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Solar degradation of 5-amino-6-methyl-2-benzimidazolone by TiO2 and iron(III) catalyst with H2O2 and O2 as electron acceptors

Author

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  • Sarria, Victor
  • Péringer, Paul
  • Cáceres, Julia
  • Blanco, Julian
  • Malato, Sixto
  • Pulgarin, Cesar

Abstract

Wastewater containing mainly 5-amino-6-methyl-2-benzimidazolone (AMBI), used in the manufacture of dyes, was characterized as bio-recalcitrant by means of different biodegradability tests. In order to enhance the biodegradability of this important pollutant, solar photocatalytic degradation methods were explored. The systems light/TiO2/O2, light/TiO2/H2O2, light/Fe3+/O2 and light/Fe3+/H2O2 were compared under direct sunlight at the Plataforma Solar de Almeria (Spain), using a Compound Parabolic Collector (CPC). The iron photo-assisted systems exhibited the most interesting behaviour, from the kinetic and engineering points of view, especially if their combination (as pre-treatment) with a biological process is considered. To compare the efficiency of these systems, the evolution of the following parameters were studied: (a) the dissolved organic carbon and initial compound concentration, (b) the toxicity, and (c) the biodegradability of treated solution. At lab scale, using a solar lamp, the degradation rate of the system light/Fe3+/H2O2 was two times higher than the system light/Fe3+/O2 but this last system does not need H2O2 addition, improving the economical requirements of the system.

Suggested Citation

  • Sarria, Victor & Péringer, Paul & Cáceres, Julia & Blanco, Julian & Malato, Sixto & Pulgarin, Cesar, 2004. "Solar degradation of 5-amino-6-methyl-2-benzimidazolone by TiO2 and iron(III) catalyst with H2O2 and O2 as electron acceptors," Energy, Elsevier, vol. 29(5), pages 853-860.
    • Handle: RePEc:eee:energy:v:29:y:2004:i:5:p:853-860
    DOI: 10.1016/S0360-5442(03)00190-7
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