C/F/S performance, where in same situations the residual concentrations reached the 16 mu g/L. In this treatment, PAC acted as an adsorbent and also enhanced the settleability of the aggregates (ENPs-natural organic matter (NOM)) formed during C/F. In the C/F/S. UF, at 90% of water recovery rate, Ti and Cu removal efficiencies were approximately 100%, but ca. 5.0-7.0 mu g/L of Ag were found in the permeate water. After C/F/S, the Ti/Cu-NOM aggregates were removed by UF membranes, due to the size exclusion mechanism but, because of some Ag dissolution, the ionic Ag passed through the membrane pores. Overall, the processes optimisation to the ENPs removal did not affect their ability to remove other target compounds (turbidity, dissolved organic carbon, specific UV absorbance and aluminium).
dc.description.sponsorshipPortuguese Foundation of Science and Technology, through the European Social Found from European Union [SFRH/BD/100402/2014]
dc.description.sponsorshipCENSE Center for Environmental and Sustainability Research [UID/AMB/04085/2019]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.seppur.2020.117047
dc.identifier.issn1383-5866
dc.identifier.urihttp://hdl.handle.net/10400.1/16378
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectEngineered nanoparticles
dc.subjectConventional coagulation
dc.subjectActivated carbon
dc.subjectUltrafiltration
dc.subjectWater treatment
dc.subjectWater management
dc.subject.otherEngineering
dc.titleConventional water treatment improvement through enhanced conventional and hybrid membrane processes to remove Ag, CuO and TiO2 nanoparticles mixture in surface waters
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage117047
oaire.citation.titleSeparation and Purification Technology
oaire.citation.volume248
person.familyNameSerrão Sousa
person.familyNameRibau Teixeira
person.givenNameVânia
person.givenNameMargarida
person.identifier.ciencia-id3D18-B03F-52FB
person.identifier.ciencia-id9111-87FB-26AA
person.identifier.orcid0000-0002-3800-1688
person.identifier.orcid0000-0002-2153-3282
person.identifier.ridB-9012-2012
person.identifier.scopus-author-id8988625600
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublication6f5ba6dd-2326-47fb-a278-85ce38b81c64
relation.isAuthorOfPublicationadfcbe65-54a7-4cce-b874-bb8e2bdc6167
relation.isAuthorOfPublication.latestForDiscoveryadfcbe65-54a7-4cce-b874-bb8e2bdc6167

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