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https://doi.org/10.18502/espoch.v3i1.14408

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authors

  • P. E Ochoa

    P. E Ochoa

    Carrera de Ingeniería Química, Facultad de Ingeniería Química, Universidad Central del Ecuador. 170521
  • S L Gavilánes

    S L Gavilánes

    Carrera de Ingeniería Química, Facultad de Ingeniería Química, Universidad Central del Ecuador. 170521
  • J S Achote

    J S Achote

    Carrera de Ingeniería Química, Facultad de Ingeniería Química, Universidad Central del Ecuador. 170521
  • M A Alban

    M A Alban

    Carrera de Ingeniería Química, Facultad de Ingeniería Química, Universidad Central del Ecuador. 170521

Published Date

  • Nov 9, 2023

Recovery of Total Chromium from Tannery Wastewater by Carbonization Application

ESPOCH Congresses: The Ecuadorian Journal of S.T.E.A.M. / Volume 3 Issue 1 / Pages 3–15

Abstract

A carbonization process was carried out for the recovery of chromium from wastewater by chemical treatment with sodium hydroxide as a basic solution in contact with the precursor material at different concentrations [1:0.15 (%w/w) - 1:0.20 (%w/w)]. The physical treatment was carried out with carbonization at 700∘C for a period of 2 hours. The obtained samples were characterized by elemental analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), atomic absorption spectroscopy, and surface area analysis (BET) to validate the evidence of metal recovery. The results indicate that the percentage of total chromium recovery was 47.62% with respect to the uncarbonized material, establishing that the best carbonization variables are at 700∘C and concentration 1:0.20% w/w for 2 hours.


Keywords: tannery industry, carbonization, recovery, total chromium.


Resumen


Se realizó un proceso de carbonización para la recuperación de cromo a partir de aguas residuales mediante un tratamiento químico con hidróxido de sodio como solución básica en contacto con el material precursor a diferentes concentraciones [1:0,15 (%p/p)- 1:0,20 (%p/p)], el tratamiento físico se realizó con la carbonización a 700∘C por un lapso de 2 horas. Las muestras obtenidas se caracterizaron mediante análisis elemental, análisis termogravimétrico (TGA), espectroscopia infrarroja por transformada de Fourier (FT-IR), espectroscopia de absorción atómica y análisis de área superficial (BET) para validar la evidencia de la recuperación del metal. Los resultados indican que el porcentaje de recuperación de cromo total es de 47,62% respecto del material sin carbonizar estableciendo que las mejores variables de carbonización son 700 ∘C y concentración 1:0.20 %p/p por 2 horas.


Palabras Clave: Industria curtiembre, carbonización, recuperación, cromo total.

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