Phenanthrene and pyrene oxidation in contaminated soils using Fenton's reagent.
Fenton's reagent has shown its applicability to oxidizing these biorefractory organic contaminants. The purpose of this contribution was to investigate the influence of operating parameters on the process efficiency for soil highly contaminated by PAHs. Five variables were selected: pH, reaction time, UV irradiation, hydrogen peroxide concentration and Fe (II) amendment. Their effects on the oxidation of (i) phenanthrene and on (ii) phenanthrene and pyrene present in freshly contaminated soil samples were studied through batch reactor experiments following factorial designs. For phenanthrene oxidation run with a soil contaminated at 700 mg kg(-1), one set of variables enabled us to reach a residual concentration lower than 40 mg kg(-1) (Dutch legislation threshold). The most important factor was the reaction time, followed at a certain distance by UV irradiation, Fe (II), H(2)O(2) concentration and pH, this last variable being the least significant. The possibility of operating without pH adjustment is of importance in the treatment at the field scale. This shows the feasibility of photo-Fenton-like oxidation for the treatment of soil highly contaminated with PAH and the relative importance of the process variables.
Silva
Paula Tereza de Souza E
PT
Laboratoire des Sciences du Génie Chimique, Nancy-Université, CNRS, 1 rue Grandville, BP 20451, F-54001 Nancy, France.
Silva
Valdinete Lins da
VL
Neto
Benício de Barros
Bde B
Simonnot
Marie-Odile
MO
D002623:Chemistry Techniques, Analytical / Q000379:methods; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D015233:Models, Statistical; D010100:Oxygen / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry; D011721:Pyrenes / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis*; D013997:Time Factors; D014466:Ultraviolet Rays
C045076:Fenton's reagent; D007220:Industrial Waste; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012987:Soil; D012989:Soil Pollutants; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen