Evaluation of the efficiency of isolated bacterial consortium PMB11 in removal of colour, degradation and reduction of toxicity from textile dye effluent

Abstract

AbstractThe aim of the present study was to investigate the textile effluent degrading potential of an isolated bacterial consortium PMB11. The consortium had the capacity to decolourize various textile dyes and textile effluent. Ninetyone percent textile effluent decolourization was observed within 120 hours. The physiochemical characterization of textile effluent indicates reduction in the total hardness (CaCO3), fluorides, chlorides, sulphate, chemical oxygen demand, and biochemical oxygen demand of textile effluent after treatment with consortium PMB11. Induction in the activities of NADHdichlorophenolindophenol reductase, azoreductase, and aminopyrine N-demethylase was observed after decolourization, which indicates involvement of these enzymes in the decolourization and degradation process. The biodegradation of dyes from effluent was confirmed using various analytical techniques, such as UV-Vis spectroscopy, Fourier transform infrared spectroscopy, gas chromatography - mass spectroscopy, and HPLC. A phytotoxicity study was performed to confirm the less toxic nature of the degradation metabolites than the effluent.