Application of statistical experimental design to the treatment of bleaching kraft mill effluent using a mediated free radical system.
The aim of this work was to evaluate the effect of chelator mediated-Fenton reaction (CMFR) on the chemical oxygen demand (COD) removal from bleaching kraft mill effluent. Effluent treatments were carried out to study the effect of the chelator 3, 4-dihydroxyphenylacetic acid (DOPAC), Fe3+ and H2O2 concentrations on COD removal. For optimization of COD removal, the methodology of statistical experimental design was employed. The estimated second-order polynomial multiple regression model predicts a maximum COD removal of 75.5% (COD/COD0 = 0.245) at the confidence level of 95%. Analysis of variance (ANOVA) showed a good coefficient of determination (R2) value of 0.90, thus ensuring a satisfactory adjustment of the second-order regression model with the experimental data. Indeed, CMFR proved to be a potential process to treat industrial effluents characterized by its high COD.
Arantes
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Department of Biotechnology, Escola de Engenharia de Lorena, University of São Paulo-USP Lorena, Rodovia Lorena-Itajubá Km 74.5, CP 116, 12600-970 Lorena/SP, Brazil. arantes@debiq.faenquil.br
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D015102:3,4-Dihydroxyphenylacetic Acid / Q000494:pharmacology; D000704:Analysis of Variance; D002614:Chelating Agents / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005609:Free Radicals / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007220:Industrial Waste; D007501:Iron; D016877:Oxidants / Q000494:pharmacology; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D010209:Paper; D012044:Regression Analysis; D012107:Research Design / Q000706:statistics & numerical data*; D013499:Surface Properties; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D014876:Water Pollution / Q000517:prevention & control*
D002614:Chelating Agents; C045076:Fenton's reagent; D005609:Free Radicals; D007220:Industrial Waste; D016877:Oxidants; D014874:Water Pollutants, Chemical; D015102:3,4-Dihydroxyphenylacetic Acid; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen