摘要：Azo dyes are synthetic in origin having complex aromatic structure and widely used in textile, paper,food, cosmetics and pharmaceutical industries. Most of the azo dyes used in textile industry arexenobiotic compounds and recalcitrant to conventional degradation process. These dyes causeserious environmental problems because of their carcinogenic nature and reduced penetration of lightin aquatic environment. In the present study, the efficiency of the two bacterial cultures on degradationof three different toxic azo dyes (acid, direct and reactive azo dyes) were analysed. The bacterialstrains used in this study are Escherichia coli and Pseudomonas putida. To increase the degradationpotential, the organisms were acclimatized to the dye environment for sufficient period by graduallydecreasing the nutrient broth concentration and increasing the dye concentration so that it caneffectively degrade dye rich textile effluent. The effect of concentration of dye, pH, temperature andagitation was studied to determine the optimal conditions for effective decolourisation and degradation.FT-IR and UV spectral analysis were performed to confirm the biodecolourisation.
