Sunday, July 29, 2007
P57
Decolorization of Textile Dyes and Simulated Effluent by Trichosporon yeast in submerged culture. A Chelator-Mediated Fenton Reaction?
H. F. Pajot1, L.I.C. de Figueroa1, F. Siñeriz2, and J. I. Fariña1. (1) Fungal Biotechnology, PROIMI-CONICET, Av Belgrano y Pje Caseros, S.M. Tucumán, Argentina, (2) Environmental Microbiology, PROIMI-CONICET, Av Belgrano y Pje Caseros, S.M. Tucumán, Argentina
Synthetic dyes are extensively used in many industrial applications including textile dyeing. Typically 5-10% of total annual dye production is discharged in industrial effluents. The structural diversity of synthetic dyes is derived from the use of different chromophoric groups (i.e. azo, anthraquinone, etc.). Some of them are toxic and the majority is recalcitrant to direct microbial degradation. Thus, the improvement of existing technologies and/or even the development of new ones in order to degrade these compounds have become imperative.
During the last few years Chelator-Mediated Fenton reactions (CMFRs), have been suggested as a promising alternative methodology. On this context, the present research has evaluated the participation of siderophores produced by a Trichosporon decolorizing yeast during the decolorization process in liquid cultures in the presence of 3 textile dyes and a simulated effluent.
Chelators produced by Trichosporon were identified as siderophores based on the positive reaction obtained using FeCl3 test and CAS assay. In order to characterize them, further assays were carried out to evaluate the presence of catecholates, hydroxamates and oxalic acid. Under the experimental conditions used, complete decolorization of both, individual dyes and a simulated effluent, was observed with CMFR but not using the classical, non-mediated, Fenton reaction.
Results obtained in the present work allow us to conclude that CMFR involving siderophores produced by Trichosporon may be suitable not only for decolorization of recalcitrant single dyes but also for bioremediation of complex dye mixtures as those found in textile industry effluents.
During the last few years Chelator-Mediated Fenton reactions (CMFRs), have been suggested as a promising alternative methodology. On this context, the present research has evaluated the participation of siderophores produced by a Trichosporon decolorizing yeast during the decolorization process in liquid cultures in the presence of 3 textile dyes and a simulated effluent.
Chelators produced by Trichosporon were identified as siderophores based on the positive reaction obtained using FeCl3 test and CAS assay. In order to characterize them, further assays were carried out to evaluate the presence of catecholates, hydroxamates and oxalic acid. Under the experimental conditions used, complete decolorization of both, individual dyes and a simulated effluent, was observed with CMFR but not using the classical, non-mediated, Fenton reaction.
Results obtained in the present work allow us to conclude that CMFR involving siderophores produced by Trichosporon may be suitable not only for decolorization of recalcitrant single dyes but also for bioremediation of complex dye mixtures as those found in textile industry effluents.
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