Potencial biossotivo e biodegradativo da Saccharomyces cerevisiae imobilizada em alginato de cálcio e em células livres na remoção de corantes têxteis de efluente
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Data
2010-03-29
Autores
Rodrigues, Heide Dayane Prates [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho apresenta uma avaliação comparativa do potencial biossortivo e biodegradativo da levedura Saccharomyces cerevisiae na remoção de corantes têxteis de efluentes quando imobilizada em alginato de cálcio e quando em célula livre. Para isto foram preparadas soluções experimentais dos corantes Acid Blue 40 e Acid Red 151, com concentrações equivalentes a 100 μg/mL e a estas foram adicionadas esferas com a levedura imobilizada a partir de uma suspensão 10% e gotas de células livres a partir de uma suspensão 2%. Os testes comparativos de remoção dos corantes foram analisados através de espectrofotômetros Ultravioleta- Visível e Infravermelho com Transformada de Fourier, com os quais foi possível determinar a porcentagem de remoção dos corantes das soluções, os valores das Absorbâncias Relativas que revelaram se o processo predominante na descoloração foi o da biossorção e/ou biodegradação, a quantidade de biomassa em miligramas (peso seco) necessária para fazer a remoção total da cor e também determinar as alterações moleculares ocorridas nas estruturas dos corantes após os tratamentos. Os resultados mostraram que a maior porcentagem de descoloração alcançada para o Acid Blue 40 foi de 61,7% após 360 horas de tratamento com 20 esferas com a levedura imobilizada e para o Acid Red 151 foi de 81,9% após 216 horas de tratamento também com 20 esferas com o microrganismo imobilizado. Através dos valores das Absorbâncias Relativas foi possível verificar que o processo predominante na remoção da cor do Acid Blue 40 com 72 horas de tratamento com 10 e 20 esferas com Saccharomyces cerevisiae imobilizada foi o da biossorção seguido da biodegradação e para o Acid Red 151 com esse mesmo tempo de tratamento e com a mesma quantidade de biomassa imobilizada foi o da biodegradação. A quantidade de biomassa imobilizada e livre...
This paper presents a comparative assessment of the biodegradative and biosorptive potential of the yeast Saccharomyces cerevisiae in textile dyes removal of effluents when in immobilized alginate and in free cells. Therefore, experimental solutions were prepared with concentrations of the dye Acid Blue 40 and Acid Red 151 equivalent to 100 mg/mL and those were added with beads containing the immobilized yeast from a 10% suspension and drops of free cells from a 2 % suspension. Comparative tests of dye removal were analyzed by UV-Visible spectrometers and Infrared Fourier Transform on which it was possible to determine the percentage of dye removal from the solutions, the values of Relatives Absorbances that the discoloration have been proved to predominant by biosorption and / or biodegradation, the amount of biomass in milligrams (dry weight) required for a complete color removal and also to determine the molecular changes occurring in the dye structures after the treatment. The results showed that the highest decolorization percentage achieved for Acid Blue 40 was 61.7% after 360 hours of treatment with 20 immobilized yeast beads and for the Acid Red 151 it was 81.9% after 216 hours of treatment with 20 beads also with immobilized microorganism. Through the values of Relatives Absorbances it was concluded that the predominant process in dye removal of Acid Blue 40 in 72 hours of treatment with 10 and 20 beads containing imobilized Saccharomyces cerevisiae was the biosorption followed by biodegradation and in Acid Red 151 with the same treatment time and the same amount of immobilized biomass it was the biodegradation. The amount of immobilized and free biomass to obtain total removal of Acid Blue 40 solution was 87 and 38 mg/mL, respectively, and to completely remove the Acid Red 151, the required amount of free and immobilized biomass was 64 and 2 mg/mL, respectively, which... (Complete abstract click electronic access below)
This paper presents a comparative assessment of the biodegradative and biosorptive potential of the yeast Saccharomyces cerevisiae in textile dyes removal of effluents when in immobilized alginate and in free cells. Therefore, experimental solutions were prepared with concentrations of the dye Acid Blue 40 and Acid Red 151 equivalent to 100 mg/mL and those were added with beads containing the immobilized yeast from a 10% suspension and drops of free cells from a 2 % suspension. Comparative tests of dye removal were analyzed by UV-Visible spectrometers and Infrared Fourier Transform on which it was possible to determine the percentage of dye removal from the solutions, the values of Relatives Absorbances that the discoloration have been proved to predominant by biosorption and / or biodegradation, the amount of biomass in milligrams (dry weight) required for a complete color removal and also to determine the molecular changes occurring in the dye structures after the treatment. The results showed that the highest decolorization percentage achieved for Acid Blue 40 was 61.7% after 360 hours of treatment with 20 immobilized yeast beads and for the Acid Red 151 it was 81.9% after 216 hours of treatment with 20 beads also with immobilized microorganism. Through the values of Relatives Absorbances it was concluded that the predominant process in dye removal of Acid Blue 40 in 72 hours of treatment with 10 and 20 beads containing imobilized Saccharomyces cerevisiae was the biosorption followed by biodegradation and in Acid Red 151 with the same treatment time and the same amount of immobilized biomass it was the biodegradation. The amount of immobilized and free biomass to obtain total removal of Acid Blue 40 solution was 87 and 38 mg/mL, respectively, and to completely remove the Acid Red 151, the required amount of free and immobilized biomass was 64 and 2 mg/mL, respectively, which... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Microorganismos, Biodegradação, Corantes, Corantes têxteis, Imobilização celular, Biossorção, Alginato de cálcio, Textile dyes, Immobilization, Biosorption, Biodegradation, Calcium alginate
Como citar
RODRIGUES, Heide Dayane Prates. Potencial biossotivo e biodegradativo da Saccharomyces cerevisiae imobilizada em alginato de cálcio e em células livres na remoção de corantes têxteis de efluente. 2010. 79 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2010.