Study On Oxidation Degradation Of Dye Wastewater And Landfill Leachate By Fe～(3+)/Cu～(2+)/H₂O₂ System

The essay first analyzes and evaluates various techniques and methods to treat toxicorganic sewage difficult to degradation in China and other countries, then focuses on 3dtransfer orbit ions' catalytic ability and the feasibility of treating toxic organic sewagedifficult to dissolve with the Fe³⁺/Cu²⁺/H₂O₂ system. It also discusses seven kinds of 3dmetel ions and the influence factors and its functions of Fe³⁺/Cu²⁺/H₂O₂ system, Kineticof oxidation degradation and catalytic reaction mechanism in the experiments with dyewastewater sewage and landfill leachate as the research objects respectively.The catalytic ability of seven kinds of 3d transfer orbit ions from strong to weakthrough the experiments is Fe³⁺＞Cu²⁺＞Co²⁺＞Mn²⁺＞Cr³⁺＞Ni²⁺＞Zn²⁺. Based on theresearch of the effects of pH, oxidizing agent, ions, temperature, the first order kineticmodel and the second order kinetic model of catalytic oxide reaction have been got. Andthe activation energy of all the metel ions have been got with the first order kinetic model.The order of the metel ions affected by temperature according to activation energy fromthe strong to the weak is as follows: Cr³⁺＞Mn²⁺＞Co²⁺＞Cu²⁺＞Ni²⁺＞Zn²⁺＞Fe³⁺. The essayalso studies the catalytic ability of the three different combined catalytic system—Fe³⁺/Cu²⁺,Fe³⁺/Co²⁺,Fe³⁺/Mn²⁺ and get the result of order of the efficency of degradation andthe ability of counter assault: Fe³⁺/Cu²⁺＞Fe³⁺/Co²⁺＞Fe³⁺/Mn²⁺, among-which Fe³⁺/Cu²⁺has the greatest practicability.The essay studies dye wastewater sewage of four different structures Acid Orangeâ…¡,Alizarin Violet,Neutral Red,Fuchsin Basic with the techniques of catalytic oxideFe³⁺/H₂O₂, Cu²⁺/H₂O₂, Fe³⁺/Cu²⁺/H₂O₂ and examines the original PH value, period ofresponse and the effects of different proportion of Fe³⁺and Cu²⁺ on the process to treatsewage and explores the process of techniques in Fe³⁺/Cu²⁺/H₂O₂ system. The resultshows the extent to which the four dye fade due to be oxided from big to small is Acid OrangeⅡ＞Neutral Red＞Fuchsin Basic＞Acid Orangeâ…¡. The author also changes theproportion of Fe³⁺,Cu²⁺ in total ions to study the complementariness of Fe³⁺,Cu²⁺ in thesystem and proves that the replacement of the single catalytic ions with the complicatedSystem Fe³⁺/Cu²⁺/H₂O₂ has a good ability of the ability of counter assault against thechanges of pH value. At the same time, the author studies the techniques of process of theSBR Fe³⁺/Cu²⁺/H₂O₂ and proves the feasability, economical efficiency and effectiveness.There are many factors limiting the discharge beyond the standard of landfill leachate.An important step is the advanced treatment of high COD_cr,high colour and high salinityof landfill leachate. The author carried out advanced treatment on the landfill leachatetreated by biological and chemical means from the Heimifeng garbage landfill field inChangsha. When examining the components of the sewage, the author found that whenthe system is on the condition that T=30～50℃, [H₂O₂]=0.12ml/L, [Fe³⁺]=0.2mmol/L,[Cu²⁺]=0.2mmol/L,t=60min, the CODcr of waste water falls from 500～700mg/L to 50～60mg/L, the colour falls from 100 fold to colourless, meeting the first level nationaldischarge standard. And the removal of sewage CODcr and the colour removal have somelinage relationship. UV/Fe³⁺/Cu²⁺/H₂O₂ system can treat the sewage difficult to dissolvewith complexed components, overcoming the disadvantages that Fenton and UV/Fentonhave a harsh demand on pH value and the catalyst is difficult to recycle. Therefore, themethod of landfill leachate by catalytic Oxidation with the UV/Fe³⁺/Cu²⁺/H₂O₂ system isfeasible.Lastly, the essay puts forward a basic theory of project design of treating the toxicorganic sewage difficult to dissolve with the Fe³⁺/Cu²⁺/H₂O₂ system based on analysis offactors affecting the expansion of the project, analyzes the techniques Of the project andits economic feasibility and points out that the SBR—UV/Fe³⁺/Cu²⁺/H₂O₂ system has alot of practical value and a good prospect for technical development to treat the toxicorganic sewage difficult to dissolve with a high density.