Treatment of hydrocarbon contamination under flow through conditions by using magnetite catalyzed chemical oxidation |
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Authors: | M Usman P Faure C Lorgeoux C Ruby K Hanna |
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Institution: | 1. Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, 38040, Pakistan 2. Laboratoire de Chimie Physique et Microbiologie pour l’Environnement, LCPME, UMR 7564 CNRS–Université de Lorraine, 405 rue de Vandoeuvre, 54600, Villers Les Nancy, France 3. Géologie et Gestion des Ressources Minérales et Energétiques, G2R, UMR 7566, CNRS–Université de Lorraine, 54506, Vandoeuvre Les Nancy, France 4. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6226 “Sciences Chimiques de Rennes”, Avenue du Général Leclerc, 35708, Rennes Cedex 7, France 5. Université Européenne de Bretagne, Rennes, France
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Abstract: | Soil pollution by hydrocarbons (aromatic and aliphatic hydrocarbons) is a major environmental issue. Various treatments have been used to remove them from contaminated soils. In our previous studies, the ability of magnetite has been successfully explored to catalyze chemical oxidation for hydrocarbon remediation in batch slurry system. In the present laboratory study, column experiments were performed to evaluate the efficiency of magnetite catalyzed Fenton-like (FL) and activated persulfate (AP) oxidation for hydrocarbon degradation. Flow-through column experiments are intended to provide a better representation of field conditions. Organic extracts isolated from three different soils (an oil-contaminated soil from petrochemical industrial site and two soils polluted by polycyclic aromatic hydrocarbon (PAH) originating from coking plant sites) were spiked on sand. After solvent evaporation, spiked sand was packed in column and was subjected to oxidation using magnetite as catalyst. Oxidant solution was injected at a flow rate of 0.1 mL min?1 under water-saturated conditions. Organic analyses were performed by GC–mass spectrometry, GC–flame ionization detector, and micro-Fourier transform infrared spectroscopy. Significant abatement of both types of hydrocarbons (60–70 %) was achieved after chemical oxidation (FL and AP) of organic extracts. No significant by-products were formed during oxidation experiment, underscoring the complete degradation of hydrocarbons. No selective degradation was observed for FL with almost similar efficiency towards all hydrocarbons. However, AP showed less reactivity towards higher molecular weight PAHs and aromatic oxygenated compounds. Results of this study demonstrated that magnetite-catalyzed chemical oxidation can effectively degrade both aromatic and aliphatic hydrocarbons (enhanced available contaminants) under flow-through conditions. |
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