Treatability studies of naphthalene in soil, water and air with persulfate activated by iron(II)

Publication date: Available online 9 December 2019Source: Journal of Environmental SciencesAuthor(s): Gabriela P. Mendes, Vivian M.A. Magalhães, Lélia C.R. Soares, Rayanne M. Aranha, Claudio A.O. Nascimento, Marilda M.G.R. Vianna, Osvaldo Chiavone-FilhoAbstractChemical oxidation was applied to an artificially contaminated soil with naphthalene (NAP). Evaluation of NAP distribution and mass reduction in soil, water and air phases was carried out through mass balance. Evaluation of NAP distribution and mass reduction in soil, water and air phases was carried out through mass balance. The importance of the air phase analysis was emphasized by demonstrating how NAP behaves in a sealed system over a 4 hr reaction period. Design of Experiments method was applied to the following variables: sodium persulfate concentration [SP], ferrous sulfate concentration [FeSO4], and pH. The system operated with a prefixed solid to liquid ratio of 1:2. The following conditions resulted in optimum NAP removal [SP] = 18.37 g/L [FeSO4] = 4.25 g/L and pH = 3.00. At the end of the 4 hr reaction, 62% of NAP was degraded. In the soil phase, the chemical oxidation reduced the NAP concentration thus achieving levels which comply with Brazilian and USA environmental legislations. Besides the NAP partitioning view, the monitoring of each phase allowed the variabilities assessment over the process, refining the knowledge of mass reduction. Based on NAP distribution in the system, this study demon...
Source: Journal of Environmental Sciences - Category: Environmental Health Source Type: research