Decolorization of Remazol Black-B by Halomonas sp. PTCC1417 isolated from Urmia lake: Optimization by Taguchi methodology

Azo dyes account as the most dyes of all textile dyestuffs produced، and are the most common dye in textile industries. Azo dyes-containing effluents from these industries have caused serious environmental pollution. Compared with chemical/physical methods، biological processes have received more interest. Materials and method s: In this study، we investigated effects of four factors including temperature، pH، dye concentration، salt concentration on decolorization of Remazol Black B by Halomonas sp. PTCC1714. The optimization of dye decolorization in 16 experiments with different conditions was statistically analyzed using Taguchi design in Qualitek-4 software. The results showed that Halomonas sp. PTCC1714 was able to decolorize Remazol Black B in varying salt at 5–20% (w/v)، pH at 5-9، dye concentration at 100-5000 ppm and temperature 31-40 ˚C. The optimum factor levels were a dye concentration of 100 ppm، salt concentation 10 % (w/v) and pH 9 and temperature 31˚C. The predicted value obtained for dye decolorization under these conditions was about 94%. Discussion and It can be concluded that Halomonas sp. PTCC1714 has a high potential for decolorization of Remazol Black B from textile wastewater under different conditions.