Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems

Response surface methodology was investigated to determine the operational parameters on the degradation of Congo red dye (CR) and chemical oxygen demand (COD) in two electrochemical systems evaluated individually on effluent pretreated by an up-flow anaerobic sludge blanket (UASB) reactor. The UASB...

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Autores principales:	Itzel Celeste Romero-Soto, Celestino García-Gómez, Luis Humberto Álvarez-Valencia, Edna Rosalba Meza-Escalante, Luis Alonso Leyva-Soto, Maria Angeles Camacho-Ruiz, María Olga Concha-Guzmán, Ruth Gabriela Ulloa-Mercado, Lourdes Mariana Díaz-Tenorio, Pablo Gortáres-Moroyoqui
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	azo dye electrooxidation electrocoagulation Congo red UASB wastewater Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/84a22ce75bce49e2b03a71d5cf6d8224
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spelling	oai:doaj.org-article:84a22ce75bce49e2b03a71d5cf6d82242021-11-11T19:56:51ZSequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems10.3390/w132130872073-4441https://doaj.org/article/84a22ce75bce49e2b03a71d5cf6d82242021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3087https://doaj.org/toc/2073-4441Response surface methodology was investigated to determine the operational parameters on the degradation of Congo red dye (CR) and chemical oxygen demand (COD) in two electrochemical systems evaluated individually on effluent pretreated by an up-flow anaerobic sludge blanket (UASB) reactor. The UASB reactor was fed with 100 mg L<sup>−1</sup> of CR and was operated for 12 weeks at different hydraulic residence times (HRTs) of 12 h, 10 h, and 8 h. Once stabilized at an HRT of 8 h, the effluent was collected, homogenized, and independently treated by electrooxidation (EO) and electrocoagulation (EC) cells. On both electrochemical systems, two electrode pairs were used; solid for EC (Fe and stainless-steel) and mesh electrodes for EO (Ti/PbO<sub>2</sub> and Ti), and the effect of intensity (A), recirculation flow rate (mL min<sup>−1</sup>), and experimental time (min) was optimized on response variables. The maximum efficiencies of sequential systems for COD degradation and CR decolorization were 92.78% and 98.43% by EC and ≥99.84% and ≥99.71% by EO, respectively. Results indicate that the coupled systems can be used in textile industry wastewater treatment for the removal of dyes and the decolorized by-products.Itzel Celeste Romero-SotoCelestino García-GómezLuis Humberto Álvarez-ValenciaEdna Rosalba Meza-EscalanteLuis Alonso Leyva-SotoMaria Angeles Camacho-RuizMaría Olga Concha-GuzmánRuth Gabriela Ulloa-MercadoLourdes Mariana Díaz-TenorioPablo Gortáres-MoroyoquiMDPI AGarticleazo dyeelectrooxidationelectrocoagulationCongo redUASBwastewaterHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3087, p 3087 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	azo dye electrooxidation electrocoagulation Congo red UASB wastewater Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	azo dye electrooxidation electrocoagulation Congo red UASB wastewater Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Itzel Celeste Romero-Soto Celestino García-Gómez Luis Humberto Álvarez-Valencia Edna Rosalba Meza-Escalante Luis Alonso Leyva-Soto Maria Angeles Camacho-Ruiz María Olga Concha-Guzmán Ruth Gabriela Ulloa-Mercado Lourdes Mariana Díaz-Tenorio Pablo Gortáres-Moroyoqui Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
description	Response surface methodology was investigated to determine the operational parameters on the degradation of Congo red dye (CR) and chemical oxygen demand (COD) in two electrochemical systems evaluated individually on effluent pretreated by an up-flow anaerobic sludge blanket (UASB) reactor. The UASB reactor was fed with 100 mg L<sup>−1</sup> of CR and was operated for 12 weeks at different hydraulic residence times (HRTs) of 12 h, 10 h, and 8 h. Once stabilized at an HRT of 8 h, the effluent was collected, homogenized, and independently treated by electrooxidation (EO) and electrocoagulation (EC) cells. On both electrochemical systems, two electrode pairs were used; solid for EC (Fe and stainless-steel) and mesh electrodes for EO (Ti/PbO<sub>2</sub> and Ti), and the effect of intensity (A), recirculation flow rate (mL min<sup>−1</sup>), and experimental time (min) was optimized on response variables. The maximum efficiencies of sequential systems for COD degradation and CR decolorization were 92.78% and 98.43% by EC and ≥99.84% and ≥99.71% by EO, respectively. Results indicate that the coupled systems can be used in textile industry wastewater treatment for the removal of dyes and the decolorized by-products.
format	article
author	Itzel Celeste Romero-Soto Celestino García-Gómez Luis Humberto Álvarez-Valencia Edna Rosalba Meza-Escalante Luis Alonso Leyva-Soto Maria Angeles Camacho-Ruiz María Olga Concha-Guzmán Ruth Gabriela Ulloa-Mercado Lourdes Mariana Díaz-Tenorio Pablo Gortáres-Moroyoqui
author_facet	Itzel Celeste Romero-Soto Celestino García-Gómez Luis Humberto Álvarez-Valencia Edna Rosalba Meza-Escalante Luis Alonso Leyva-Soto Maria Angeles Camacho-Ruiz María Olga Concha-Guzmán Ruth Gabriela Ulloa-Mercado Lourdes Mariana Díaz-Tenorio Pablo Gortáres-Moroyoqui
author_sort	Itzel Celeste Romero-Soto
title	Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
title_short	Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
title_full	Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
title_fullStr	Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
title_full_unstemmed	Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems
title_sort	sequential congo red elimination by uasb reactor coupled to electrochemical systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/84a22ce75bce49e2b03a71d5cf6d8224
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Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems

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