Experimental Study On Treatment Of Dye Wastewater By Ultraviolet PHotocatalytic Three-Dimensional Electrode Electro-Fenton Method

In recent years,with the rapid development of dye technology,arious biologically refractory organic dye wastewaters have increased accordingly,the traditional sewage treatment technology is difficult to deal with the standard.Ultraviolet photocatalytic three-dimensional electrode electro-Fenton method is a new electrochemical water treatment technology,It combines the advantages of electrochemistry and Fenton technology,It also allows virtually no selective degradation of pollutants in wastewater.Therefore,it has received extensive attention.In this study,a self-made electrochemical reactor was used to treat reactive brilliant blue X-BR dye wastewater.The main research contents include:Experimental Study on Treatment of Reactive Brilliant Blue X-BR Dye Wastewater by Photocatalysis;Experimental study on the treatment of reactive brilliant blue X-BR dye wastewater by external photocatalytic three-dimensional electrode electro-Fenton method and response surface method to optimize reaction parameters;Comparative study on the degradation effect and energy consumption of ultraviolet three-dimensional electrode electro-Fenton method and ordinary three-dimensional electrode electro-Fenton method and the degradation kinetics of ultraviolet three-dimensional electrode electro-Fenton method.In photocatalytic experiments,by single factor test,studying influence of initial concentration,light source and power size,p H,time,catalyst concentration and other parameters.Control reaction conditions:the initial concentration is 50 mg/L,15W 254nm UV light,p H=4.0,the amount of Ti O₂added is 0.5 g/L,the reaction time is 60min.As this time,the decolorization rate reached 75.46%,the COD reached 53.27%.Degradation of reactive dyes X-BR by UV light can be described by first-order kinetics,The kinetic equation is:ln（C₀/C_t）=0.0405t-0.0015.In the experiment of UV photocatalytic three-dimensional electrode electro-Fenton method,by single factor test,choosing the 15W,254nm UV light source,investigating parameters such as reaction time,voltage,p H value,catalyst dosage,aeration amount,plate-to-electrode spacing,electrolyte type and concentration to conduct experimental research on reactive brilliant blue X-BR dye wastewater.The effect of voltage,aeration rate and p H value on the reaction was determined by response surface optimization experiment,the order of the degree of influence on the decolorization rate is:p H>aeration volume>voltage;the order of the degree of affecting the COD removal rate is:p H>voltage>aeration amount;Considering the decolorization rate and COD removal rate of dye wastewater comprehensively,the optimal reaction parameters are:voltage 20.16V,aeration rate0.61L/min,p H value 3.22,at this time,the decolorization rate was 96.59%,and the COD removal rate was 82.23%.In the comparative test of photocatalytic three-dimensional electrode electro-Fenton method and three-dimensional electrode electro-Fenton method for the treatment of reactive brilliant blue X-BR dye wastewater.in terms of decolorization rate and COD removal rate,compared with the three-dimensional electrode electro-Fenton method,the p Hotocatalytic three-dimensional electrode electro-Fenton method has increased the decolorization rate by15.98 and 19.56%,respectively.Both in terms of system energy consumption,the former is more energy efficient than the latter,When the decolorization rate is 90%,the energy consumption of the p Hotocatalytic three-dimensional electrode electro-Fenton oxidation system is only 34%of the energy consumption of the three-dimensional electrode electro-Fenton oxidation system.The degradation process of reactive brilliant blue X-BR in p Hotocatalytic three-dimensional electrode electro-Fenton oxidation can be described by first-order kinetics,The kinetic equation is（?）.In summary,photocatalytic three-dimensional electrode electro-Fenton method has the best effect on the treatment of reactive brilliant blue X-BR dye wastewater,it’s easy to operate and simple to run.And compared with the normal three-dimensional electrode electro-Fenton method,it is more energy efficient,Suggest further research and improvement to apply in practical engineering.