Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation

Abstract In the present study, an electrocoagulation process was applied to treat saline oilfield-produced water. The kinetics of simultaneous heavy metal and oil removal in the saline environment under different conditions including four-electrode materials of copper, zinc, iron, and aluminum, aera...

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Autores principales:	Mahdieh Mehri, Narges Fallah, Bahram Nasernejad
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/517dd5ff98544bd786a6d07c81f365a8
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spelling	oai:doaj.org-article:517dd5ff98544bd786a6d07c81f365a82021-12-02T17:19:17ZMechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation10.1038/s41545-021-00135-02059-7037https://doaj.org/article/517dd5ff98544bd786a6d07c81f365a82021-09-01T00:00:00Zhttps://doi.org/10.1038/s41545-021-00135-0https://doaj.org/toc/2059-7037Abstract In the present study, an electrocoagulation process was applied to treat saline oilfield-produced water. The kinetics of simultaneous heavy metal and oil removal in the saline environment under different conditions including four-electrode materials of copper, zinc, iron, and aluminum, aeration and agitation rate, oil content, and salinity was investigated. The nature of the electro-generated species and possible abatement mechanisms were explored and compared by using FE-SEM/EDS, FTIR, XRD, and BET analyses. At low and high salinities, cadmium adsorption followed Langmuir and Freundlich models, suggesting the transformation of identical adsorption sites to heterogeneous ones. Cadmium removal efficiencies of 99/73% were obtained at low/high salinity with iron and 99.9 and 82% using copper and zinc electrodes in a saline environment. The cadmium adsorption capacity of different anode materials exhibited the order of copper > zinc > iron > aluminum. The adsorption capacity was considerably reduced in saline condition due to more crystalline structure and lower surface area and porosity of the particles while it was enhanced by the oil, caused by structural changes including more uniform pores, the elevated surface area, and porosity. The COD removal yield of 89% for low salinity and 80/73% at high salinity with/without aeration were achieved by iron. The highest COD removal yield of about 95% was achieved by the aluminum electrodes, compared to 85 and 87% for copper and zinc electrodes. The main removal mechanisms were outer- and inner-sphere complexation, and surface precipitation.Mahdieh MehriNarges FallahBahram NasernejadNature PortfolioarticleWater supply for domestic and industrial purposesTD201-500ENnpj Clean Water, Vol 4, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Water supply for domestic and industrial purposes TD201-500
spellingShingle	Water supply for domestic and industrial purposes TD201-500 Mahdieh Mehri Narges Fallah Bahram Nasernejad Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
description	Abstract In the present study, an electrocoagulation process was applied to treat saline oilfield-produced water. The kinetics of simultaneous heavy metal and oil removal in the saline environment under different conditions including four-electrode materials of copper, zinc, iron, and aluminum, aeration and agitation rate, oil content, and salinity was investigated. The nature of the electro-generated species and possible abatement mechanisms were explored and compared by using FE-SEM/EDS, FTIR, XRD, and BET analyses. At low and high salinities, cadmium adsorption followed Langmuir and Freundlich models, suggesting the transformation of identical adsorption sites to heterogeneous ones. Cadmium removal efficiencies of 99/73% were obtained at low/high salinity with iron and 99.9 and 82% using copper and zinc electrodes in a saline environment. The cadmium adsorption capacity of different anode materials exhibited the order of copper > zinc > iron > aluminum. The adsorption capacity was considerably reduced in saline condition due to more crystalline structure and lower surface area and porosity of the particles while it was enhanced by the oil, caused by structural changes including more uniform pores, the elevated surface area, and porosity. The COD removal yield of 89% for low salinity and 80/73% at high salinity with/without aeration were achieved by iron. The highest COD removal yield of about 95% was achieved by the aluminum electrodes, compared to 85 and 87% for copper and zinc electrodes. The main removal mechanisms were outer- and inner-sphere complexation, and surface precipitation.
format	article
author	Mahdieh Mehri Narges Fallah Bahram Nasernejad
author_facet	Mahdieh Mehri Narges Fallah Bahram Nasernejad
author_sort	Mahdieh Mehri
title	Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
title_short	Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
title_full	Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
title_fullStr	Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
title_full_unstemmed	Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
title_sort	mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/517dd5ff98544bd786a6d07c81f365a8
work_keys_str_mv	AT mahdiehmehri mechanismsofheavymetalandoilremovalfromsyntheticsalineoilfieldproducedwaterbyelectrocoagulation AT nargesfallah mechanismsofheavymetalandoilremovalfromsyntheticsalineoilfieldproducedwaterbyelectrocoagulation AT bahramnasernejad mechanismsofheavymetalandoilremovalfromsyntheticsalineoilfieldproducedwaterbyelectrocoagulation
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Mechanisms of heavy metal and oil removal from synthetic saline oilfield produced water by electrocoagulation

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