Optimization of PAHs Oxidation from a Concentrate of Soil Attrition Using Potassium Permanganate.

Bendouz, Malika; Tran, Lan Huong; Coudert, Lucie; Mercier, Guy et Blais, Jean-François (2017). Optimization of PAHs Oxidation from a Concentrate of Soil Attrition Using Potassium Permanganate. Soil and Sediment Contamination: An International Journal , vol. 26 , nº 6. pp. 605-622. DOI: 10.1080/15320383.2017.1367754.

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Résumé

The treatment of soils contaminated with organic compounds, such as polycyclic aromatic hydrocarbons (PAHs), by attrition produced large amounts of highly concentrated attrition sludge (PAH – attrition concentrate – PAC). This paper studied the performance of an oxidation process using potassium permanganate (KMnO₄) to degrade PAHs that were initially present in attrition concentrates. The influence of operating conditions (temperature, concentration of KMnO₄ and reaction time) was studied, and these parameters were optimized using a response surface methodology (RSM). The results showed that the temperature and the reaction time had a significant and positive effect on the degradation of PAHs for the experimental domain studied (temperature between 20 and 60°C and reaction time between 1 and 7 h). The interaction between the temperature and the concentration of KMnO₄ significantly influenced the degradation of the PAHs. The temperature and the concentration of KMnO4 were the main parameters that influenced the degradation of both phenanthrene (Phe) and benzo [a] pyrene (BaP). For benzo [a] anthracene (BaA), the temperature was the most influential factor. According to our results, the optimal conditions were defined as [KMnO₄] = 0.4 M for 5.5 h at 60°C. These optimal conditions led to degradations of 42.9%, 40.8%, 41.0% and 46.0% of the total PAHs, Phe, BaA and BaP, respectively.

Type de document:	Article
Mots-clés libres:	Box-Behnken; polycyclic aromatic hydrocarbons (PAHs); permanganate oxidation; attrition sludge; degradation
Centre:	Centre Eau Terre Environnement
Date de dépôt:	16 févr. 2018 21:39
Dernière modification:	01 déc. 2018 05:00
URI:	https://espace.inrs.ca/id/eprint/6583

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