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Basic Research Journal of Microbiology ISSN 2354-4082Vol. 4(5), pp. 47-63 August 2017

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Full Length Research Paper

Alkaliphilic degradation of mixed reactive dyes (C.I.RY 125 and C.I.RB 52) by a moderately alkaliphilic bacterial consortium – optimization and bench scale studies


Sujatha Boopalan, Veena Gayathri Krishnaswamy, and Vidya Vasudevan


Department of Biotechnology, Stella Maris College, Chennai 86, Tamil Nadu, India


*Corresponding author: veenagayathri@yahoo.com


Received 6 August, 2017; Accepted 05 September, 2017; Published 14 September, 2017




Harmful effects of textile industry effluents are a huge problem nowadays. The recalcitrant nature of modern synthetic dyes has led to the imposition of strict environmental regulations. There is a need to devise cost-effective processes to remove the colour from wastewater produced by the textile industry. Microbial decolorisation of the dyes has been proved to break down complex organic compounds into completely harmless state. Textile effluents contain toxic chemicals and have very acidic and alkaline organic contaminants. Currently enormous interest has been encouraged on the decolourisation of dyes by alkaliphilic bacterial strains. The main objective of the present work is to reduce the colour of the reactive dyes under alkaline conditions. The capabilities of bacterial consortium were explored for the decolorization of textile mixed reactive dyes (C.I.RY 125) and (C.I.RB 52). The decolorization of azo dyes was studied at various concentrations (100–500ppm). The maximum decolorization of reactive azo dyes (C.I.RY 125dye) and (C.I.RB 52dye) were 79.6% and 77.7% respectively. Also optimization and bench scale bioreactor studies were done to test the effect of parameters like pH, temperature, C and N sources on the COD removal efficiency. The bacterial consortium was subjected to an application of 100ppm of the mixed dyes for 5 days. Decolorization of the mixed reactive azo dyes (C.I.RY 125) and (C.I.RB 52) and its intermediates were confirmed by FT-IR analysis. The bacterial strains present in the consortium were biochemically characterized and identified by 16s rRNA sequencing. Such alkaliphilic bacterial consortia can be applied in the removal of reactive azo dyes from contaminated alkaline environment.


Keywords: Reactive azo dyes, C.I.RY 125, C.I.RB 52, Bacterial consortium, Textile effluent, Decolorization, Alkaliphilic.


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Basic Research Journal of Business Management and Accounts.

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J. Microbiol.

Vol.4 No 5

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