Abstract:-A Sequencing Batch Reactor (SBR) was combined with heterogeneous photocatalysis (TiO 2 /UV) as a tertiary treatment for a pencil manufacturer's wastewater. The SBR removed almost all Chemical Oxygen Demand (COD) from the wastewater, although color was barely removed. Photocatalysis was optimized using a factorial design. Final COD, Dissolved Organic Carbon (DOC), and color removals were 95%, 80%, and 93%, respectively. Treated wastewater showed no ecotoxicity towards Lactuca sativa. Color removal kinetics (ph… Show more
“…The success of the combined processes with TiO 2 is because they are complementary: The photocatalytic treatment removes color and the bioprocess removes carbon, improving the wastewater quality (Padovan & Azevedo, ). In addition, the photocatalytic pretreatment may improve the biodegradation of textile wastewater, though change the structures of the components, as observed by Ahmadi et al ().…”
Section: Resultsmentioning
confidence: 99%
“…Azo dyes, one class widely used in the textile industry, have high chemical and photolytic stabilities, making them recalcitrant, mutagenic, and difficult to remove using only one treatment method (Su, Low, Teng, & Wong, ). In the face of increasingly severe environmental legislation and growing consumer awareness, researchers haves focused on developing new strategies using a combination of treatment methods for more technical and economical alternatives (Padovan & Azevedo, ; Su et al, ).…”
Azo dyes, common in textile wastewater, have high photolytic and chemical stabilities, which make them difficult to be removed using conventional treatments. This study aims to evaluate a combined process using heterogeneous photocatalysis, with ZnO/UV or TiO 2 /UV (0.6 g catalyst L −1 solution/2-hr UV radiation), and a biological process for textile wastewater treatment. After the proposed treatments, the color and organic matter removals from synthetic wastewater (SW) and industrial wastewater (IW) were evaluated. For SW, the coupled photocatalytic (ZnO/UV or TiO 2 /UV)-biological system promoted a high extent of color removal (98%) and total organic carbon (TOC) reduction (>80%). Promising results were obtained with IW using combined photocatalytic (TiO 2 /UV)-biological treatments, reaching 97% and 63% of color and TOC removal, respectively. This process, coupling heterogeneous photocatalysis and a bioprocess, has proved to be a good alternative for the treatment of textile wastewater, not only for color removal but also for dye mineralization purposes.
• Practitioner points• A combined process using heterogeneous photocatalysis (ZnO/UV or TiO 2 /UV) and biological process was evaluated for synthetic (SW) and industrial (IW) textile wastewaters treatment. • For SW, coupled process promoted high extent of colour and organic matter removals. • For IW, promising results were obtained with TiO 2 /UV-biological treatment (97% of colour and 63% of organic matter removals).
“…The success of the combined processes with TiO 2 is because they are complementary: The photocatalytic treatment removes color and the bioprocess removes carbon, improving the wastewater quality (Padovan & Azevedo, ). In addition, the photocatalytic pretreatment may improve the biodegradation of textile wastewater, though change the structures of the components, as observed by Ahmadi et al ().…”
Section: Resultsmentioning
confidence: 99%
“…Azo dyes, one class widely used in the textile industry, have high chemical and photolytic stabilities, making them recalcitrant, mutagenic, and difficult to remove using only one treatment method (Su, Low, Teng, & Wong, ). In the face of increasingly severe environmental legislation and growing consumer awareness, researchers haves focused on developing new strategies using a combination of treatment methods for more technical and economical alternatives (Padovan & Azevedo, ; Su et al, ).…”
Azo dyes, common in textile wastewater, have high photolytic and chemical stabilities, which make them difficult to be removed using conventional treatments. This study aims to evaluate a combined process using heterogeneous photocatalysis, with ZnO/UV or TiO 2 /UV (0.6 g catalyst L −1 solution/2-hr UV radiation), and a biological process for textile wastewater treatment. After the proposed treatments, the color and organic matter removals from synthetic wastewater (SW) and industrial wastewater (IW) were evaluated. For SW, the coupled photocatalytic (ZnO/UV or TiO 2 /UV)-biological system promoted a high extent of color removal (98%) and total organic carbon (TOC) reduction (>80%). Promising results were obtained with IW using combined photocatalytic (TiO 2 /UV)-biological treatments, reaching 97% and 63% of color and TOC removal, respectively. This process, coupling heterogeneous photocatalysis and a bioprocess, has proved to be a good alternative for the treatment of textile wastewater, not only for color removal but also for dye mineralization purposes.
• Practitioner points• A combined process using heterogeneous photocatalysis (ZnO/UV or TiO 2 /UV) and biological process was evaluated for synthetic (SW) and industrial (IW) textile wastewaters treatment. • For SW, coupled process promoted high extent of colour and organic matter removals. • For IW, promising results were obtained with TiO 2 /UV-biological treatment (97% of colour and 63% of organic matter removals).
“…(Velloso, 2002). No igarapé do Quarenta foram observados vários indicadores de poluição das águas como o aumento do pH, alta condutividade, baixos teores de oxigênio dissolvido, altas concentrações de cátions e ânions e altas concentrações de metais (Cu, Cr, Zn e Ni) (Melo et al, 2005 (Soares et al, 2007;Padovan e Azevedo, 2015;Santos et al, 2006). A fotocatálise heterogênea é o processo que envolve reações redox induzidas pela radiação na superfície de semicondutores como, por exemplo, o TiO 2 que é um material grandemente empregado na degradação de poluentes devido ao seu baixo custo, alta estabilidade contra fotocorrosão e baixa reatividade (Nogueira e Jardim, 1996).…”
Section: Aplicação Em Amostras De áGuas Superficiaisunclassified
Revisão: Os Autores O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Conselho Editorial Ciências Humanas e Sociais Aplicadas APRESENTAÇÃO O grande desenvolvimento do nosso planeta, em diversas áreas, é devido principalmente ao desenvolvimento e utilização da Química. A Química possui papel fundamental no desenvolvimento tecnológico, pois a utilização dos conceitos e técnicas dessa ciência permite a obtenção de novas substâncias, além de preocupar-se com a prevenção de danos e exploração sustentável do meio ambiente. Os trabalhos selecionados para este volume oportunizam reflexão e conhecimento na área da Química, abrangendo aspectos favoráveis para ciência, tecnologia, sociedade e meio ambiente. Temas específicos são abordados em técnicas como eletrocatálise e degradação fotocatalítica. A toxicidade de compostos e análise de contaminantes emergentes é apresentada nos trabalhos com enfoque em tratamento de água e efluentes. Além disso, trabalhos tratam de síntese e sensores eletroquímicos. Inovações na química criam aplicações e soluções em diversas áreas, e pesquisas como as expostas neste volume contribuem para avanços tecnológicos. Com base nestes experimentos, convidamos você a ampliar ainda mais seus conhecimentos sobre Química e suas aplicações. Boa leitura.
“…In this liquid waste, EE2 can be found at a concentration of 5 mgL -1 (Nasuhoglu et al, 2012 The degradation of this compound has garnered attention, and several studies have utilized adsorption Ma et al 2016), biological (Larcher et al, 2013;Yi et al, 2011) and advanced oxidation processes for this purpose (Solcova et al, 2016;Pešoutová et al, 2014;Pessoa et al, 2014). Among these processes, advanced heterogeneous oxidation processes have been successfully used to remove water pollutants (Padovan and Azevedo, 2015;Gotostos et al, 2014;Miranda et al, 2013).…”
In this study, the photocatalytic oxidation by UV-activated TiOat pH 7. Ultraviolet-C (UVC) photolysis presented a removal of 40% in 2 h at pH 7 with the system operating in batch mode. Operating as a sequencing batch, the reactor showed remarkable efficiency in the removal of EE2 in a short period.
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