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Optimization and toxicity assessment of a combined electrocoagulation, H2O2/Fe2+/UV and activated carbon adsorption for textile wastewater treatment.
Sci Total Environ. 2019 Feb 15; 651(Pt 1):551-560.ST

Abstract

In this study, the potential application of sequential Electrocoagulation + Fenton (F) or Photo-Fenton (PF) + Active carbon adsorption (EC + F/PF + AC) processes were analyzed as alternatives for the treatment of an industrial textile wastewater resulting from an industrial facility located in Medellín (Colombia). In order to maximize the organic matter degradation, each step of the treatment was optimized using the Response Surface Methodology. At first, the optimal performance of EC was achieved with Fe electrodes operating at pH = 7, jEC = 10 mA/cm2 and 60 rpm, during 10 min of electrolysis. At these conditions, EC let to remove 94% of the dye's color, 56% of the COD and 54% of the TOC. Next, sequentially applied Fenton or photo-Fenton process (i.e., EC + F/PF), operating at the optimized conditions (pH = 4.3, [Fe2+] = 1.1 mM, [H2O2] = 9.7 mM, stirring velocity = 100 rpm and reaction time = 60 min.), improved the quality of the treated effluent. The EC + F let to achieve total color reduction, as well as COD and TOC removals of 72 and 75%, respectively. The EC + PF reached 100% of color, 76% of COD and 78% of TOC reductions. The EC + F/PF processes were more efficient than EC in elimination of low molecular weight (<5 kDa) compounds from wastewater. Moreover, the BOD5/COD ratio increased from 0.21 to 0.42 and from 0.21 to 0.46 using EC + F and EC + PF processes, respectively. However, EC + F/PF were not fully effective for the removal of acute toxicity to Artemia salina: 20% and 60% of reduction in toxicity using EC + F and EC + PF, respectively, comparing to very toxic (100%) raw textile wastewater. Thus, activated carbon adsorption was applied as an additional step to complete the treatment. After AC adsorption, the acute toxicity decreased to 10% and 0% using EC + F and EC + PF, respectively. The total operational costs, including chemical reagents, electrodes, energy consumption and sludge disposal, were of 1.65 USD/m3 and 2.3 USD/m3 for EC + F and EC + PF, respectively.

Authors+Show Affiliations

GIPAB: Grupo de Investigación en Procesos Ambientales, Departamento de Ingeniería de Procesos, Universidad EAFIT, Cr 49 # 7 Sur 50, Medellín, Colombia. Electronic address: egil@eafit.edu.co.Grupo de Investigación en Procesos Reactivos Intensificados con Separación y Materiales Avanzados - PRISMA, Departamento de Física y Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia, Sede Manizales, Campus La Nubia, km 9 vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Caldas, Colombia. Electronic address: idobrosz-gomez@unal.edu.co.Grupo de Investigación en Procesos Reactivos Intensificados con Separación y Materiales Avanzados - PRISMA, Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura, Universidad Nacional de Colombia, Sede Manizales, Campus La Nubia, km 9 vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Caldas, Colombia. Electronic address: magomez@unal.edu.co.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30245411

Citation

GilPavas, Edison, et al. "Optimization and Toxicity Assessment of a Combined Electrocoagulation, H2O2/Fe2+/UV and Activated Carbon Adsorption for Textile Wastewater Treatment." The Science of the Total Environment, vol. 651, no. Pt 1, 2019, pp. 551-560.
GilPavas E, Dobrosz-Gómez I, Gómez-García MÁ. Optimization and toxicity assessment of a combined electrocoagulation, H2O2/Fe2+/UV and activated carbon adsorption for textile wastewater treatment. Sci Total Environ. 2019;651(Pt 1):551-560.
GilPavas, E., Dobrosz-Gómez, I., & Gómez-García, M. Á. (2019). Optimization and toxicity assessment of a combined electrocoagulation, H2O2/Fe2+/UV and activated carbon adsorption for textile wastewater treatment. The Science of the Total Environment, 651(Pt 1), 551-560. https://doi.org/10.1016/j.scitotenv.2018.09.125
GilPavas E, Dobrosz-Gómez I, Gómez-García MÁ. Optimization and Toxicity Assessment of a Combined Electrocoagulation, H2O2/Fe2+/UV and Activated Carbon Adsorption for Textile Wastewater Treatment. Sci Total Environ. 2019 Feb 15;651(Pt 1):551-560. PubMed PMID: 30245411.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Optimization and toxicity assessment of a combined electrocoagulation, H2O2/Fe2+/UV and activated carbon adsorption for textile wastewater treatment. AU - GilPavas,Edison, AU - Dobrosz-Gómez,Izabela, AU - Gómez-García,Miguel-Ángel, Y1 - 2018/09/11/ PY - 2018/07/16/received PY - 2018/09/06/revised PY - 2018/09/09/accepted PY - 2018/9/25/pubmed PY - 2018/12/12/medline PY - 2018/9/25/entrez KW - Activated carbon KW - Electrocoagulation KW - Fenton KW - Industrial textile wastewater KW - Optimization KW - Photo-Fenton KW - Toxicity assessment SP - 551 EP - 560 JF - The Science of the total environment JO - Sci. Total Environ. VL - 651 IS - Pt 1 N2 - In this study, the potential application of sequential Electrocoagulation + Fenton (F) or Photo-Fenton (PF) + Active carbon adsorption (EC + F/PF + AC) processes were analyzed as alternatives for the treatment of an industrial textile wastewater resulting from an industrial facility located in Medellín (Colombia). In order to maximize the organic matter degradation, each step of the treatment was optimized using the Response Surface Methodology. At first, the optimal performance of EC was achieved with Fe electrodes operating at pH = 7, jEC = 10 mA/cm2 and 60 rpm, during 10 min of electrolysis. At these conditions, EC let to remove 94% of the dye's color, 56% of the COD and 54% of the TOC. Next, sequentially applied Fenton or photo-Fenton process (i.e., EC + F/PF), operating at the optimized conditions (pH = 4.3, [Fe2+] = 1.1 mM, [H2O2] = 9.7 mM, stirring velocity = 100 rpm and reaction time = 60 min.), improved the quality of the treated effluent. The EC + F let to achieve total color reduction, as well as COD and TOC removals of 72 and 75%, respectively. The EC + PF reached 100% of color, 76% of COD and 78% of TOC reductions. The EC + F/PF processes were more efficient than EC in elimination of low molecular weight (<5 kDa) compounds from wastewater. Moreover, the BOD5/COD ratio increased from 0.21 to 0.42 and from 0.21 to 0.46 using EC + F and EC + PF processes, respectively. However, EC + F/PF were not fully effective for the removal of acute toxicity to Artemia salina: 20% and 60% of reduction in toxicity using EC + F and EC + PF, respectively, comparing to very toxic (100%) raw textile wastewater. Thus, activated carbon adsorption was applied as an additional step to complete the treatment. After AC adsorption, the acute toxicity decreased to 10% and 0% using EC + F and EC + PF, respectively. The total operational costs, including chemical reagents, electrodes, energy consumption and sludge disposal, were of 1.65 USD/m3 and 2.3 USD/m3 for EC + F and EC + PF, respectively. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/30245411/Optimization_and_toxicity_assessment_of_a_combined_electrocoagulation_H2O2/Fe2+/UV_and_activated_carbon_adsorption_for_textile_wastewater_treatment_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(18)33567-8 DB - PRIME DP - Unbound Medicine ER -