Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide

Edible oil refinery wastewater (EORW) is one source of environmental pollution in Nigeria. The treatment of EORW before discharge into the environment remains a significant challenge in the edible oil refinery industries. This research was aimed at photocatalytic treatment of EORW using a batch pho...

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Autores principales:	Eki T. Aisien, Felix A. Aisien
Formato:	article
Lenguaje:	EN
Publicado:	Academy of Science of South Africa 2021
Materias:	edible oil wastewater photocatalytic treatment physicochemical parameters titanium dioxide water quality standards Science Q Science (General) Q1-390 Social Sciences H Social sciences (General) H1-99
Acceso en línea:	https://doaj.org/article/a3a67b364dc8458e97aa45d8d218d3a2
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spelling	oai:doaj.org-article:a3a67b364dc8458e97aa45d8d218d3a22021-12-02T06:15:01ZPhotodegradation and kinetics of edible oil refinery wastewater using titanium dioxide10.17159/sajs.2021/104831996-7489https://doaj.org/article/a3a67b364dc8458e97aa45d8d218d3a22021-11-01T00:00:00Zhttps://sajs.co.za/article/view/10483https://doaj.org/toc/1996-7489 Edible oil refinery wastewater (EORW) is one source of environmental pollution in Nigeria. The treatment of EORW before discharge into the environment remains a significant challenge in the edible oil refinery industries. This research was aimed at photocatalytic treatment of EORW using a batch photocatalytic reactor with titanium dioxide photocatalyst. We investigated the physicochemical parameters: chemical oxygen demand (COD), biological oxygen demand (BOD5), oil and grease, phenol, chloride (Cl-), total suspended solids, sulfate (SO42-), and phosphate (PO43-) using American Public Health Association methods. The results showed that the reduction efficiency of the treated EORW with TiO2 catalyst ranged between 65.8% (PO43-) and 87.0% (COD), and the improvement in efficiency was 54.1% (pH) and 60.8% dissolved oxygen. However, the results showed no significant difference (p<0.05) in the control treatment without catalyst. The biodegradability of EORW increased from 0.196 to 0.32. It was observed that the optimum values were an initial EORW concentration of 100 mL/L, irradiation time of 90min, catalyst dose of 1.25 g/L, and an agitation speed of 900 rpm. The kinetics of the photodegradation process was well described by the pseudo-first-order equation (R2>0.96) and pseudo-second-order equation (R2>0.98). The intra-particle diffusion model fairly represented the diffusion mechanism with an R2 value of 0.806. The treated EORW met the most acceptable water quality standards for discharged effluent according to the maximum permissible limits of the Nigerian National Environmental Standards and Regulations Enforcement Agency. Significance: • Photocatalytic treatment of EORW gave negligible results in the absence of a photocatalyst. • The photocatalytic degradation of EORW improved its biodegradability. • Photocatalytic treatment of EORW significantly reduced the pollutants in the wastewater. • The pseudo-first-order equation (R2>0.96) Eki T. AisienFelix A. AisienAcademy of Science of South Africaarticleedible oil wastewaterphotocatalytic treatmentphysicochemical parameterstitanium dioxidewater quality standardsScienceQScience (General)Q1-390Social SciencesHSocial sciences (General)H1-99ENSouth African Journal of Science, Vol 117, Iss 11/12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	edible oil wastewater photocatalytic treatment physicochemical parameters titanium dioxide water quality standards Science Q Science (General) Q1-390 Social Sciences H Social sciences (General) H1-99
spellingShingle	edible oil wastewater photocatalytic treatment physicochemical parameters titanium dioxide water quality standards Science Q Science (General) Q1-390 Social Sciences H Social sciences (General) H1-99 Eki T. Aisien Felix A. Aisien Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
description	Edible oil refinery wastewater (EORW) is one source of environmental pollution in Nigeria. The treatment of EORW before discharge into the environment remains a significant challenge in the edible oil refinery industries. This research was aimed at photocatalytic treatment of EORW using a batch photocatalytic reactor with titanium dioxide photocatalyst. We investigated the physicochemical parameters: chemical oxygen demand (COD), biological oxygen demand (BOD5), oil and grease, phenol, chloride (Cl-), total suspended solids, sulfate (SO42-), and phosphate (PO43-) using American Public Health Association methods. The results showed that the reduction efficiency of the treated EORW with TiO2 catalyst ranged between 65.8% (PO43-) and 87.0% (COD), and the improvement in efficiency was 54.1% (pH) and 60.8% dissolved oxygen. However, the results showed no significant difference (p<0.05) in the control treatment without catalyst. The biodegradability of EORW increased from 0.196 to 0.32. It was observed that the optimum values were an initial EORW concentration of 100 mL/L, irradiation time of 90min, catalyst dose of 1.25 g/L, and an agitation speed of 900 rpm. The kinetics of the photodegradation process was well described by the pseudo-first-order equation (R2>0.96) and pseudo-second-order equation (R2>0.98). The intra-particle diffusion model fairly represented the diffusion mechanism with an R2 value of 0.806. The treated EORW met the most acceptable water quality standards for discharged effluent according to the maximum permissible limits of the Nigerian National Environmental Standards and Regulations Enforcement Agency. Significance: • Photocatalytic treatment of EORW gave negligible results in the absence of a photocatalyst. • The photocatalytic degradation of EORW improved its biodegradability. • Photocatalytic treatment of EORW significantly reduced the pollutants in the wastewater. • The pseudo-first-order equation (R2>0.96)
format	article
author	Eki T. Aisien Felix A. Aisien
author_facet	Eki T. Aisien Felix A. Aisien
author_sort	Eki T. Aisien
title	Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
title_short	Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
title_full	Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
title_fullStr	Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
title_full_unstemmed	Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
title_sort	photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide
publisher	Academy of Science of South Africa
publishDate	2021
url	https://doaj.org/article/a3a67b364dc8458e97aa45d8d218d3a2
work_keys_str_mv	AT ekitaisien photodegradationandkineticsofedibleoilrefinerywastewaterusingtitaniumdioxide AT felixaaisien photodegradationandkineticsofedibleoilrefinerywastewaterusingtitaniumdioxide
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Photodegradation and kinetics of edible oil refinery wastewater using titanium dioxide

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