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Wet oxidation of coking wastewater: Optimization of degradation parameters through RSM
Author : Vibha Verma *a, Raghvendra Singh Thakur b, Akanksha Agrawal a and Parmesh Kumar Chaudhari a
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ABSTRACT
Present study deals with the degradation of COD contained in coking wastewater using catalytic wet air oxidation process. The investigated experimental parameters were pH, temperature (T ºC), air partial pressure (pair), catalyst loading (Cw) and time (tR). Among various catalysts, copper chloride was found to best for degradation of COD. The optimum condition evaluated for the degradation of organic compounds using Response Surface Methodology (RSM) was T = 159.93ºC, pair = 5.80 MPa, Cw = 3.1 kg/m3 and tR = 5.98 h. The central composite design (CCD) was used for the experimental design and optimization of the process. Analysis and interaction between the four most important operating variables T, pair, Cw and tR were studied. ANOVA analysis of variance showed the good regression coefficient with R2 = 0.977 for the degradation of COD.
KEYWORD
Catalytic wet air oxidation, coking wastewater, response surface methodology, COD