Advanced oxidation processes to clean up soil polluted by polycyclic Aromatic Hydrocarbons

Abstract : Remediation of soils contaminated by persistent organic pollutants like Polycyclic Aromatic Hydrocarbons (PAHs) have been widely developed after the discovery of thousands of contaminated sites all over the world. Among the organic pollutants, PAHs are considered as biorefractory compounds, relatively immobile in soils, toxic, carcinogenic and mutagenic. Several techniques have been studied to remove these pollutants from soils, as the Advanced Oxidation Processes (AOPs) that have been proposed in recent years. AOPs are considered as an attractive alternative able to clean up matrices contaminated by refractory substances. In this work, AOPs have been studied to assess their efficacy in the oxidation of PAHs contained in four soil samples from Brazil and France. These AOPs were: (i) treatment by Fenton reactant (H2O2 and Fe(II), (ii) Fenton-like reactant, i.e. Fenton reactant without Fe(II) addition, considering that naturally occurring minerals provided Fe(II), (iii) and (iv) the same treatment with UV radiation, so-called photo-Fenton and photo-Fenton like reactions, and eventually (v) potassium permanganate. In each case, the optimal conditions were determined following factorial designs. Moreover, treatment selectivity was investigated, comparing the oxidation of lower and higher molecular weight PAHs. The formation of oxidation by-procducts was also assessed. To finish, the quality of treated soils was evaluated, by measuring the physico-chemical properties and above all by germination and growth experiments with ray grass chosen as a model plant. The objective was to assess if the treatments allowed further revegetation. In all cases, good oxidation results were reached. Concerning the evaluation of soil quality, it was shown that the treatment by KMnO4, was not compatible with further revegetation. Fenton's reactant had a good effect on soil quality for further revegetation.
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Paula Tereza Souza E Silva. Advanced oxidation processes to clean up soil polluted by polycyclic Aromatic Hydrocarbons. Other. Institut National Polytechnique de Lorraine, 2007. Portuguese. ⟨NNT : 2007INPL014N⟩. ⟨tel-01752811⟩

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