Wastewater treatment of biodiesel production using persulphate ion as an oxidant.

Introduction: 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...

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Autores principales:	Maria Teresa Borralho, Ana Pardal, Solange Coelho
Formato:	article
Lenguaje:	EN PT
Publicado:	Instituto Politécnico de Viseu 2019
Materias:	Potassium monopersulfate Chemical oxidation Chemical Oxygen Demand Wastewater from biodiesel purification Special aspects of education LC8-6691 Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/9b28814cf4fe4ec69dddbdd2c2a43a2a
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spelling	oai:doaj.org-article:9b28814cf4fe4ec69dddbdd2c2a43a2a2021-12-02T11:41:47ZWastewater treatment of biodiesel production using persulphate ion as an oxidant.0873-30151647-662X10.29352/mill0208.02.00199https://doaj.org/article/9b28814cf4fe4ec69dddbdd2c2a43a2a2019-01-01T00:00:00Zhttps://revistas.rcaap.pt/millenium/article/view/14590https://doaj.org/toc/0873-3015https://doaj.org/toc/1647-662XIntroduction: 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.Maria Teresa BorralhoAna PardalSolange CoelhoInstituto Politécnico de ViseuarticlePotassium monopersulfateChemical oxidationChemical Oxygen DemandWastewater from biodiesel purificationSpecial aspects of educationLC8-6691Public aspects of medicineRA1-1270ENPTMillenium, Iss 8, Pp 21-27 (2019)
institution	DOAJ
collection	DOAJ
language	EN PT
topic	Potassium monopersulfate Chemical oxidation Chemical Oxygen Demand Wastewater from biodiesel purification Special aspects of education LC8-6691 Public aspects of medicine RA1-1270
spellingShingle	Potassium monopersulfate Chemical oxidation Chemical Oxygen Demand Wastewater from biodiesel purification Special aspects of education LC8-6691 Public aspects of medicine RA1-1270 Maria Teresa Borralho Ana Pardal Solange Coelho Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
description	Introduction: 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.
format	article
author	Maria Teresa Borralho Ana Pardal Solange Coelho
author_facet	Maria Teresa Borralho Ana Pardal Solange Coelho
author_sort	Maria Teresa Borralho
title	Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
title_short	Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
title_full	Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
title_fullStr	Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
title_full_unstemmed	Wastewater treatment of biodiesel production using persulphate ion as an oxidant.
title_sort	wastewater treatment of biodiesel production using persulphate ion as an oxidant.
publisher	Instituto Politécnico de Viseu
publishDate	2019
url	https://doaj.org/article/9b28814cf4fe4ec69dddbdd2c2a43a2a
work_keys_str_mv	AT mariateresaborralho wastewatertreatmentofbiodieselproductionusingpersulphateionasanoxidant AT anapardal wastewatertreatmentofbiodieselproductionusingpersulphateionasanoxidant AT solangecoelho wastewatertreatmentofbiodieselproductionusingpersulphateionasanoxidant
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Wastewater treatment of biodiesel production using persulphate ion as an oxidant.

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