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Article

Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems

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Departamento de Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, 5 de Febrero 818 sur, Ciudad Obregón 85000, Mexico
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Centro Universitario del Norte, Universidad de Guadalajara, Km. 191, Mexico 45D No. 23, Colotlán 46200, Mexico
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Facultad de Agronomía, Universidad Autónoma de Nuevo León, Francisco I. Madero S/N, Ex Hacienda el Cañada, Ciudad General Escobedo 66050, Mexico
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Departamento de Ciencias Agronómica y Veterinarias, Instituto Tecnológico de Sonora, 5 de Febrero 818 sur, Ciudad Obregón 85000, Mexico
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Departamento de Ciencias del Agua y Medio Ambiente, Instituto Tecnológico de Sonora, 5 de Febrero 818 sur, Ciudad Obregón 85000, Mexico
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Authors to whom correspondence should be addressed.
Academic Editor: Chin-Pao Huang
Water 2021, 13(21), 3087; https://doi.org/10.3390/w13213087
Received: 23 September 2021 / Revised: 23 October 2021 / Accepted: 30 October 2021 / Published: 3 November 2021
(This article belongs to the Special Issue Advanced Electrochemical Technologies for Water Treatment)
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−1 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/PbO2 and Ti), and the effect of intensity (A), recirculation flow rate (mL min−1), 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. View Full-Text
Keywords: azo dye; electrooxidation; electrocoagulation; Congo red; UASB; wastewater azo dye; electrooxidation; electrocoagulation; Congo red; UASB; wastewater
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MDPI and ACS Style

Romero-Soto, I.C.; García-Gómez, C.; Álvarez-Valencia, L.H.; Meza-Escalante, E.R.; Leyva-Soto, L.A.; Camacho-Ruiz, M.A.; Concha-Guzmán, M.O.; Ulloa-Mercado, R.G.; Díaz-Tenorio, L.M.; Gortáres-Moroyoqui, P. Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems. Water 2021, 13, 3087. https://doi.org/10.3390/w13213087

AMA Style

Romero-Soto IC, García-Gómez C, Álvarez-Valencia LH, Meza-Escalante ER, Leyva-Soto LA, Camacho-Ruiz MA, Concha-Guzmán MO, Ulloa-Mercado RG, Díaz-Tenorio LM, Gortáres-Moroyoqui P. Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems. Water. 2021; 13(21):3087. https://doi.org/10.3390/w13213087

Chicago/Turabian Style

Romero-Soto, Itzel Celeste, 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, and Pablo Gortáres-Moroyoqui. 2021. "Sequential Congo Red Elimination by UASB Reactor Coupled to Electrochemical Systems" Water 13, no. 21: 3087. https://doi.org/10.3390/w13213087

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