Advanced Oxidation of Polycyclic Aromatic Hydrocarbons in Soils Contaminated with Diesel Oil at Pilot‐Scale

Diesel‐contaminated soil was treated with Fenton's oxidant, from hydrogen peroxide. Soil samples were collected during the earthmoving of RNEST Oil Refinery (Petrobras). A factorial design 33 evidenced that the concentration of iron ions [Fe2+] was the variable with the most statistically signi...

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Bibliographic Details
Published in:Chemical engineering & technology 2021-03, Vol.44 (3), p.503-512
Main Authors: Cavalcanti, Jorge Vinicius Fernandes Lima, Fraga, Tiago José Marques, de Lima, Valmir Félix, Dos Santos e Silva, Daniella Fartes, Loureiro Leite, Mirella De Andrade, do Nascimento, Clístenes Williams Araújo, Schuler, Alexandre Ricardo Pereira, da Motta Sobrinho, Maurício Alves
Format: Article
Language:English
Subjects:
Advanced oxidation processes
Diesel oil contamination
Earthmoving
Factorial design
Hydrogen peroxide
Organic carbon
Oxidation
Oxidizing agents
Pilot‐scale reactors
Polycyclic aromatic hydrocarbons
Refineries
Soil contamination
Soil remediation
Statistical methods
Toxicity
Weight
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Summary:Diesel‐contaminated soil was treated with Fenton's oxidant, from hydrogen peroxide. Soil samples were collected during the earthmoving of RNEST Oil Refinery (Petrobras). A factorial design 33 evidenced that the concentration of iron ions [Fe2+] was the variable with the most statistically significant effect in all experiments. The oxidation efficiency was found to be 57 % of total organic carbon (TOC) and 78 % of polycyclic aromatic hydrocarbon (PAH) removal. Moreover, the sum of low‐molecular‐weight PAHs on treated soil and the sum of high‐molecular‐weight PAHs was determined. Soil remediation in a pilot‐scale reactor led to a reduction of nearly 80 % in total PAHs. Toxicity assessment with Californian red earthworms as bioindicator evidenced the mineralization of PAHs. Soil contaminated with diesel oil was treated by an advanced oxidation process with Fenton oxidant. A removal of 58 % of total organic carbon and 76 % of polycyclic aromatic hydrocarbons (PAHs) in the soil was achieved. The contents of high‐ and low‐molecular‐weight PAHs were within the values established by international standards. Toxicity assessment evidenced the mineralization of most PAHs in soil.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.202000244