Fenton. Nos dois casos, foi utilizada a técnica de planejamento fatorial de experimentos, tendo como variáveis independentes o pH, a concentração de Fe (II) e, no caso do Fenton, a concentração de peróxido de hidrogênio. A otimização do processo foi definida pela variável remoção de DQO e cor verdadeira, utilizando a metodologia de superfícies de contorno aliada à técnica de planejamento experimental. Utilizado como pós-tratamento, o processo Fenton permitiu remoção de 71% da DQO e 92% da cor verdadeira. Já o processo físico-químico levou à redução de 78% de DQO e 96% da cor verdadeira.Palavras-chave: Lixiviado de aterro sanitário. Tratamento físico-químico. Fenton. Abstract: After air stripping and biological treatment with activated sludge with nitrification-denitrification, the sanitary landfill leachate was pos-treated by conventional coagulation-floculation-sedimentation and Fenton processes. In both cases it was used the technique of experimental design for optimization of the variables pH, concentration of Fe (II) and hydrogen peroxide as independent variables. The process optimization was defined by
ResumoNeste trabalho foi investigada a cinética de degradação do efluente bruto de curtume, coletado no tanque de homogeneização com demanda química de oxigênio equivalente a 3340 mg L -1 e pH de 8,1, por processos de oxidação avançados como fotocatálise mediada por semicondutor, fotólise em presença de peróxido de hidrogênio e processo foto-Fenton a 30 o C. Os experimentos foram realizados usando-se o efluente diluído na proporção de 1:50 em água destilada no interior de um reator cilíndrico de parede dupla aberto à atmosfera, variando-se a concentração dos oxidantes. As constantes de velocidade de degradação, k obs , do efluente, calculadas sob condições de pseudo-primeira ordem, foram maiores para o processo fotocatalítico em meio de ZnO (k obs = 1,23x10-1 a 2,74x10 In this work it was investigated the degradation kinetics of the crude tannery wastewater, collected in the homogenized reservoir with a chemical oxygen demand of 3340 mg L -1 at pH 8.1, through the advanced oxidation processes as photocatalysis mediated by semiconductor, photolysis in presence of hydrogen peroxide and photo-Fenton process at 30 o C. The experiments were performed using a 1:50 proportion in distilled water inside the double wall cylindrical reactor opened to the atmospheric air by varying the oxidant concentration. The degradation rate constants, k obs , determined under pseudofirst order conditions in pH ca. 7.3 and 30 ºC, were higher for the photocatalytic process mediated by ZnO (k obs = 1.23x10 -1 to 2.74x10 -1 min -1 ) followed by TiO 2 (0.90x10 -2 min -1 to 3.35x10 -2 min -1 ). As to for the rate constants under photolysis in presence of H 2 O 2 (9.36x10 -3 to 7.44x10 -3 min -1 ) at pH ca. 6.8 as well as in photo-Fenton (7.30x10 -3 to 12.0x10 -3 min -1 ) at pH 5.8 was significantly lower than photocatalysis at 30°C. The chemical oxygen demand of the wastewater was completely removed after 2 h on photocatalytic process at 30 °C.
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