Comparação da eficiência do processo de ozonização e ozonização catalítica (Mn II e Cu II) na degradação de fenol

Assalin, Márcia Regina; Silva, Priscila Lima da

doi:10.1590/s0100-40422006000100006

Cited by 18 publications

(11 citation statements)

References 17 publications

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“…Addition of the catalyst (Mn 2+ ) showed no significant effect on the removal of COD from the wastewater. Some authors (ASSALIN et al, 2006;MAHMOUD;FREIRE, 2007) observed improved removal efficiency of the organic load from wastewater when the catalyst Mn 2+ was added to the ozonation process, at concentrations exceeding 1 mg L -1 . Therefore, the non-significance of Mn 2+ addition may be explained by the low concentrations ([Mn 2+ ] < 0.04 mg L -1 ) used in this study.…”

Section: Resultsmentioning

confidence: 99%

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Biosci. J.

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This study evaluated the adjustment of four kinetic models and their respective parameters on data of dairy wastewater treatment by the physico-chemical process of flotation and ozonation. The experiment was implemented during the year 2014, with all the tests in triplicate. The treatments were carried out at different pH levels (3.6, 7.0 and 10.4), and flotation/ozonation was catalyzed by manganese (Mn 2+) in neutral level (pH 7.0). Best removal efficiencies for chemical oxygen demand (COD) were obtained in acidic medium, with removals greater than 75% after 20 min of treatment. There was no significant difference with regards to addition of Mn 2+ on COD removal by the physicochemical process. The kinetic models that best fit to the experimental data, for all treatments, were the asymptotic (residual) model and that of Chan and Chu. Treatment in acidic medium showed the highest values of the kinetic parameters for the adjusted model, obtaining a k coefficient equal to 0.2394 min-1 for the asymptotic model and kinetic coefficient 1/ρ of 0.4816 min-1 for the Chan and Chu model, both presenting a determination coefficient greater than 99%.

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Section: Resultsmentioning

confidence: 99%

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Biosci. J.

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“…O3 ( The variation ranges between the lower limit and the top of each independent variable were assumed based on literature (Assalin et al, 2006;Mahmoud and Freire, 2007) and preliminary tests.…”

Section: Variables Unitsmentioning

confidence: 99%

Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

Carvalho¹,

Borges²,

Pereira³

et al. 2018

Rev. ambiente água

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This work investigated the degradation of organic matter present in synthetic dairy wastewater by the combination of ozonation (ozone (O3)/hydrogen peroxide (H2O2)) and catalytic ozonation (ozone (O3)/manganese (Mn 2+ )) associated with dispersed air flotation process. The effect of independent factors such as O3 concentration, pH and H2O2 and Mn 2+ concentration was evaluated. For the flotation/O3/H2O2 treatment, the significant variables (p ≤ 0.05) were: O3 concentration (linear and quadratic effect), H2O2 concentration linear and quadratic effect, pH values (linear and quadratic effect) and interaction O3 concentration versus pH. For catalytic ozonation, it was observed that the significant variable was the linear effect of O3 concentration. According to the desirability function, it was concluded that the optimal condition for the treatment of flotation/O3/H2O2 can be obtained in acidic solution using O3 concentrations greater than 42.9 mg L -1 combined with higher concentrations of H2O2 to 1071.5 mg L -1 . On other hand, at pH values higher than 9.0, the addition of O3 may be neglected when using higher concentrations than 1071.5 mg L -1 of H2O2. For flotation/ozonation catalyzed by Mn 2+ , it was observed that metal addition did not affect treatment, resulting in an optimum condition: 53.8 mg L -1 of O3 and pH 3.6.Keywords: advanced oxidation processes, catalytic ozonation, physico-chemical treatment. Palavras-chave: ozonização catalítica, processos oxidativos avançados, tratamento físico-químico.

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“…O processo oxidativo via ozônio tem sido amplamente utilizado no tratamento de efluentes domésticos (SILVA, 2008;SOARES, 2007;SALLA, 2006, entre outros) e industriais (KERN, 2012;KRAUSE, 2009;SOUZA, 2009;ASSALIN et al, 2006;SILVA, 2006). Contudo, não há na literatura estudos da utilização de ozônio no pós-tratamento de efluente advindo da atividade automotiva.…”

Section: Introductionunclassified

Tratamento de efluente da atividade automotiva por ozonização convencional e catalítica

Salla¹,

Paula²,

Pinheiro³

2016

RDAE

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ResumoA lavagem de veículos gera efluentes que conferem alto potencial poluidor aos cursos hídricos. As potencialidades dos processos de ozonização convencional e catalítica na presença de carvão ativado foram avaliadas no tratamento desse efluente, com taxa de aplicação superficial de 0,6.10 -3 m 3 /s.m 2 . Em pH ácido, in natura e básico para o efluente, foram avaliados os parâmetros: cor verdadeira, turbidez e DQO. A fim de avaliar o real potencial oxidativo da matéria orgânica pelo processo de ozonização, os estudos de arraste de gases voláteis por meio do borbulhamento de ar comprimido geraram proporções mínimas de arraste. O processo de ozonização convencional apresentou-se eficiente na descoloração do efluente, porém com baixa redução de matéria orgânica. Na ozonização catalítica, as eficiências na redução aumentaram para todos os parâmetros analisados, sugerindo ao carvão ativado elevada capacidade de catalisação na decomposição do ozônio molecular em radical hidroxila e na atuação como adsorvente, não sendo possível, com base nos experimentos realizados, distinguir o mecanismo preponderante. Palavras

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Comparação da eficiência do processo de ozonização e ozonização catalítica (Mn II e Cu II) na degradação de fenol

Cited by 18 publications

References 17 publications

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Degradation kinetics of organic matter in dairy industry wastewater by flotation/ozonation processes

Combined use of O3/H2O2 and O3/Mn2+ in flotation of dairy wastewater

Tratamento de efluente da atividade automotiva por ozonização convencional e catalítica

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