The Treatment Of Reactive Red2BF By Improved Photo-fenton System

At present, dye wastewater is one kind of the intraetable industrial wastewater in ourcountry.Azo dye is used widely in textile wastewater, with complicted structure, hardlybiochemical, high chemical stability and carcinogen. Therefore, it has far-reachingsignificance to find an efficient and economical technique of wastewater treatment toprotect the water environment.In this paper, the application of homogeneous and heterogeneous Fenton like processesfor the treatment of azo dye Reactive Red2BF as simulative research object were evaluated.The optimal conditions of application of solar-Fenton homogeneous system for thetreatment of azo dye Reactive Red2BF were:2BF concentration200mg/L, Fe²⁺concentration0.13mmol/L, H₂O₂concentration2.6mmol/L, pH3.0, the solar radiation at12to14o’clock in June to August in Dalian, and reaction time30min, the decolorizationrate and COD removal rate were respectively90.2%and59.2%.The optimal conditions of application of solar-EDTA-Fenton homogeneous system forthe treatment of azo dye Reactive Red2BF were:2BF concentration200mg/L, Fe²⁺concentration0.13mmol/L, H₂O₂concentration2mmol/L, pH3.0, EDTA concentration0.01mmol/L, the solar radiation at12to14o’clock in June to August in Dalian, andreaction time70min, the decolorization rate and COD removal rate were respectively92.4%and79.7%.The optimal conditions of application of solar-FeC₂O₄/Resin-H₂O₂heterogeneoussystem for the treatment of azo dye Reactive Red2BF were:2BF concentration200mg/L,H₂O₂concentration4mmol/L, catalyst dosage250mg/L, pH3.0, the solar radiation at12to14o’clock in June to August in Dalian, and reaction time30min, the decolorization rate andCOD removal rate were respectively94.5%and72%.In this paper, we studyed the reaction kinetics of the treatment for dye wastewater byheterogeneous Fenton system. It indicated that a pseudo-first order kinetic model has beenestablished, and half-time is15.9min. The study of kinetic provided the theoretical basis forthe application of heterogeneous Fenton system in the treatment of dye wastewater.