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9777
Chelate Enhanced Modified Fenton Treatment for Polycyclic Aromatic Hydrocarbons Contaminated Soils
Abstract:
This work focuses on the remediation of polycyclic aromatic hydrocarbons (PAHs)-contaminated soil via Fenton treatment coupled with novel chelating agent (CA). The feasibility of chelated modified Fenton (MF) treatment to promote PAH oxidation in artificially contaminated soils was investigated in laboratory scale batch experiments at natural pH. The effects of adding inorganic and organic CA are discussed. Experiments using different iron catalyst to CA ratios were conducted, resulting in hydrogen peroxide: soil: iron: CA weight ratios that varied from 0.049: 1: 0.072: 0.008 to 0.049: 1: 0.072: 0.067. The results revealed that (1) inorganic CA could provide much higher PAH removal efficiency and (2) most of the proposed CAs were more efficient than commonly utilised CAs even at mild ratio. This work highlights the potential of novel chelating agents in maintaining a suitable environment throughout the Fenton treatment, particularly in soils with high buffer capacity.
Digital Object Identifier (DOI):

References:

[1] S. Lewis, A. Lynch, L. Bachas, S. Hampson, L. Ormsbee, and D. Bhattacharyya, "Chelate-modified Fenton reaction for the degradation of trichloroethylene in aqueous and two-phase systems," Environ. Eng. Sci, vol. 26, pp. 849-859, 2009.
[2] K. Nam, W. Rodriguez, and J. J. Kukor, "Enhanced degradation of polycyclic aromatic hydrocarbons by biodegradation combined with a modified Fenton reaction," Chemosphere, vol. 45, pp. 11-20, 2001.
[3] Patiram, Brajendra, T.N.S. Azad, and T. Ramesh, Soil Testing and Analysis: Plant, Water and Pesticide Residues. India: New India Publishing Agency, 2007, pp. 27-45.
[4] C.-y. Chen and S.-c. Wu, "The effects of pretreatment on the surface properties of soils," Chemosphere, vol. 32, pp. 1083-1090, 1996.
[5] P. J. A. Howard, and D.M. Howard, "Use of organic carbon and loss-onignition to estimate soil organic matter in different soil types and horizons," Biol. Fertil. Soils, vol. 9, pp. 306-310, 1990.
[6] B. W. Bogan, and V. Trbovic, "Effect of sequestration on PAH degradability with Fenton's reagent: roles of total organic carbon, humin, and soil porosity," J. Hazard. Mater, vol. 100, pp. 285-300, 2003.
[7] X. Xue, K. Hanna, C. Despas, F. Wu, and N. Deng, "Effect of chelating agent on the oxidation rate of PCP in the magnetite/H2O2 system at neutral pH," J. Mol. Catal. A: Chem, vol. 311, pp. 29-35, 2009.
[8] S. R. Kanel, B. Neppolian, H. Choi, and J.W. Yang, "Heterogeneous catalytic oxidation of phenanthrene by hydrogen peroxide in soil slurry: kinetics, mechanism and implication," Soil Sediment Contam, vol. 12, pp. 101-117, 2003.
[9] C. Valderrama, R. Alessandri, T. Aunola, J. L. Cortina, X. Gamisans, and T. Tuhkanen, "Oxidation by Fenton's reagent combined with biological treatment applied to a creosote-contaminated soil," J. Hazard. Mater, vol. 166, pp. 594-602, 2009.
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