Aerobic Biodecolorization of Mixture of Azo Dye Containing Textile Effluent using Adapted Microbial Strains

摘要

The current study aimed at developing a microbial consortium using indigenously adapted microbial populations which could be used in the treatment of azo dye containing textile effluent under aerobic conditions. From about 265 different bacterial isolates, 3 organisms ( Bacillus sp., Pseudomonas sp. and Alcaligenes sp.) and from 35 different fungal isolates and two fungal strains ( Aspergillus sp. and Penicillium sp.) were selected. Around 26 different combinations were developed using permutation and combination and the efficient combination was identified based on the reduction of various physico-chemical parameters (Chemical Oxygen Demand, Hardness, Total Solids, Total Suspended Solids, Total Dissolved Solids, pH, Color and Turbidity). There was a gradual increase in the percentage of reduction in all the parameters from the first day onwards and after the fifth day there was no considerable reduction in the parameters. One of the combinations A13 was found to be the efficient combination capable of reducing all the parameters to a significant extent. Also the toxic end product in the treated effluent was found to be negative which was confirmed by HPLC analysis. It could thus be ascertained from this study that the recalcitrant nature of the azo dye could be over come even in an aerobic condition with the enrichment of selected combination of microbes in the treatment plant. Usage of such a consortium helps us in treating the azo dyes in a cost effective manner.