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.