Abstract
The present study clearly showed the existence of good scope for the bacterial consortium composed of Sphingomonas paucimobilis, Bacillus sp. and Staphylococcus epidermidis in the decolourization of textile wastewater. The full factorial plan method was used for the multiobjective optimization of bacteria with the decolourization process as response to explore a new optimization method of the mixed starter. The influence of temperature, agitation and pH on colour and chemical oxygen demand (COD) was investigated using 23 factorial designs. The contours curve generated by the software MINITAB corresponding to the manipulation at a fixed temperature of 28°C shows the optimal conditions for the decolourization which are: temperature 28°C, pH close to neutrality (7.2–7.25) and a restlessness that ranges from 100 to 150 rpm. The decolourization and the biodegradation yields increased with the developed consortium with yields of 100 and 75.76% of colour and COD removal, respectively.
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