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Statistical optimization of industrial textile wastewater treatment by electrochemical methods

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Abstract

In this work, the Box–Behnken experimental design and the surface response methodology were applied for the optimization of the operational conditions of the electro-catalytic degradation of wastewaters, resulting from a local textile industry. The experiments were carried out in a laboratory scale batch cell reactor, with monopolar configuration, and electrodes made of boron-doped diamond (anode) and titanium (cathode). The multifactorial experimental design included the following variables: current density (i: 5–10 mA/cm2), pH (3–7), and submerged cathode area (CA: 8–24 cm2). To determine the process efficiency, the degradation percentage of: the chemical oxygen demand (%DCOD), the total organic carbon (%DTOC) and the color (%DC) were defined as response variables. The following optimal conditions for the electro-oxidation (EO) process were obtained: i = 10 mA/cm2, pH = 3 and CA = 16 cm2, reaching ca. 92 % of DC, 37 % of DCOD and 31 % of DTOC. The electro-Fenton (EF) and photo-electro-Fenton (PEF) processes were also evaluated at EO optimal conditions. For the EF process, with addition of iron (0.3 mM), the %DC, %DCOD and %DTOC was enhanced to 95, 52 and 45 %, respectively. For the PEF process (UV = 365 nm), it was possible to reach 98 %DC, 56 %DCOD and 48 %DTOC.

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Acknowledgments

The authors thank to the Dirección de Investigación de la Universidad EAFIT, Medellin-Colombia and COLCIENCIAS, Young Researchers Program, for financial support of this research.

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Authors and Affiliations

  1. GIPAB: Grupo de Investigación en Procesos Ambientales, Departamento de Ingeniería de Procesos, Universidad EAFIT, Carrera 49 #7 sur 50, Medellín, Colombia

    Edison GilPavas & José Medina

  2. 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

    Izabela Dobrosz-Gómez

  3. 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

    Miguel Angel Gómez-García

Authors
  1. Edison GilPavas
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  2. José Medina
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  3. Izabela Dobrosz-Gómez
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  4. Miguel Angel Gómez-García
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Correspondence to Edison GilPavas.

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GilPavas, E., Medina, J., Dobrosz-Gómez, I. et al. Statistical optimization of industrial textile wastewater treatment by electrochemical methods. J Appl Electrochem 44, 1421–1430 (2014). https://doi.org/10.1007/s10800-014-0767-y

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  • DOI: https://doi.org/10.1007/s10800-014-0767-y

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