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The present study focuses the dual applications of previously isolated fungal strain Aspergillus lentulus in decolourization of industrial waste water and xylanase production for pulp and paper industries. To explore the potential of A. lentulus for dye removal and to understand the mechanism involved, dye removal studies from dye solutions/mixtures and industrial effluents were performed using growing (ie bioaccumulation) as well as resting (ie biosorption) fungal biomass. The strain could efficiently (80.6—99.4%) remove various anionic and cationic dyes (singularly as well as in mixtures) during its growth, with the former being removed at a relatively faster rate. In depth investigations on the effect of process parameters on widely used Acid Navy Blue dye established that this strain could perform dye removal over a wide range of temperatures, pH, salt and dye concentration. Being alkali, thermo and halo tolerant …