DYE DECOLOURIZATION BY USING RICE HUSK AND WHITE ROT FUNGI

Abstract

Synthetic dyes are used in the textile, food, paper, printing, drug, cosmetics and leather industries. Major classes of synthetic dyes including Azo, Anthraquinone dyes constitute more than 50% of those used in industrial applications. They are generally considered as xenobiotic compounds that are very recalcitrant against biodegradative processes. The ability of microorganism to decolourize and metabolize dyes has long been known, and the use of biodegradation based technologies for treatment of azo and Anthraquinone dyes have attracted interest. Within this study, we investigate the various techniques to decolourize the Azo and Anthraquinone dyes. Adsorption and Biodegradation are two important techniques for treating the effluent containing these synthetic dyes. Both have significant advantages as well as disadvantages. The combined application of these above two techniques has got an extra edge over the two processes separately. In the present study Reactive Orange 16(494 nm), Reactive Black 5(597 nm) and Remazol Brilliant Blue R (592 nm) have been biodegraded by using White Rot Fungi (Pleurotus Ostreatus) in the presence of Rice Husk. Simultaneous Adsorption and Biodegradation (SAB) has been studied against Adsorption. The effects of initial concentration, pH and adsorbent dose have been studied for SAB as well as for adsorption and are compared. The results show/hat the degradation of Reactive Orange 16(494 nm) is 94.5039 %, Reactive Black 5(597 nm) is 92.2644 % and Remazol Brilliant Blue R (592 nm) is 93.2691 % is possible at 35°C with 3 gm of adsorbent (Rice Husk) with initial concentration of 200 mg/1 in static condition and by use of SAB method. Results also show that a pH value of 4.5 is favourable for the adsorption of Reactive Orange 16(494 nm), Reactive Black 5(597 nm) and Remazol Brilliant Blue R (592 nm) dyes. The isothermal data could be well described by the Langmuir and Freundlich equations.