Navegando por Palavras-chave "Doehlert Matrix"

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    Aplicação do Percarbonato de Sódio no tratamento de efluente aquoso simulado contendo Amoxicilina utilizando processos oxidativos avançados
    (Universidade Federal de São Paulo (UNIFESP), 2020-10-29) Oliveira, Isaac Henrique Molina de [UNIFESP]; Moraes, José Ermirio Ferreira de [UNIFESP]; Universidade Federal de São Paulo
    The wastewater of the pharmaceutical industry, in many cases, contains residues of several medicines. Antibiotics, for example, are toxic substances that can trigger the growth of resistant microorganisms, leading to a serious public health problem. Advanced Oxidative Processes (AOP) have been widely studied for the treatment of this type of effluent, as they are methods based on the generation of hydroxyl radicals, a highly reactive species, able to destroy several toxic organicsseveral toxic organics. In the present work, the application of sodium percarbonate (SPC) was investigated, as a source of hydrogen peroxide, in the Fenton, photo-Fenton and UV/SPC processessource of hydrogen peroxide, in the Fenton, photo-Fenton and UV/SPC processes was investigated. Amoxicillin, which is one of the most consumed antibiotics in Brazil, was used as a model pollutant, simulating an effluent from the pharmaceutical industry, adopting an initial concentration of 100 mgC L-1. The tests were carried out in a batch system with recirculation, composed of a photochemical reactor coupled to a mixing tank. Experiments were carried out in order to evaluate the influence of the main parameters on the amoxicillin mineralization, such as pH (3 and 10), the type of iron ions source (Fe2+ and Fe3+), the initial concentration of iron ions (0.26; 1.0 and 2.0 mmol L-1) and UV radiation. According to the experimental data obtained, it was possible to observe that the application of SPC showed promising results in the oxidation of amoxicillin, showing mineralization percentages of 65.8% in just 30 minutes and 88.4% in 120 minutes of reaction, by conventional photo-Fenton process (using ions Fe2+). The use of the modified photo-Fenton process (using ions Fe3+) unfolded to be a viable alternative too, reaching a mineralization of 85.7% in 2 hours by the photo-Fenton process. The Doehlert experimental matrix was used to evaluate the modified Fenton and photo-Fenton processes (using ions Fe3+) systematically, evaluating the influence of the molar rate of the SPC solution in terms of the equivalent amount of H2O2 (0.730-2.205 mmolH2O2 min-1) and the initial concentration of ferric ions (0.26-1.56 mmol L-1) in the total organic carbon removal performance. According to the data obtained, for the Fenton process, the most favorable condition was with a high concentration of Fe3+ (1.560 mmol L-1) and a moderate SPC feed rate (1.470 mmolH2O2 min-1). In the case of the photo-Fenton process, for a better removal, low concentrations of Fe3+ (0.585 mmol L-1) and a moderate SPC feed rate (1.470 mmolH2O2 min-1) would be indicated.