Métodos emergentes para aumentar a eficiência do ozônio no tratamento de águas contaminadas

Mahmoud, Anis; Freire, Renato S.

doi:10.1590/s0100-40422007000100032

Cited by 53 publications

(31 citation statements)

References 53 publications

(81 reference statements)

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“…This contradict the work of Assalin et al (2006), and Mahmoud and Freire (2007) who found that the addition of Mn 2+ in concentrations greater than 0.5 mg L -1 as a catalyst for ozonation effluent was more efficient in removing total organic carbon (TOC) compared to conventional ozonation processes. Assalin et al (2006) also compared the TOC degradation efficiency by conventional ozonation process and catalyzed by Mn 2+ at a concentration of 1.0 mg L -1 in an acidic solution (pH 3).…”

Section: Degradation Of Cod In the Synthetic Dairy Wastewater By The mentioning

confidence: 66%

“…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%

“…Água vol. 13 n. 2, e2078 -Taubaté 2018 (E0 = 2.80 V) and tends to be more effective in treating certain recalcitrant compounds (Mahmoud and Freire, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Degradation Of Cod In the Synthetic Dairy Wastewater By The mentioning

confidence: 66%

Section: Variables Unitsmentioning

confidence: 99%

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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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“…Sua redução para oxigênio molecular é espontânea e possui elevado potencial de oxidação: E 0 ≈ 2,1 V, sendo que o radical livre hidroxila, o melhor agente oxidante originado do ozônio molecular, apresenta potencial de 2,7 V [5,6].…”

Section: Aplicação De Ozônio Para Remoção De Manganês Em áGuas De Dreunclassified

Aplicação De Ozônio Para Remoção De Manganês Em Águas De Drenagem Ácida De Mina Na Inb/Caldas

Barolli¹,

Ribeiro²,

Angiolleto³

et al. 2016

TMM

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a ResumoOzônio, alótropo do oxigênio, é encontrado na estratosfera e possui alto poder oxidante. Sua decomposição é espontânea e os radicais livres gerados apresentam potencial de oxidação elevado. Seu uso no tratamento de drenagem ácida de mina é emergente no Brasil e encontra-se em fase piloto nas Indústrias Nucleares do Brasil S.A. em parceria com a empresa Brasil Ozônio, a Fundação Parque de Alta Tecnologia da Região de Iperó e Adjacências e Universidade do Extremo Sul Catarinense, financiado pelo Banco Nacional de Desenvolvimento Econômico e Social. Neste contexto, ozônio como agente oxidante trata eficazmente a drenagem ácida de mina nas águas captadas nos bota-foras, caracterizadas por pH ácido, alta concentração de manganês e ferro, entre outros metais. A aplicação de ozônio foi realizada em reatores acoplados a sistemas hidráulicos de recirculação por meio de bombas centrífugas em unidades projetadas em função da vazão de água de alimentação. O processo de otimização envolveu a variação da vazão de entrada de O 2 , vazão de alimentação de água, concentração de O 3 , recirculação da mistura água/O 3 e tempo de residência. Concentrações remanescentes de ferro, manganês, zinco, lantânio e cério foram monitoradas por ICP-OES após cada tratamento e comparadas com amostras de alimentação. A concentração inicial de manganês contida nas amostras variou de 20 até 89 mg/L. Após o tratamento com O 3 , a concentração final de Mn total encontrada ficou abaixo de 1,0 mg/L, abaixo do limite permitido pela resolução CONAMA 430/2011, que dispõe sobre as condições e padrões de lançamento de efluentes. Palavras-chave: Drenagem ácida de mina; Manganês; Ozônio. OZONE APPLICATION FOR MANGANESE REMOVAL FROM ACID MINE DRAINAGE INB / CALDAS AbstractOzone, allotrope of oxygen is found in the stratosphere and has high oxidizing activity and disinfection action. Its reduction to molecular oxygen is spontaneous and has high potential. The use of ozone in the treatment of acid mine drainage is emerging in Brazil and is found under the pilot phase in the Nuclear Industries of Brazil in partnership with BrasilOzônio company, Foundation Park of High Technology Iperó Region and adjacencies and University of Extremo Sul Catarinense, funded by the National Bank of Economic and Social Development. In this context, ozone as an oxidizing agent treats effectively acid mine drainage from waste rock piles, characterized by acidic pH, high concentration of manganese and iron, among other metals. Ozone application was performed in reactors coupled with recirculation systems by means of centrifugal pumps in a treatment system designed according to the feed water flow. The optimization process involved the variation of the input O 2 flow, feed water flow rate O 3 concentration , recirculation of the mixture water/O 3 and residence

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“…According Mahmoud and Freire (2007), the use of ozone as an oxidation agent has increased in the last decades.…”

Section: Introductionmentioning

confidence: 99%

Activated Sludge and Ozonation Combined System of Sanitary Effluent Treatment to Bacterial and Protozoa Removal - A Case Study

Cordi¹,

Lima²,

França³

et al. 2012

EER

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In order to remediate district effluents, two types of treatments were combined that could be an efficient solution for the great problems involving sanitary effluent, water reuse, organic charge reduction and disinfection processes. Chemical and biological parameters of sanitary effluents before and after activated sludge treatment and subsequent oxidative ozone treatment were monitored. The activated sludge treatment significantly reduced the organic charge, observed by monitoring the chemical oxygen demand (COD) and the total organic carbon (TOC). After the treated effluent from the activated sludge underwent a subsequent treatment with ozone, further decreases in the COD and TOC values were observed. Ozone efficiently eliminated (100%) coliforms and Giardia spp. cysts, which normally are not eliminated by the activated sludge treatment.

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Métodos emergentes para aumentar a eficiência do ozônio no tratamento de águas contaminadas

Cited by 53 publications

References 53 publications

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

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

Aplicação De Ozônio Para Remoção De Manganês Em Águas De Drenagem Ácida De Mina Na Inb/Caldas

Activated Sludge and Ozonation Combined System of Sanitary Effluent Treatment to Bacterial and Protozoa Removal - A Case Study

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