Experimental Study On Treatment Of Azo Dye Wastewater By Loaded Three-dimensional Electrode Electric Fenton Method

Three-dimensional electrode electrocatalysis technology on the basis of electro-Fenton,In the treatment of refractory wastewater,a large number of pollutants can be removed from the water when treating a variety of wastewaters.The preparation of three-dimensional particle electrodes with excellent performance is the key to improving the removal effect,which has attracted much attention in recent years.The subject studies the effect and influencing factors of the treatment of reactive brilliant orange X-GN azo dye wastewater by the supported three-dimensional electrode-electric Fenton method.Provide technical basis for popularizing the application of this method.The experiment took the active bright orange X-GN wastewater as the treatment object,and through a small test in the laboratory,the effect of the loaded three-dimensional electrode electric Fenton method in the treatment of the active bright orange X-GN wastewater was studied.The research content includes the selection of combination of plate materials and the preparation of three-dimensional particle electrodes.Influence of main single factors on the treatment effect of reactive bright orange X-GN wastewater treatment system,optimization of process parameters by response surface method.Influence of inorganic ions on treatment effect,analysis of reaction kinetics of reaction system.The test results of electrode plate material selection show that after the reaction time reaches 120min,the effect of stainless steel/stainless steel system in treating wastewater is better than that of graphite/stainless steel system and graphite/graphite system.Three three-dimensional particle electrodes loaded with different metal oxides were prepared experimentally.The comparative test results of treating reactive bright orange X-GN wastewater show that,loaded with Mn oxide is better than the other two supported 3D electrodes.When the reaction time is 120min and the dosed mass of the electrode dosage is30g,the removal rates of COD and chroma were 81.19%and 88.73%.The single factor effect test showed that,reaction time,p H value,reaction electrolysis voltage,electrode spacing,dosage of three-dimensional particle electrode,dosage of Fe²⁺,electrolyte concentration,and aeration intensity will affect the load-type this method for the treatment of water sample effects has an impact.Determination of optimal process conditions by response surface method.The test results show:for COD of 648mg/L,chromaticity is 600times of water sample,when the reaction time is 90min,p H=4.7,the power supply voltage is20.39V,the dosage of Na₂SO₄ is 2.13g/L,the dosage of the three-dimensional particle electrode is 30g/L,the interval between the electrodes is fixed at 8cm,and the dosage of Fe²⁺is 2.5mmol/L,when the aeration rate is 5L/min,the COD and chromaticity removal rates can reach 85.41%and 92.18%.The inorganic ion test results show that,S^2-and CO₃^2-will continue to consume the oxidized groups produced in the test,which will affect the progress of the Fenton reaction,and affect the color and COD removal rate;Both Cl^-and H₂PO₄^-react with iron ions to form complexes,which inhibit the main reaction;NO₃^-has basically no effect on the reaction.The results show that the method conforms to first-order reaction kinetics.Loaded three-dimensional electrode-electro-Fenton method can effectively treat reactive brilliant orange X-GN azo dye wastewater.The three-dimensional particle electrode loaded with Mn oxide improves the electrocatalytic performance,improves the treatment effect,and has a small probability of secondary pollution.The method has a good application prospect in the field of refractory biodegradable wastewater treatment.