INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Use of different kinds of persulfate activation with iron for the remediation of a PAH-contaminated soil
Autor/es:
MARINA PELUFFO; ARTURO ROMERO; AURORA SANTOS; FERNANDO PARDO PARDO
Revista:
SCIENCE OF THE TOTAL ENVIRONMENT
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2016 vol. 563 p. 649 - 656
ISSN:
0048-9697
Resumen:
Due to the potential risks related to the exposure pathways, from the source of contamination to receptors (human health, life forms, water resources, etc.), contamination of soils by persistent pollutants is considered a matter of increasing concern,. In this work, activated persulfate (PS) was applied for the remediation of a polycyclic aromatic hydrocarbons (PAHs) contaminated soil with anthracene (ANT), phenanthrene (PHE), pyrene (PYR) and benzo[a]pyrene (BaP) through the activation by different ways, involving ferric, ferrous sulfate salts (1 - 5 mmol?L-1) and nanoparticles of zerovalent iron (nZVI). With the purpose of improve the oxidation rate in the aqueous phase, addition of a surfactant, sodium dodecyl sulfate (SDS) was tested. Besides, effect of a reductant, as humic acid (HA) on PAHs conversion was also studied. A conversion near 100% was achieved for ANT and BaP in all the runs carried out. Nevertheless, remarkable differences on removal efficiencies were observed for the different techniques applied in case of PHE and PYR. In this sense, the highest conversions of PHE (80%) and PYR (near 100%) were achieved when nZVI was used as activator. On the other hand, similar results were obtained when activation was carried out either with Fe2+ or Fe3+.This can be explained by the presence of quinone type compounds, like anthraquinone (ATQ), that can promote the reduction of Fe3+ into Fe2+, and react for longer with PS to generate sulfate radicals. Addition of HA did not produce an improvement of the process while surfactant addition slightly increases the PAHs removal. Furthermore, a kinetic model was developed, describing the behavior of persulfate consumption, and contaminants removal under first order kinetics.