Biossorção & biodegradação de azo corante: desenvolvimento de processos utilizando resíduos como fonte de microorganismos = Azo dye biosorption & biodegradation : process development with residues as source of microorganisms

• Ano de defesa: 2015
• Autor(a) principal: Santos, Graziely Cristina dos [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Biodegradation; Biodegradação; Corantes; Águas residuais - Purificação - Tratamento biológico; Indústria têxtil; Aminas
• Link de acesso: http://hdl.handle.net/11449/134180

The textile industries are among the ones which use the most water in their processes, in addition to many chemical products such as dyes, detergents, salts and mordant. Thus, great volumes of effluents are generated. Sometimes the wastewater treatment is not satisfactory. Numerous studies have been conducted to find more efficient and low-cost ways to treat textile wastewater. Biological treatments have been proven to be efficient, since some microorganisms have shown the ability to effluent decolorization. The present study aims to evaluate the decolorization process of the azo dye Direct Red 75 (DR75) 100 mg/L by different sources of microorganisms in different treatment systems in order to find an effective and low-cost alternative for the biological treatment of textile wastewater. The evaluation is presented in three chapters briefly described below. First chapter shows the comparison between two microorganisms. The fungus Phanerochaete chrysosporium and the fresh yeast Saccharomyces cerevisiae were the microorganisms used in the experiment of the first chapter, while a consortium of microorganisms obtained from an inoculum of food waste biodigester was used in the second chapter. Both experiments had DR75 as the only carbon source and results expressed as percentage of decolorization and absorbance ratio. Absorbance ratio, obtained by the ratio between the absorbance at a wavelength of the chromophore and azo groups, suggests the occurrence of biodegradation by varying the values of the samples compared to control. The results from chapter 1 showed that treatment with S. cerevisiae was more efficient, than P. chrysosporium and the absorbance ratio suggests the occurrence of biodegradation for both. Therefore, the DR75 was more easily biodegraded by fresh yeast that can be easily acquired, than by single strain of fungus, which seems to be an expensive and labored option for the treatment of textile wastewater. Analysis of ...