Degrading azo dye by wet air oxidation: Application of response surface methodology

Abstract The most commonly used experimental design that is response surface methodology is aimed at optimization for degrading the dye. Using a sequence of designed experiments for getting an optimal response is the main purpose of this method. RSM was first introduced by Box and Wilson (1951). The current study focuses on examining the degradation of acid red 274 (AR274) which is an azo dye solution. The degradation of dye is investigated under the condition of WAO (wet air oxidation). WAO has been proved to be extremely efficient in TOC removal for wastewaters. It was developed by Zimmermann and its first industrial application appeared in the late 1950s. During this process, the oxidation of the components dissolved in water is done where O2 is used as the oxidizing agent. The CCD matrix, which is an experimental design beneficial in RSM, is enforced to estimate the temperature (100˚C to 300˚C), oxygen pressure (3 to 6 MPa), and time (40 to 120 min), and their interactive effects that are examined for dye degradation. In this review article, the focus is upon the estimation of the parameters well before the experimentation to reduce the cost as well as time during the real-time experiment of degradation of dye and to give a more precise and accurate result.