Oxidação catalítica de contaminante aquático com catalisadores a base de lodo de tratamento de água

• Ano de defesa: 2023
• Autor(a) principal: Figueiredo, Elaine Basilio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Londrina; Brasil; Programa de Pós-Graduação em Engenharia Ambiental; UTFPR
• Palavras-chave em Português: Catalisadores; Água - Purificação; Lodo residual; Oxidação; Catalysts; Water - Purification; Sewage sludge; Oxidation; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA; Engenharia/Tecnologia/Gestão
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/31044

A type of waste (sludge) is generated in the water treatment process, whose proper final destination has become a challenge for sanitation companies due to its composition and volume generated. Given this obstacle, the aim of this study was to synthesize a catalytic material from water treatment plant sludge and apply in catalytic oxidation with hydrogen peroxide (CWPO), using methylene blue dye as a model pollutant. The synthesis of the catalysts occurred through a thermal and chemical process applied to the sludge. In the thermal process, the sludge was carbonized in a muffle furnace at 600°C, 700°C, and 800°C. Subsequently, the pyrolyzed samples were chemically modified with phosphoric acid. The catalytic materials obtained were characterized according to their chemical composition, physical and textural characteristics. Finally, catalytic oxidation tests were used to correlate the efficiency of removing the methylene blue pollutant with the different treatments applied to the sludge. Changes in surface area measurements and morphology were observed in the different coals as the carbonization temperature increased. In addition, an increase in the concentration of iron present in the catalysts was observed after carbonization. The highest efficiency in the removal of methylene blue by catalytic oxidation was 97,31% obtained by the chemically modified pyrolyzed coal at 800°C, which presented the best efficiency among the studied coals. The results were satisfactory for the experimental conditions adopted, showing the potential of sludge as a precursor for catalytic materials.