OPTIMIZATION OF THE APPLICATION OF THE FENTON CHEMISTRY FOR THE REMEDIATION OF A CONTAMINATED SOIL WITH POLYCYCLIC AROMATIC HYDROCARBONS

FERNANDO PARDO PARDO; MARINA PELUFFO; AURORA SANTOS; ARTURO ROMERO

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY B

John Wiley & Sons Ltd

Año: 2015 vol. 91 p. 1763 - 1772

0264-3421

ABSTRACT BACKGROUND: A contaminated soil with 100 mg.kg-1 each of the following pollutants: anthracene (ANT), phenanthrene (PHE), pyrene (PYR) and benzo(a)pyrene (BaP) was treated by three different kinds of Fenton?s reactions without pH adjustment, Fenton like reaction (hydrogen peroxide (H2O2) with a ferric iron salt (Fe(III)), Fenton catalyzed with nanoparticles of zerovalent iron (nZVI) and Fenton like reaction coupled simultaneously with soil washing, using sodium dodecyl sulfate (SDS) as surfactant. Influence of initial iron concentration (1-5 mmol.L-1), oxidant dosage (88-1765 mmol.L-1), type of iron initially added (Fe(III) or nZVI) and effect of surfactant addition were tested. RESULTS: Almost total conversion of ANT and BaP was achieved for the majority of the experiments, having obtained the best results for the Fenton like reaction with initial Fe(III) concentration of 5 mmol.L-1, where a total abatement for all contaminants was obtained in less than 10 days. Besides, the coupling of Fenton reagent and soil washing enhanced the removal of the PAHs studied. 9-10 anthraquinone (ATQ) was detected as the main aromatic intermediate. CONCLUSIONS: The results put forward in this work reveal the suitability of new effective alternatives to conventional Fenton Reagent for the removal of PAH in soils.