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Coupling extraction–flotation with surfactant and electrochemical degradation for the treatment of PAH contaminated hazardous wastes.

Tran, Lan Huong; Drogui, Patrick; Mercier, Guy; Blais, Jean-François (2009). Coupling extraction–flotation with surfactant and electrochemical degradation for the treatment of PAH contaminated hazardous wastes. Journal of Hazardous Materials , vol. 170 , nº 2-3. p. 1218-1226. DOI: 10.1016/j.jhazmat.2009.05.104.

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Résumé

The performance of a two-stage process combining extraction of polycyclic aromatic hydrocarbons (PAHs) with an amphoteric surfactant (CAS) followed by electro-oxidation of PAH-foam concentrate was studied for the decontamination of aluminum industry wastes (AIW) and polluted soils. The PAH suspensions extracted from AIW and soils were treated in a 2 L-parallelepipedic electrolytic cell containing Ti/RuO2 anodes and stainless steel cathodes. Current densities varying from 4.6 to 18.5 mA cm−2 have been tested with and without addition of a supporting electrolyte (6.25 to 50 kg Na2SO4 t−1 of dry waste). The best performance for PAH degradation was obtained while the electrolytic cell was operated during 90 min at a current density of 9.2 mA cm−2, with a total solids concentration of 2.0%, and in presence 12.5 kg Na2SO4 t−1. The application of the process on AIW (initial PAH content: 3424 mg kg−1) allowed extracting 42% of PAH, whereas 50% of PAH was electrochemically degraded in the resulting foam suspensions. By comparison, 44% to 60% of PAH was extracted from polluted soils (initial PAH content: 1758 to 4160 mg kg−1) and 21% to 55% of PAH was oxidized in the foam suspensions. The electrochemical treatment cost (including only electrolyte and energy consumption) recorded in the best experimental conditions varied from 99 to 188 USD $ t−1 of soils or AIW treated.

Type de document: Article
Mots-clés libres: polycyclic aromatic hydrocarbon; electrochemical degradation; electro-oxidation; hydroxyl radical; ruthenium oxide electrode; flotation; amphoteric surfactant
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 janv. 2021 15:28
Dernière modification: 11 janv. 2021 15:28
URI: http://espace.inrs.ca/id/eprint/10748

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