چكيده به لاتين
According to the population increment, and also explosion of economic and industrial activities, the research on the wastewater treatment methods have been interested, in recent years. One of the current challenges of wastewater treatment is the presence of recalcitrant and stable pollutants which are difficult to remove using conventional treatment technologies. Accordingly, the last few years have seen intensified effort to develop more effective wastewater treatment technologies. The use of fluidized bed reactor in wastewater treatment, particularly advanced oxidation fenton processes treatment, represents unique opportunity for cost-effective treatment of wastewater containing recalcitrant pollutants and could help in addressing some of the drawbacks of the conventional treatment technologies. This investigation evaluates the effectiveness of the fluidized-bed Fenton process using SiO2 and glass bead carriers in treating the decolonization. Box-Behnken Design (BBD) was used to investigate the effects of important operating parameters on decolorization to optimize the system. In BBD experiment, pH range was 2/5–4/5, the Fe2+ concentration was 0.024-0.14mM and H2O2 concentration was 2–7mM. The optimized conditions were 4.25mM H2O2, 0.098mM Fe2+ at pH 2.8 using 200g (SiO2 including glass beads) for decolorization of Rhodamine B. The result showed that, pH, Fe2+ concentration and H2O2 concentration have more influence on decolorization of Rhodamine B, respectively. Decolorization of Rhodamine B followed first-order reaction kinetics. The decolorization efficiency and total iron removal of fluidized-bed Fenton and Fenton processes was compared and result showed that, the decolorization efficiency and total iron removal from fluidized-bed Fenton processes were 95.3% and 58%, respectively, where 14.8% and 21% more than fenton. EDX analysis showed that after treatment, Fe weight fraction percentage increased from0.06 to 2.2%, indicating that the iron was certainly precipitated on the surface of SiO2 carriers. These results show that the fluidized-bed Fenton process is better than the Fenton process in total iron removal
