A combined electrocoagulation – sorption process applied to mixed industrial wastewater

  • Linares-Hernández I
  • Barrera-Díaz C
  • Roa-Morales G
 et al. 
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Abstract

The removal of organic pollutants from a highly complex industrial wastewater by a aluminium electrocoagulation process coupled with biosorption was evaluated. Under optimal conditions of pH 8 and 45.45Am−2 current density, the electrochemical method yields a very effective reduction of all organic pollutants, this reduction was enhanced when the biosorption treatment was applied as a polishing step. Treatment reduced chemical oxygen demand (COD) by 84%, biochemical oxygen demand (BOD5) by 78%, color by 97%, turbidity by 98% and fecal coliforms by 99%. The chemical species formed in aqueous solution were determined. The initial and final pollutant levels in the wastewater were monitored using UV–vis spectrometry and cyclic voltammetry. Finally, the morphology and elemental composition of the biosorbent was characterized with scanning electron microscopy (SEM) and energy dispersion spectra (EDS). ©

Author-supplied keywords

  • biosorption
  • electrochemical process
  • industrial wastewater treatment
  • superfaradaic efficiencies

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Authors

  • Ivonne Linares-Hernández

  • Carlos Barrera-Díaz

  • Gabriela Roa-Morales

  • Bryan Bilyeu

  • Fernando Ureña-Núnez

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