ORIGINAL RESEARCH
Decolorization of Textile Dye Reactive Blue 221
by Bacteria Isolated from Anthropogenic
Dye-Contaminated Soil
Sadia Mumtaz, Noshaba Hassan Malik, Iffat Naz, Safia Ahmed
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Microbiology Research Laboratory, Department of Microbiology, Quaid-i-Azam University
Islamabad, 45320, Pakistan
Pol. J. Environ. Stud. 2015;24(4):1705-1716
KEYWORDS
ABSTRACT
The present study was conducted to evaluate the degradative potential of indigenous bacterial isolates
for Reactive Blue 221. The two strains proficient in decolorization (>80%) were isolated from a waste
disposal site by enrichment technique. Under optimized conditions, Pseudomonas sp. BDS 2 displayed efficient
decolorization activity of 94.4% in Minimal Salt Medium supplemented with 50 mg/l of RB 221 after
96 h of incubations, whereas 88.5% of color was removed by Alcaligenes sp. BDS 9 by the end of 112 h.
UV-Visible and FTIR spectroscopy confirmed that in the case of Pseudomonas sp. BDS 2 and Alcaligenes
sp. BDS 9, decolorization was the ultimate consequence of biodegradation and adsorption, respectively.
Toxicological studies revealed the nontoxic nature of degradative metabolites.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.