The application of response surface methodology for the optimization of an anaerobic biological process for the treatment of a reactive azo dye containing wastewater

The effect of initial dye, glucose and MLSS concentrations at three levels on the decolourisation efficiency and COD removal in a process in which a synthetic wastewater containing Reactive black 5 was anaerobically treated using activated sludge was studied using central composite design methodology. Statistical analysis of the data showed that glucose and MLSS concentrations had a significant effect on both the dye decolourisation efficiency and COD removal. The interaction between dye and glucose was important in the dye decolourisation process whereas there was interaction between glucose and MLSS in both the dye decolourisation and COD removal processes. Regression models were presented for prediction of both the dye decolourisation and COD removal as a function of the different coded levels of the three factors. The dye, glucose and MLSS concentrations (in mg/l) which resulted in the highest RB5 decolourisation efficiency of 99.8% were predicted as 130.8 mg/l, 546.9 mg/l and 3022.6 respectively.

کلیدواژه ها:

Activated Sludge ، Azo Dye Decolorization ، Reactive Black 5 ، CCD ، COD Removal