O3/UV-type POAs integrated with catalytic material based on scrap iron and mineral clay to degrade 2,4 and 2,6-dinitrotoluene in Red Water
Revista Ambiente E Água
O3/UV-type POAs integrated with catalytic material based on scrap iron and mineral clay to degrade 2,4 and 2,6-dinitrotoluene in Red Water
Autor Correspondente: Jilvana Bárbara Walter | [email protected]
Palavras-chave: DNT degradation; explosives industry effluent; Scrap zero-valent iron
Resumos Cadastrados
Resumo Português:
Os compostos nitroaromáticos possuem importante relevância econômica e industrial fazendo parte de diversos insumos como corantes, tintas, agroquímicos e explosivos. Na fabricação do explosivo 2,4,6 trinitrotoluneo (TNT), há a formação de águas residuárias contaminadas de difícil tratamento por conter, dentre outros compostos, elevadas concentrações de 2,4 e 2,6-trinitrotolueno (DNT). Neste trabalho foi estudada a aplicação de Processos oxidativos avançados do tipo O3/UV em integração sequencial com material catalítico a base de escória de ferro metálico (SZVI) e matriz mineral, para o tratamento de um efluente industrial oriundo da indústria de explosivos contaminado com compostos nitroaromáticos. Foram estudados dois tipos de composição de matriz mineral, caulinita (Kau) e pedra pomes em pó (Pum), tendo sido observado, nas condições de melhor eficiência (O3/UV-SZVI/Kau), 100% de remoção tanto dos compostos dinitroaomáticos quanto de ozônio residual. Por outro lado, a foto-ozonização isoladamente, foi capaz de remover apenas parcialmente estes componentes, tendo sido observados 38% de remoção de DNT e 3,2 mg/L de O3 residual, comprovando a importância da integração com a matriz catalítica para um tratamento mais efetivo do efluente em estudo.
Palavras-chave: degradação de DNT; efluentes da indústria de explosivos; escória de ferro
Resumo Inglês:
Nitroaromatic compounds have significant economic and industrial relevance in various inputs such as dyes, inks, agrochemicals, and explosives. In the manufacture of the explosive 2,4,6 trinitrotoluene (TNT), there is the formation of contaminated wastewater that is difficult to treat because it contains, among other compounds, high concentrations of 2,4 and 2,6-trinitrotoluene (DNT). In this work, the application of advanced oxidation processes of the O3/UV type was studied in sequential integration with catalytic material based on metallic iron slag (SZVI) and mineral matrix to treat an industrial effluent from the explosives industry contaminated with compounds nitroaromatics. Two types of mineral matrix composition were studied, kaolinite (Kau) and pumice powder (Pum), having been observed in the conditions of best efficiency (O3/UV-SZVI/Kau) 100% removal of both nitroaromatic compounds and residual ozone. On the other hand, photo-ozonation alone could only partially remove these components, with 38% DNT removal and 3.2 mg/L residual O3 observed, proving the importance of integration with the catalytic matrix for more effective treatment of the studied effluent.
Keywords: DNT degradation; explosives industry effluent; Scrap zero-valent iron
Resumo Espanhol:
Nitroaromatic compounds have significant economic and industrial relevance in various inputs such as dyes, inks, agrochemicals, and explosives. In the manufacture of the explosive 2,4,6 trinitrotoluene (TNT), there is the formation of contaminated wastewater that is difficult to treat because it contains, among other compounds, high concentrations of 2,4 and 2,6-trinitrotoluene (DNT). In this work, the application of advanced oxidation processes of the O3/UV type was studied in sequential integration with catalytic material based on metallic iron slag (SZVI) and mineral matrix to treat an industrial effluent from the explosives industry contaminated with compounds nitroaromatics. Two types of mineral matrix composition were studied, kaolinite (Kau) and pumice powder (Pum), having been observed in the conditions of best efficiency (O3/UV-SZVI/Kau) 100% removal of both nitroaromatic compounds and residual ozone. On the other hand, photo-ozonation alone could only partially remove these components, with 38% DNT removal and 3.2 mg/L residual O3 observed, proving the importance of integration with the catalytic matrix for more effective treatment of the studied effluent.
Keywords: DNT degradation; explosives industry effluent; Scrap zero-valent iron
