Optimization of Decolorization (Somnauk’s Red Dye No. 9) Using Fenton-Like Reaction Over Iron Powder by Box-Behnken Design (BBD)
Keywords:
Fenton-Like reaction, Degradation of dye, Iron-powderAbstract
The objective of this study was to find the optimal condition for Somnauk’s red dye No. 9 (SR09) decolorization using Fenton-like process. The experiments were performed in a batch reactor. A set of experiment was designed using Box–Behnken design (BBD) and the response surface analysis was used to optimize for the maximum decolorization efficiency. An initial pH of solution, an amount of iron-powder, and an initial H2O2 dose were selected to be the independent variables while decolorization efficiency was considered as the response of functions. The initial concentration of SR09, and the reaction time were kept constant of 100 ppm and 2 hour, respectively. It was found that decolorization efficiency increased with an increasing of H2O2 dose and a catalyst loading however it decreased when the H2O2 dose and catalyst loading were up to a certain level. High concentrations of iron-powder and high H2O2 dose adversely affected to the decolorization efficiency due to both of them were acting as hydroxyl radical scavenging. The results were agreed well with a quadratic model (R2= 0.985). The optimal pH, catalyst loading, and H2O2 dose were found to be 3, 0.464 g/L, and 45.5 mM, respectively, and the 96±0.53% removal efficiency was achieved. Decolorization efficiency through iron-powder/H2O2 process was not decreased significantly even after 5 successive cycles, moreover, it was found that leached iron and TOC (Total organic carbon) were less than 2 ppm and 10 mg/L in each batch respectively. The wastewater after treatment is compliance with the Thailand-industrial estate water discharging standard.
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