Abstract
The present paper focuses on the use of fungus, Pleurotus ostreatus, to decolorize and degrade azo dye, Synazol Red HF6BN. Decolorization study showed that P. ostreatus was able to decolorize 96% Synazol Red HF6BN in 24 days. It was also found that 94% Synazol Red HF6BN containing dye effluent was decolorized by P. ostreatus after 30 days of incubation at room temperature. The enzyme exhibited highest activity at 70°C and at pH 6.0. The enzyme activity was enhanced in the presence of metal cations. High performance liquid chromatography analysis confirmed that this fungal strain is capable of degrading Synazol Red HF6BN dye into metabolites. The observation of no zones of inhibition on agar plates and growth of Vigna radiata in the presence of dye extracted sample indicated that the fungal degraded dye metabolites are nontoxic to beneficial micro-flora and plant growth. Therefore, P. ostreatus has promising potential in colour removal from textile wastewater containing azo dyes. Key words: Azo dyes, decolorization, Pleurotus ostreatus, bioremediation
Highlights
A great number of dyes and other chemicals are used in textile industry
The present paper focuses on the use of fungus, Pleurotus ostreatus, to decolorize and degrade azo dye, Synazol Red HF6BN
Decolorization study showed that P. ostreatus was able to decolorize 96% Synazol Red HF6BN in 24 days
Summary
A great number of dyes and other chemicals are used in textile industry. There are more than 100,000 commercially available dyes with over 10,000 different dyes and pigments used in industries, representing an annual consumption of around 7×105 tonnes worldwide (Akhtar et al, 2005). The azo dyes are considered the most important and a major group of dyes mostly used in industry, representing 70% of total dyes produced per year (Kumar et al, 2007; Dos Santos et al, 2007; Jadhav et al, 2007). They are extensively used in textile dyeing due to their favorable characteristics such as superior fastness to the applied fabric, high stability to light bright color, resistance to microbial attack, waterfastness and simple application techniques. Different techniques including almost all the known physical and chemical and biological techniques were described for decolorization and the final conclusion was that each process alone might not be able to meet the requirements (Peralta-Zamora et al, 2003)
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