Enhancement of biodegradability of o-toluidine effluents by electro-assisted photo-Fenton treatment

Sergi Garcia-Segura, Jin Anotai, Somporn Singhadech, Ming Chun Lu

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The treatment of highly recalcitrant and non-biodegradable solutions of 1 mM of o-toluidine has been comparatively treated by different water treatment technologies based on Fenton's reaction: conventional Fenton process, electro-assisted Fenton process and electro-assisted photo-Fenton process. The pollutant was mainly oxidized by the homogeneous [rad]OH released in situ by the Fenton's reaction. The electro-assisted photo-Fenton technology demonstrated better performance due to the faster electro-regeneration of iron(II) and the coupled photolysis of several by-products such carboxylic acids attaining complete o-toluidine removal in 60 min of treatment. The study of the biodegradability enhancement after the treatment achievieng values near to 0.4 of BOD5/COD ratio assessed the feasible application of electro-assisted photo-Fenton process as pre-biological treatment. In addition, a reaction pathway for o-toluidine mineralization by electro-assisted photo-Fenton's reaction is proposed.

Original languageEnglish (US)
Pages (from-to)60-67
Number of pages8
JournalProcess Safety and Environmental Protection
Volume106
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Anodic oxidation
  • Electrochemical advanced oxidation processes
  • Persistent organic pollutants
  • Photo-Fenton
  • RuO/IrODimensional Stable Anodes (DSA)
  • Water treatment technologies
  • o-toluidine reaction pathway

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Safety, Risk, Reliability and Quality

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