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Aplication of ▫$2^k$▫ factorial design in wastewater decolorization research [Elektronski vir]
Hribernik, Aleš, 1960- ; Bauman, Maja ; Lobnik, Aleksandra
This research deals with the decolorization of synthetic wastewater prepared with 1:2 metal complex textile dye C.I. Acid Blue 193 by AOP ozonation (O3) and H2O2/O3 process. In order to minimize the ...number of experiments, experiments were performed using the 25 factorial design. Five influential parameters were examined: initial dye concentration, ozone flow rate, initial pH value, decolorization time and H2O2 addition. According to the variance test analysis, only the first four parameters and their first and higher orderinteractions are significant, while the fifth factor, i.e. H2O2 addition,proved insignificant within the range examined in our tests. With the help of the significant factors, a regression model was constructed and model adequacy checked. The obtained regression polynomial was used to model the relation between absorbance and influential process parameters by fitting the response surface. Response surface may be used to predict absorbance resulted from a set of influential parameters, or it can be rearranged in such a way to predict the set of process decolorization parameters, necessary to reduce the absorbance of wastewater with the given initial dye concentration below the prescribed limit. It is also shown that 2k factorial design can be suitable to predict ozonation operating expenses. Keywords: wastewat
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