Abstract
In the present study, a widely used reactive dye, Color Index (C.I.) Reactive Blue 268 was utilized for mycoremediation by Aspergillus fumigatus isolated from textile effluent. Complete decolorization of the test dye (0.1 g L−1) was recorded within 6 days of static incubation at 27 °C in Czapek Dox broth (CDB). However, the isolate was unable to utilize the dye as a sole source of energy in Czapek Dox agar and CDB in absence of sucrose and obligate requirement of a labile carbon source, i.e., sucrose needed for induction of decolorization. Biosorption seems to play the pivotal role in decolorization as evident by coloring of the fungal biomass as that of dye color. The optimal conditions for the highest decolorization were found at 30 °C and pH 6.0 with 6-day-old inoculums supplemented with sucrose (10 g L−1) and ammonium chloride (2 g L−1) as a carbon and nitrogen source, respectively. The response of the isolate to increasing dye concentrations was found to be growth inhibitory. Surprisingly, about 65 % of dye decolorization was recorded with heat-inactivated biomass powder within 6 days of static incubation supporting the fact of fungal biosorption. Results of this study have established the candidature of the isolate for biotechnological removal of dyes from disreputable dying effluents.
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Acknowledgments
The authors are grateful to the Ministry of Science and Technology, Bangladesh, for financial assistant under the project “Bio-decolorization of textile reactive dyes” [Grant Number: 39.012.002.01.03.019.2013-281(145)] in the fiscal year 2013–2014.
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Ekramul Karim, M., Dhar, K. & Towhid Hossain, M. Co-metabolic decolorization of a textile reactive dye by Aspergillus fumigatus . Int. J. Environ. Sci. Technol. 14, 177–186 (2017). https://doi.org/10.1007/s13762-016-1136-7
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DOI: https://doi.org/10.1007/s13762-016-1136-7