Experimental Investigation
and statistical Regression analysis for the reduction of COD from paper and pulp
industry waste water using Advanced Oxidation Process
Gowtham B.
Res. J. Chem. Environ.; Vol. 29(5); 104-110;
doi: https://doi.org/10.25303/295rjce1040110; (2025)
Abstract
This study investigates the reduction of COD level in the paper and pulp industry
waste water using the advanced oxidation process. The experimental values were compared
with the predicted values obtained with the statistical regression analysis. The
Fenton process which is an advanced oxidation process, is used here for the reduction
of COD. In this process, the Fenton’s reagent (Iron and Hydrogen peroxide) is capable
of producing hydroxy radicals and the produced hydroxyl radicals have the ability
to oxidise the organic compounds and to reduce the COD level in the waste water.
The process depends on the different experimental parameters such as pH, concentration
of hydrogen peroxide (H2O2), concentration of iron (Fe) and the contact time. All
the experimental parameters were optimized by conducting a batch study in the lab
scale.
From the optimization studies, it is found that the maximum reduction of COD is
obtained at pH 3, 140 mL of FeSO4, 60 mL of H2O2 and contact time of 75 minutes.
At pH 3, the reduction efficiency is 95%, 89% for 140 mL of FeSO4, 91% for 60 mL
of H2O2 and 96% at 75 minutes. Further, statistical regression analysis was also
done to confirm the reliability of the experimental results. From the regression
analysis and the standard residual plot, it is found that the values are within
the 5% level of significance and it follows alternative hypothesis.
