bachelorThesis
Avaliação do comportamento do benzo(a)pireno em subsuperfície e de sua degradação em solo contaminado por oxidação
Fecha
2020-10-05Registro en:
SOUZA, Joyce Azevedo Bezerra de. Avaliação do comportamento do benzo(a)pireno em subsuperfície e de sua degradação em solo contaminado por oxidação. 2020. 82f. Trabalho de Conclusão de Curso (Graduação em Engenharia Química) – Departamento de Engenharia Química, Universidade Federal do Rio Grande do Norte, Natal, 2020.
Autor
Souza, Joyce Azevedo Bezerra de
Resumen
One of the consequences of the contamination of soils and groundwater by oil and its derivatives is the insertion of polycyclic aromatic hydrocarbons (PAHs) in these environments, causing risks to human health and the environment. PAHs can have toxic, carcinogenic and mutagenic properties. Benzo (a) pyrene (BaP) is an HPA classified by USEPA as a priority pollutant and, by IARC, as a pollutant potentially carcinogenic to man. Advanced oxidative processes (AOPs) are widely used to treat areas contaminated by PAHs in order to mineralize the pollutants, transforming them into water and CO2 or into less toxic compounds than the initial ones. The present work aimed to carry out a bibliographical survey about the relevant points of the BaP, seeking to gather information that would guide the elaboration of experimental plans of preliminary oxidation tests for remediation of soil artificially contaminating with BaP. Two complete factorial plans of the type 2³ + 3 central points were carried out. In the first planning, the studied variables were the concentration of sodium persulfate, the concentration of the iron solution II and the pH, and in the second, in addition to the concentration variables, the reaction time was evaluated. The soil samples were extracted and analyzed by a high performance liquid chromatograph coupled to a UV-Vis detector (HPLC-UV). The data obtained as results were treated using the Statistica 7.0 software. Preliminary tests of the oxidation tests indicated that the best experimental condition for the remediation of the concentration of 20 mg kg-1 of BaP would be: solution of [PS] = 20.0 g L-1, solution of [Fe +2] = 27 , 5 g L-1 and reaction time = 3 days, with a pH of 3.0, which showed a percentage of approximately 93.0% removal of the contaminant, which corresponds to a residual concentration of 1.77 mg kg-1 in treated soil, a value that is within the range recommended by CETESB.