Degradation of Methyl Orange using Hydrodynamic Cavitation Technology Combined with Chlorine Dioxide Oxidation: Optimization Using Box–behnken Design (BBD)

Abstract

In the present work, the hydrodynamic cavitation technology combined with chlorine dioxide oxidation was proved to be an effective method to degrade the methyl orange (MO). The influencing factors in the main experimental process such as solution temperature (25-45 °C), inlet pressure (0.2-0.6 Mpa), reaction time (20- 60min) were investigated. Response surface methodology (RSM) based on Box-Behnken design (BBD) experiments were employed to optimize the experimental methods. The best performance of combined process for degradation of chlorine dioxide was achieved at temperature of 38.13 °C, inlet pressure of 0.4 Mpa and reaction time of 60min and the optimal degradation rate was 82.97% which was very close to the actual experimental result of 82.8% under the same experimental condition. The experimental results showed that BBD could optimize the experimental results well with high accuracy which may simplify the experimental step and a better experimental result could obtained.