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http://repositorio.ufc.br/handle/riufc/71746
Tipo: | Artigo de Periódico |
Título : | Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30 °C) and thermophilic (55 °C) treatments for decolourisation of textile wastewaters |
Autor : | Santos, André Bezerra dos Bisschops, Iemke A. E. Cervantes, Francisco Javier Van Lier, Jules Bernardus |
Palabras clave : | Azo dye;Colour removal;Thermophilic;Mesophilic;Anaerobic;Redox mediator;Textile wastewater |
Fecha de publicación : | 2004 |
Editorial : | Chemosphere |
Citación : | SANTOS, André Bezerra dos; BISSCHOPS, Iemke A. E.; CERVANTES, Francisco Javier; VAN LIER, Jules Bernardus. Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30 °C) and thermophilic (55 °C) treatments for decolourisation of textile wastewaters. Chemosphere, [S. l.], v. 55, n. 9, p. 1149-1157, 2004. |
Abstract: | The impact of different redox mediators on colour removal of azo dye model compounds and textile wastewater by thermophilic anaerobic granular sludge (55 °C) was investigated in batch assays. Additionally, a comparative study between mesophilic (30 °C) and thermophilic (55 °C) colour removal was performed with textile wastewater, either in the presence or absence of a redox mediator. The present work clearly evidences the advantage of colour removal at 55 °C compared with 30 °C when dealing with azo coloured wastewaters. The impact of the redox mediators anthraquinone-2,6-disulfonate (AQDS), anthraquinone-2-sulfonate (AQS) and riboflavin was evident with all dyes, increasing decolourisation rates up to 8-fold compared with the mediator-free incubations. The generation of the hydroquinone form AH2QDS, i.e. the reduced form of AQDS, was extremely accelerated at 55 °C compared with 30 °C. Furthermore, no lag-phase was observed at 55 °C. Based on the present results we postulate that the production/transfer of reducing equivalents was the process rate-limiting step, which was accelerated by the temperature increase. It is conclusively stated that 55 °C is a more effective temperature for azo dye reduction than 30 °C, which on the one hand can be attributed to the faster production/transfer of reducing equivalents, but also to the decrease in activation energy requirements. |
URI : | http://www.repositorio.ufc.br/handle/riufc/71746 |
ISSN : | 0045-6535 |
Derechos de acceso: | Acesso Aberto |
Aparece en las colecciones: | DEHA - Artigos publicados em revista científica |
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Fichero | Descripción | Tamaño | Formato | |
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2004_art_absantos2.pdf | 325,07 kB | Adobe PDF | Visualizar/Abrir |
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