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Advanced Oxidation of Tannery Wastewater for COD Reduction

R. Elliss Yogesh, Dr.V. Sekaran and S. Shyam Sundar


Abstract:

In this study, the treatment efficiency of tannery wastewater by advanced oxidation process using various catalysts was evaluated with the help of COD removal efficiency. The catalysts used in this study are of two forms: homogeneous catalyst and heterogeneous catalyst. The Fe2+solution & Fe2+/Cu2+equimolar solutions were used as homogeneous catalyst and iron powder, copper coated iron powder were used as heterogeneous catalyst. The H2O2 was used as an oxidizing agent throughout this study. The experiments were conducted with different molar ratios and the COD reduction of each experiment was identified. In order to enhance the reaction kinetics, the UV irradiation was also employed. The oxidation of the effluent using H2O2/sunlight without the presence of catalyst shows 27.6% of COD reduction. From the advanced oxidation experiments, it was observed that the treatment with UV illumination such as Photo Fenton oxidation (PFO) and Photo Fenton like oxidation (PFLO) gives best result of 93.2% and 95.8% of COD reduction respectively. These results are significantly higher when compared to non-photolytic Fenton and Fenton like oxidations. Finally from the results it was observed that the bimetallic heterogeneous catalyst dose of 10g/L with 1:3 COD: H2O2 molar ratio works well under photolytic actions and produces a maximum COD removal of 95.8% when compared to all other experiments.

Keywords: Tannery, COD, Fenton Catalyst, Oxidation, Wastewater.

Volume: 5 | Issue: 1

Pages: 750-758

Paper ID : IJPPAS104998

Issue Date: February , 2017

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