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

  • Tran L
  • Drogui P
  • Mercier G
 et al. 
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Abstract

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/RuO2anodes and stainless steel cathodes. Current densities varying from 4.6 to 18.5 mA cm-2have been tested with and without addition of a supporting electrolyte (6.25 to 50 kg Na2SO4t-1of 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 Na2SO4t-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-1of soils or AIW treated. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Amphoteric surfactant
  • Electro-oxidation
  • Electrochemical degradation
  • Flotation
  • Hydroxyl radical
  • Polycyclic aromatic hydrocarbon
  • Ruthenium oxide electrode

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