Study On Degradation Of Azo Dye Wastewater By Three-dimensional Electrode

Azo dyes are widely used in the printing and dyeing processes of textiles,cotton,linen,fibers and other materials because of their fast synthesis and easy coloring.The discharged wastewater has the characteristics of complex components and large chroma,which is a typical difficult organism Degradation wastewater.The traditional biological method has low treatment efficiency and unsatisfactory effect on azo dye wastewater,and cannot meet the requirements of the environment for the discharged sewage.Electrocatalytic oxidation technology,as a green and advanced oxidation technology,has the advantages of wide adaptability,good treatment effect,easy control,no pollution,and convenient operation and management.In this experiment,Sn O₂/Ti was used as the anode,stainless steel was used as the cathode,and activated carbon was used as the particle electrode.The self-made rectangular plexiglass three-dimensional electrode reactor was used to degrade the active brilliant red X-3B simulated azo dye wastewater.The influencing factors of three-dimensional electrode treatment of Reactive Brilliant Red X-3B were investigated,and the particle electrode was modified by dipping method.The effects of modification conditions on the degradation effect of Reactive Brilliant Red X-3B were investigated;the stability and regeneration performance of the particle electrode prepared under the optimal modification conditions were studied.Determining the leading factors of the treatment effect of the three-dimensional electrode reactor,comparing the degradation effect and energy consumption before and after modification,and analyzing the degradation kinetics of the modified particle electrode.The experimental results show that when the concentration of active brilliant red X-3B is100mg·L-1,the electrolytic voltage is 8V,the distance between the electrode plates is 6cm,the amount of electrolyte added is 2g,the amount of aeration is 30L/H,and the amount of particle electrodes is 60g,the Red X-3B has a dye removal rate of 80.68%and a COD removal rate of 55.39%.Acid-base modification will affect the content of acidic oxygen-containing functional groups on the surface of activated carbon.The immersion time is 12h,the concentration of the immersion solution is 0.1mol/L,the baking temperature is400?,and the baking time is 4h.The surface morphology of the particle electrode varies greatly under different modification conditions.After the particle electrode has been run for 8times,the degradation effect of Reactive Brilliant Red X-3B tends to be stable,the dye removal rate is about 80.36%,and the COD removal rate is 57.81%.The dye removal rate and COD removal rate of Reactive Brilliant Red X-3B using the particle electrode regenerated by electrochemical methods were restored to 85.97%and 65.51%,respectively.In the orthogonal test of Ni/AC degradation of active brilliant red X-3B,the order of primary and secondary effects on the removal rate of active brilliant red X-3B and COD remained the same;electrolytic voltage 8V,p H value 5,electrolyte dosage 2g The optimal degradation condition is when the particle electrode dosage is 60g.The removal rate of Ni/AC degradation active brilliant red X-3B and the removal rate of COD were 85.97%and65.51%,respectively.Compared with AC,the dye removal rate increased by 5.29%,the removal rate of COD increased by 10.12%,and the energy consumption was reduced.13%.The process of Ni/AC degradation of active brilliant red X-3B simulated azo dye wastewater conforms to the first-order reaction kinetics,the equation is ln?C₀/C_t?=0.0319t+0.1116,(the rate constant is 0.0319min^-1,and the linear correlation coefficient Is R²=0.9771);The COD degradation process conforms to the first-order reaction kinetics,the equation is ln?C₀/C_t?=0.0404t-0.3731,(the rate constant is 0.0404min^-1,and the linear correlation coefficient is R²=0.9706).