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Résumé :
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Washing of soils polluted with polycyclic aromatic hydrocarbons (PAHs) using surfactant is a widely used technique. Once the pollutant is transferred to the washing solution, the polluted wastewater has to be treated. In this work, the feasibility of conductive-diamond electrochemical oxidation (CDEO) to treat wastewater polluted with phenanthrene (selected as model PAHs) and three different surfactants (anionic, cationic, and nonionic), which were tested as the washing solution, has been studied. The results show that CDEO enables a significant reduction in the organic load of the wastes regardless of the surfactant present. However, the process efficiency is largely influenced by the type of surfactant employed. Thus, aliphatic linear-chain species seem to lead to the formation of oxidation-refractory compounds, whereas molecules with an aromatic structure favor the formation of insoluble species. The observed changes in pH and conductivity seem to confirm this assumption. In contrast, dimensionally stable anode technology is ineffective in the treatment of these effluents.
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