Ferro-processos aplicados à degradação de efluente da produção de trifluralina
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/27049 |
Resumo: | In this work, comparative studies about the performance of iron-processes were carried out in the pre-treatment of effluent streams samples (under high concentration) from the trifluralin herbicide production (amination water). It was investigated the use of iron in the Fe²+/H2O2 system (Fenton process); in photoprocess Fe²+/H2O2/UV (photo-Fenton system), preceded of non-Fe²+ addition (photoperoxidation system); Fe° (Fe°-reduction) and electrochemistry process (electrocoagulation system). It was used factorial design to optimize experimental conditions and the effects of variables were evaluated. The investigated variables were concentration of reagents and pH, in the Fenton, photoperoxidation, photoFenton e Fe°-reduction process (amination water, 50% v/v); electrode type and electrodes’s distance from each other, cell voltage and pH, in the electrocoagulation process (amination water, 25% v/v). It was adjusted an analytical procedure for the determination of the chemical oxygen demand, COD, for the samples containing a high saline level, propitiating the correction of the interference from chloride ion in a concentration range of approximately 15% (amination water). In standard samples, the results presented a relative standard deviation (RSD) of 10% and relative error of –3%. When using amination water samples the results presented a RSD of 7%. The applied process were evaluated through UV-vis spectra, COD, H2O2 consumption (Fenton, photoperoxidation, photo-Fenton process) and acute toxicity. All processes were positively affected by the increasing of concentration of reagents and decreasing of pH. The electrocoagulation process achieved better efficiency when shorter electrodes’s distances were used, higher voltages and extreme conditions of pH (alkaline conditions were better), independently of the electrode type tested. The experiments were carried out in semi-bach tank stirred reactor. This way, after 2 hours of treatment under optimized conditions (Fenton: 1000 mL; pH 5; 1500 mg H2O2 L-¹; 500 mg Fe²+ L-¹; photoperoxidation- T: 50°C; 500 mL; lamp power: 125 W; pH 5; 1600 mg H2O2 L-¹; photo-Fenton- 500 mL; lamp power: 125 W; 2500 mg L-¹ de H2O2; 300 mg L-¹ de Fe²+; Fe°-reduction- 1000 mL; 10000 mg Fe°; pH 5; electrocoagulation- 200 mL; voltage cell: 5 V; pH 9; stainless steel electrodes distance: 2 cm) the best results were, in relation to color reduction (λmax = 420 nm), electrocoagulation (96%), Fe°-reduction (96%), photo-Fenton (89%), Fenton (60%) e photoperoxidation (13%). In addition, the COD reduction showed better results when using electrocoagulation (60%), photo-Fenton (20%), Fe°-reduction (15%) e photoperoxidation (6%). Considering acute toxicity reduction, the best results were achieved through the electrocoagulation process. In all processes, the reactions’s kinetic was the limiting factor to achieve better efficiency. |
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Ferro-processos aplicados à degradação de efluente da produção de trifluralinaIron-process applied to degradation of effluent from trifluralin productionQuímicaQuímica analíticaHerbicidasTrifluralinaCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICAIn this work, comparative studies about the performance of iron-processes were carried out in the pre-treatment of effluent streams samples (under high concentration) from the trifluralin herbicide production (amination water). It was investigated the use of iron in the Fe²+/H2O2 system (Fenton process); in photoprocess Fe²+/H2O2/UV (photo-Fenton system), preceded of non-Fe²+ addition (photoperoxidation system); Fe° (Fe°-reduction) and electrochemistry process (electrocoagulation system). It was used factorial design to optimize experimental conditions and the effects of variables were evaluated. The investigated variables were concentration of reagents and pH, in the Fenton, photoperoxidation, photoFenton e Fe°-reduction process (amination water, 50% v/v); electrode type and electrodes’s distance from each other, cell voltage and pH, in the electrocoagulation process (amination water, 25% v/v). It was adjusted an analytical procedure for the determination of the chemical oxygen demand, COD, for the samples containing a high saline level, propitiating the correction of the interference from chloride ion in a concentration range of approximately 15% (amination water). In standard samples, the results presented a relative standard deviation (RSD) of 10% and relative error of –3%. When using amination water samples the results presented a RSD of 7%. The applied process were evaluated through UV-vis spectra, COD, H2O2 consumption (Fenton, photoperoxidation, photo-Fenton process) and acute toxicity. All processes were positively affected by the increasing of concentration of reagents and decreasing of pH. The electrocoagulation process achieved better efficiency when shorter electrodes’s distances were used, higher voltages and extreme conditions of pH (alkaline conditions were better), independently of the electrode type tested. The experiments were carried out in semi-bach tank stirred reactor. This way, after 2 hours of treatment under optimized conditions (Fenton: 1000 mL; pH 5; 1500 mg H2O2 L-¹; 500 mg Fe²+ L-¹; photoperoxidation- T: 50°C; 500 mL; lamp power: 125 W; pH 5; 1600 mg H2O2 L-¹; photo-Fenton- 500 mL; lamp power: 125 W; 2500 mg L-¹ de H2O2; 300 mg L-¹ de Fe²+; Fe°-reduction- 1000 mL; 10000 mg Fe°; pH 5; electrocoagulation- 200 mL; voltage cell: 5 V; pH 9; stainless steel electrodes distance: 2 cm) the best results were, in relation to color reduction (λmax = 420 nm), electrocoagulation (96%), Fe°-reduction (96%), photo-Fenton (89%), Fenton (60%) e photoperoxidation (13%). In addition, the COD reduction showed better results when using electrocoagulation (60%), photo-Fenton (20%), Fe°-reduction (15%) e photoperoxidation (6%). Considering acute toxicity reduction, the best results were achieved through the electrocoagulation process. In all processes, the reactions’s kinetic was the limiting factor to achieve better efficiency.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESNeste trabalho, foram realizados estudos comparativos do desempenho de ferroprocessos, na conformação de corrente efluente (sob alta concentração) da produção do herbicida trifluralina (água de aminação, AA). Testou-se a utilização do ferro em sistema Fe+²/H2O2 (sistema Fenton); em foto-processo Fe+²/H2O2/UV (sistema fotoFenton), precedido da não-adição de Fe²+ (sistema de fotoperoxidação); Feo (sistema de Feo -redução) e em processos eletroquímicos (processo de eletrocoagulação). Utilizou-se planejamento fatorial na otimização das condições experimentais e na avaliação dos efeitos das variáveis envolvidas. As variáveis investigadas foram concentração dos reagentes e pH, nos processos Fenton, fotoperoxidação, fotoFenton e Fe°-redução (AA a 50% v/v); natureza e distância entre os eletrodos, diferença de potencial aplicada e pH, no processo de eletrocoagulação (AA a 25% v/v). Adequou-se procedimento analítico para a determinação da demanda química de oxigênio, DQO para amostras contendo um alto teor salino, propiciando correção de interferência causada pela presença de íon cloreto em uma faixa de concentração de aproximadamente 15% (AA). No caso de amostra padrão, obteve-se resultados com desvio padrão relativo, DPR, de 10% e erro relativo de –3%. No caso das amostras de AA, as determinações obtiveram DPR de 7%. Avaliou-se os processos aplicados através da análise do espectro UV-vis, da DQO, do consumo de H2O2 (processo Fenton, de fotoperoxidação e foto-Fenton) e da toxicidade aguda. De forma geral, todos os processos foram positivamente afetados pelo aumento da concentração dos reagentes e a diminuição do pH. O processo de eletrocoagulação obteve melhores rendimentos de degradação quando foram utilizadas menores distâncias entre os eletrodos, diferença de potencial (ddp) mais elevadas, condições extremas de pH (sendo mais adequadas, condições alcalinas), independendo da natureza dos eletrodos testados. Os experimentos formam realizados em reator do tipo tanque agitado, sendo que após 2 h de tratamento sob condições otimizadas (Fenton: 1000 mL; pH 5; 1500 mg H2O2 L-¹; 500 mg Fe²+ L-¹; fotoperoxidação- T: 50°C; 500 mL; Potência da lâmpada: 125 W; pH 5; 1600 mg H2O2 L-1; foto-Fenton500 mL; Lâmpada: 125 W; 2500 mg L-¹ de H2O2; 300 mg L-¹ de Fe²+; Fe°-redução1000 mL; 10000 mg Fe°; pH 5; eletrocoagulação- 200 mL; ddp: 5 V; pH 9; distância entre os eletrodos de aço inox: 2 cm) foi observado que os melhores rendimentos para redução de cor abosrciométrica (λmax. = 420 nm) foram obtidos pelos processos de eletrocoagulação (96%), Fe°-redução (96%), foto-Fenton (89%), Fenton (60%) e fotoperoxidação (13%). Em termos de redução da DQO, obteve-se melhores resultados através dos processos de eletrocoagulação (60%), foto-Fenton (20%), Fe°-redução (15%) e fotoperoxidação (6%). Considerando-se redução da toxicidade aguda tem-se como melhores resultados os obtidos através da eletrocoagulação (73%), Fe°-redução (60%), Fenton (aumento de 26%) e fotoFenton (aumento de 27%). Para todos os processos a cinética das reações foi o fator limitante para a obtenção de melhores rendimentos.Universidade Federal de Santa MariaBrasilQuímicaUFSMPrograma de Pós-Graduação em QuímicaCentro de Ciências Naturais e ExatasMartins, Ayrton Figueiredohttp://lattes.cnpq.br/2113532494494821Machado, Ênio LeandroDressler, Valderi LuizVasconcelos, Tibiriçá Gonçalves2022-11-22T14:03:18Z2022-11-22T14:03:18Z2002-08-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/27049porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2022-11-22T14:03:18Zoai:repositorio.ufsm.br:1/27049Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-11-22T14:03:18Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina Iron-process applied to degradation of effluent from trifluralin production |
title |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
spellingShingle |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina Vasconcelos, Tibiriçá Gonçalves Química Química analítica Herbicidas Trifluralina CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
title_full |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
title_fullStr |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
title_full_unstemmed |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
title_sort |
Ferro-processos aplicados à degradação de efluente da produção de trifluralina |
author |
Vasconcelos, Tibiriçá Gonçalves |
author_facet |
Vasconcelos, Tibiriçá Gonçalves |
author_role |
author |
dc.contributor.none.fl_str_mv |
Martins, Ayrton Figueiredo http://lattes.cnpq.br/2113532494494821 Machado, Ênio Leandro Dressler, Valderi Luiz |
dc.contributor.author.fl_str_mv |
Vasconcelos, Tibiriçá Gonçalves |
dc.subject.por.fl_str_mv |
Química Química analítica Herbicidas Trifluralina CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
topic |
Química Química analítica Herbicidas Trifluralina CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
In this work, comparative studies about the performance of iron-processes were carried out in the pre-treatment of effluent streams samples (under high concentration) from the trifluralin herbicide production (amination water). It was investigated the use of iron in the Fe²+/H2O2 system (Fenton process); in photoprocess Fe²+/H2O2/UV (photo-Fenton system), preceded of non-Fe²+ addition (photoperoxidation system); Fe° (Fe°-reduction) and electrochemistry process (electrocoagulation system). It was used factorial design to optimize experimental conditions and the effects of variables were evaluated. The investigated variables were concentration of reagents and pH, in the Fenton, photoperoxidation, photoFenton e Fe°-reduction process (amination water, 50% v/v); electrode type and electrodes’s distance from each other, cell voltage and pH, in the electrocoagulation process (amination water, 25% v/v). It was adjusted an analytical procedure for the determination of the chemical oxygen demand, COD, for the samples containing a high saline level, propitiating the correction of the interference from chloride ion in a concentration range of approximately 15% (amination water). In standard samples, the results presented a relative standard deviation (RSD) of 10% and relative error of –3%. When using amination water samples the results presented a RSD of 7%. The applied process were evaluated through UV-vis spectra, COD, H2O2 consumption (Fenton, photoperoxidation, photo-Fenton process) and acute toxicity. All processes were positively affected by the increasing of concentration of reagents and decreasing of pH. The electrocoagulation process achieved better efficiency when shorter electrodes’s distances were used, higher voltages and extreme conditions of pH (alkaline conditions were better), independently of the electrode type tested. The experiments were carried out in semi-bach tank stirred reactor. This way, after 2 hours of treatment under optimized conditions (Fenton: 1000 mL; pH 5; 1500 mg H2O2 L-¹; 500 mg Fe²+ L-¹; photoperoxidation- T: 50°C; 500 mL; lamp power: 125 W; pH 5; 1600 mg H2O2 L-¹; photo-Fenton- 500 mL; lamp power: 125 W; 2500 mg L-¹ de H2O2; 300 mg L-¹ de Fe²+; Fe°-reduction- 1000 mL; 10000 mg Fe°; pH 5; electrocoagulation- 200 mL; voltage cell: 5 V; pH 9; stainless steel electrodes distance: 2 cm) the best results were, in relation to color reduction (λmax = 420 nm), electrocoagulation (96%), Fe°-reduction (96%), photo-Fenton (89%), Fenton (60%) e photoperoxidation (13%). In addition, the COD reduction showed better results when using electrocoagulation (60%), photo-Fenton (20%), Fe°-reduction (15%) e photoperoxidation (6%). Considering acute toxicity reduction, the best results were achieved through the electrocoagulation process. In all processes, the reactions’s kinetic was the limiting factor to achieve better efficiency. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-08-02 2022-11-22T14:03:18Z 2022-11-22T14:03:18Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/27049 |
url |
http://repositorio.ufsm.br/handle/1/27049 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Química UFSM Programa de Pós-Graduação em Química Centro de Ciências Naturais e Exatas |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Química UFSM Programa de Pós-Graduação em Química Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1805922178334457856 |