The comparison of photooxidation processes for the minimization of organic load of colored wastewater applying the response surface methodology.

In this comparative study, the effectiveness of three photooxidation processes (UV/H(2)O(2), UV/S(2)O(8)(2-) and UV/O(3)) for degradation of an azo dye model pollutant was investigated using several process parameters. The process parameters such as initial pH, the concentrations of oxidant in the reactor inlet stream and the type of oxidant were considered. In order to investigate the influence of cross-factor effects of process parameters, the full factorial design was applied with three factors (two numeric and one categorical) at three levels combined with response surface modeling.