Recovery of Total Chromium from Tannery Wastewater by Carbonization Application

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

Recovery of Total Chromium from Tannery Wastewater by Carbonization Application

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