Removal of sorbed polycyclic aromatic hydrocarbons from soil, sludge and sediment samples using the Fenton's reagent process.
The use of the Fenton's reagent process has been investigated for the remediation of environmental matrices contaminated by polycyclic aromatic hydrocarbons (PAHs). Laboratory experiments were first conducted in aqueous solutions, to study the kinetics of oxidation and adsorption of PAHs. Benzo[a]pyrene was more rapidly degraded than adsorbed, while only partial oxidation of fluoranthene occurred. In the case of benzo[b]fluoranthene, its adsorption prevented its oxidation. Besides competition effects between PAHs were found, with slower oxidation of mixtures as compared to single PAH solutions. Apparition of some by-products was observed, and a di-hydroxylated derivative of benzo[a]pyrene could be identified under our conditions. Consequently, application to solid environmental matrices (soil, sludge and sediment samples) was performed using large amounts of reagents. The efficiency of the Fenton treatment was dependent on the matrix characteristics (such as its organic carbon content) and the PAH availability (correlated to the date and level of contamination). However, no pH adjustment was required, as well as no iron addition due to the presence of iron oxides in the solid matrices, suggesting the potential application of Fenton-like treatment for the remediation of PAH-contaminated environmental solids.
Flotron
Vanina
V
Institut National Agronomique Paris-Grignon, Laboratoire de Chimie Analytique-UMR Environnement et Grandes Cultures, 16 Rue Claude Bernard, 75231 Paris cedex 05, France.
Delteil
Corine
C
Padellec
Yann
Y
Camel
Valérie
V
D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D004785:Environmental Pollutants / Q000032:analysis; D019015:Geologic Sediments / Q000032:analysis*; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007501:Iron; D007700:Kinetics; D010084:Oxidation-Reduction; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry* / Q000302:isolation & purification; D012722:Sewage / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
D004785:Environmental Pollutants; C045076:Fenton's reagent; D007202:Indicators and Reagents; D011084:Polycyclic Aromatic Hydrocarbons; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D006861:Hydrogen Peroxide; D007501:Iron