Fenton treatment via oxidative mechanism and its kinetics on soil polluted with automatic gas oil

Abstract

The effectiveness, viability and feasibility of applying Fenton reactants in treating soil contaminated with automatic gas oil (AGO) was investigated ex-situ. Soil was simulated to achieve 10% contamination using AGO (diesel) as the primary contaminant. Physicochemical properties and heavy metal contents were characterized using standard analytical methods, while total petroleum hydrocarbon (TPH) content was determined by molecular spectroscopy. An investigation of the soil physicochemical properties shows severe impact of the contaminant on pH, conductivity, phosphorus and (TPH) content. The optimum concentration of Fenton reactants determined from the optimization study was found to be 350,000 ppm H₂O₂ and 600 ppm FeSO₄ at optimum room temperature range of 27-30 °C and optimum pH of 4.7. The highly exothermic Fenton oxidation treatment resulted in significant decrease in TPH content by 87.6% after 6 h of periodic monitoring; breaking down the hydrocarbons into non-toxic environmental friendly products. Kinetics analysis and evaluation shows pseudo -first order mechanism for the Fenton treatment with a calculated rate constant of 0.226 h^-1 and half life of 3 h 4 min. The Fenton method is found to be very effective and efficient not only for the removal of the diesel contaminant, but also for the restoration of lost physicochemical properties occasioned by the effect of the contaminant. The environmental friendliness and fast response time towards effective clean up gives the technique a cutting edge advantage over other conventional methods. It therefore presents potentials for remediation experts in outright applications on real field challenges.

Keywords

Automatic gas oil / Physicochemical / Total petroleum hydrocarbon / Fenton oxidation / Pseudo first order / Optimization study

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