Bioremediation of Textile Azo Dyes by Aerobic Bacterial Consortium Aerobic Degradation of Selected Azo Dyes by Bacterial Consortium

Abstract

An aerobic bacterial consortium consisting of two isolated strains (BF1, BF2) and a strain of Pseudomonas putida (MTCC1194) was developed for the aerobic degradation of a mixture of textile azodyes and individual azodyes at alkaline pH (9-10.5) and salinity (0.9-3.68 g/l) at ambient temperature (28 +/- 2 degrees C). The degradation efficiency of the strains in different media (mineral media and in the Simulated textile effluent (STE)) and at different dye concentrations were studied. The presence of a H2O2 independent oxidase-laccase (26.5 IU/ml) was found in the culture filtrate of the organism BF2. The analysis of the degraded products by TLC and HPLC, after the microbial treatment of the dyes showed the absence of amines and the presence of low molecular weight oxidative degradation products. The enzymes present in the crude supernatant was found to be reusable for the dye degradation.

Decolourization of textile effluent by a thermophilic bacteria Anoxybacillus rupiensis

“…The closest sequence relatives found by BLAST search was ''Anoxybacillus beppuensis''AAB243446 and Geobacillus tepidamansT, AY563003 (96.8% similarity), i.e., more than the level (3% distance) over which strains are generally attributed to separate taxa [36]. Except for G. tepidamans, the similarity between the isolated strain and other species in the genus Geobacillus was less than 91%.…”

Microbial Decolorization of Mixture of Dyes by an Application of Laccase through Bacillus subtillis ETL-1979 Isolated from Soil of Industrial Effluent Treatment Plant

“…In this study, soil samples were collected from the industrial effluent treatment plant. Other reports on the isolation of bacterial species showing laccase activity was carried out from rice rhizosphere [9], seawater [20], river sludge or top-soil containing organic litter [13], soil contaminated with dye and textile industry effluent and lignocellulosic wastes [30]. In our study, the spore laccase was used for the decolorization of anthraquinone and azo dyes without nutrition or redox mediators.…”

Microbial Decolorization of Various Dyes by a Bacillus subtilis Strain Isolated from an Industrial Effluent Treatment Plant

“…In this study, soil samples were taken at the factory of an industrial effluent treatment plant. Other reports on the isolation of bacterial species with laccase activity was focused on the rhizosphere of rice [9], seawater [21], river mud or top-soil containing organic waste [13], contaminated soil with dye and textile industry, and lignocellulosic waste effluents [30]. In our study, the spore laccase was used for the bleaching of an anthraquinone dye and azo dyes without the addition of nutrients or redox mediators.…”