Abstract
The yeast Candida rugosa, deposited in the Collection of Reference Microorganisms on Health Surveillance from Oswaldo Cruz Foundation under accession number INCQS 71011, was isolated from a sediment sample from Caldeirao Escuridao, a pristine water reservoir in the surroundings of Serra da Capivara National Park, and was identified based on molecular, physiological and morphological characterization. In addition, it was tested regarding its capacity to degrade three textile azo dyes, namely Reactive Red 198, Reactive Red 141, and Reactive Blue 214 at a concentration of 100 mg l-1 during 7 days of incubation. C. rugosa INCQS 71011 was highly efficient towards two azo dyes tested, Reactive Red 198 and Reactive Red 141, demonstrating potential as a biological treatment agent of textile effluent. These results are pioneers for the yeast C. rugosa, since its degradation capacity of textile azo dyes has not yet been described. In addition, this study provides important evidence that fungi from non-impacted areas can efficiently degrade azo dyes.
Highlights
Wastewaters from textile industries are a complex mixture of several pollutants such as heavy metals, pigments, and dyes (Coulibaly et al, 2003)
C. rugosa INCQS 71011 was highly efficient towards two azo dyes tested, Reactive Red 198 and Reactive Red 141, demonstrating potential as a biological treatment agent of textile effluent
Positive results for textile dye decolorization were obtained using fungi isolated from non-impacted areas (Pajot et al, 2011; Martorell et al, 2012), as obtained in the present study
Summary
Wastewaters from textile industries are a complex mixture of several pollutants such as heavy metals, pigments, and dyes (Coulibaly et al, 2003). The potential of pollution from textile dyes has been acknowledged primarily due to possible problems towards human and environmental health (Banat et al, 1996; Meehan et al, 2000; Stolz, 2001). Effluents discharged by textile industries, if not treated properly, can contain large quantities of hazardous chemical compounds 1997; Aksu and Dönmez, 2003). There is a necessity to develop better treatment technologies to remove color from industrial effluents that prove technically and economically satisfying as treatment technology. Several emerging approaches such as advanced oxidation process, membrane filtration, photocatalysis, and sonication, are being proposed and tested at different stages of commercialization (Anjaneyulu et al, 2005)
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