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Wastewater treatment of biodiesel production using persulphate ion as an oxidant

2019Journal article Open access
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dc.contributor.authorBorralho, Maria
dc.contributor.authorPardal, Ana
dc.contributor.authorCoelho, Solange
dc.date.accessioned2019-06-11T10:55:34Z
dc.date.available2019-06-11T10:55:34Z
dc.date.issued2019
dc.description.abstractIntroduction: The production of biodiesel produces a highly polluting effluent, because presents high values of Chemical Oxygen Demand (COD), oils and fats, among other contaminants. Sodium persulphate is a powerful oxidant (Eº = 2.1V). In addition to the direct oxidation that is favored in alkaline media, it can be induced by photolytic processes, catalytic and / or catalytic photos forming sulphate radicals (Eº = 2.6 V) thus providing reaction mechanisms with free radicals like hydroxyl radicals. Methods: In this work the effect of the potassium monopersulphate compound (2KHSO5.KHSO4K2SO4), (Oxone) on the removal of COD in residual water from the biodiesel purification step was tested. Results: The tests, direct oxidation at alkaline pH and catalytic oxidation with cobalt ions, Co(II), showed that the former, for Oxone concentrations of 1.00x10-2 M and 4.00x10-3 M, were not effective because no decomposition occurred, for reaction times over three hours, thus not occurring removal of COD. In the catalytic assays combinations were tested, varying between 5.00x10-3 M and 7.50x10-2 M for the oxidant and 0.10 μM and 1.00 μM for the catalyst. The complete decomposition of the oxidant was always verified between 15 min. and 2 h. The tests with the lowest concentration of cobalt showed COD removal rates around 20% and the highest one reached 60%. Conclusions: The most favorable assay achieves significant COD removals, but not enough for the effluent to be discharged in the hydric medium according the portuguese legislation.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.29352/mill0208.02.00199pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.19/5524
dc.language.isoporpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstituto Politécnico de Viseupt_PT
dc.relation.publisherversionhttps://revistas.rcaap.pt/millenium/article/view/14590pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPotassium monopersulfatept_PT
dc.subjectChemical oxidationpt_PT
dc.subjectChemical Oxygen Demandpt_PT
dc.subjectWastewater from biodiesel purificationpt_PT
dc.titleWastewater treatment of biodiesel production using persulphate ion as an oxidantpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceViseupt_PT
oaire.citation.endPage27pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage21pt_PT
oaire.citation.titleMilleniumpt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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RE - Série 2, n.º 08: (2019)