Treatment of industrial oily wastewaters by wet oxidation

C. Zerva, Z. Peschos, S. G. Poulopoulos, C. J. Philippopoulos

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


In the present work, the homogeneous wet oxidation (WO) of an oily wastewater (COD≈11,000mgl-1), composed mainly of alcohols and phenolic compounds, was studied in a high-pressure agitated autoclave reactor in the temperature range of 180-260°C and oxygen pressure 1MPa. Temperature was found to have a significant impact on the oxidation of the contaminants in the wastewater. Among the compounds contained in the wastewater, ethylene glycol showed great resistance to wet oxidation. Temperatures above 240°C were required for its effective degradation. Organic acids, mainly acetic acid, were the intermediate products of the wet oxidation process and their conversion to carbon dioxide was very slow. A generalised model based on a parallel reaction scheme was used to interpret the experimental data obtained. The activation energies obtained were in the range of 90-130kJmol-1.

Original languageEnglish
Pages (from-to)257-265
Number of pages9
JournalJournal of Hazardous Materials
Issue number1-3
Publication statusPublished - Feb 28 2003


  • COD removal
  • Ethylene glycol
  • Oily wastewaters
  • Organic acids
  • Wet oxidation

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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