Numerical Simulation And Application Of Fenton Fluidized Bed Reactor

"Water Pollution Prevention Action Plan"in particular to focus on remediation of the top ten polluting industries,such as coking,printing and dyeing and paper,and in the"three five"period to implement more stringent waste water discharge standards.At present,the relevant enterprises of the wastewater treatment are the traditional biological process,supplemented by a small amount of physical and chemical technology,the water contains a large number of difficult biodegradable organic matter,can not meet the increasingly stringent emission standards.Due to the Fenton technology research,Fenton fluidized bed based on iron ion on-line crystallization has attracted the attention of industry in terms of its green,high efficiency and mild reaction conditions.In this background,the development and operation of Fenton fluidized bed reactor were studied and simulated by CFD software.Finally,the Fenton fluidized bed magnification reactor was developed and applied.The study aims to solve the shortcomings of the existing devices,developed a more efficient,general,economical devices,and summed up the optimal operating conditions.Through the experiment and simulation,the following main contents are obtained?1?The effects of initial pH value,H₂O₂dosage and Fe²⁺dosage(pH,H₂O₂ and Fe²⁺)on the degradation of reactive red 3BS simulated dye wastewater were studied by the traditional homogeneous Fenton system.The optimum conditions were pH=3.5,H₂O₂=5mM and Fe²⁺=2.5mM.At this time,the removal rates of TOC and COD were 58%and73%,respectively.?2?The optimum conditions for the degradation of Reactive Red 3BS simulated dye wastewater were studied by Fenton fluidized bed reactor.The optimum conditions were as follows:pH=3.5,H₂O₂=2.5mM,Fe²⁺=1.0mM,HRT=60min,the swelling degree was100%and the loading was 300g/L,the TOC,COD and total iron removal rates were 62%,71%and 58%respectively.At the same time,the online crystallization of iron ions was confirmed by means of 3D microscopy,SEM and XRF.?3?The reactor pre-reaction zone,distributed supporting plate and fluidized area were simulated and optimized by means of CFD software.The optimal design combination,distributed tubular inlet,0.5mm aperture and other spacing cloth hole,the internal circulation of solid-phase fluidization;through the actual operation of the reactor to verify,verify the simulation results are reliable.?4?Based on CFD simulation,a Fenton fluidized bed pilot reaction device was developed.The results showed that the optimum operating conditions were pH=3.5,H₂O₂=2.5mM,Fe²⁺=1.0mM,HR=60min,reflux ratio=30,H₂O₂ pre-dosing method.At this time,TOC,COD and Total iron ramoval rates were65%,78%and 62%,respectively.?5?The Fenton fluidized bed magnification reactor was used for the study of the actual wastewater.The good treatment results showed that the optimized design of the Fenton fluidized bed magnification reactor had achieved initial success,and proved that the reactor had good versatility.