Experimental Study On Treatment Of Malachite Green Wastewater By UV-Enhanced Fe/Cu Catalytic Heterogeneous Fenton System

Dyeing wastewater has high chroma,high COD content,and is difficult to handle.The Fenton reagent method has a good treatment effect on difficult-to-treat industrial wastewater.However,the traditional Fenton reagent method has a narrow pH range during the reaction process,which is prone to produce iron-containing sludge.The amount of reagent is large and cannot be reused.Therefore,it is limited.Practical application in the field of water treatment.This experiment mainly studies the effect and process conditions of UV-enhanced Fe/Cu catalytic heterogeneous Fenton system for treating malachite green wastewater,and provides technical basis for the promotion and application in the field of printing and dyeing wastewater treatment.Taking malachite green wastewater as an object,a self-made photoreactor was used to experimentally study the effect and process conditions of UV-enhanced Fe/Cu catalytic heterogeneous Fenton system for treating malachite green wastewater.The research contents include:Preparation and characterization of Fe/AC and Fe-Cu/ATP-AC composite catalysts;Fe/AC catalytic heterogeneous Fenton system for treatment of malachite green wastewater;Fe-Cu/ATP-AC heterogeneous catalyst Experimental study on treatment of malachite green wastewater by Fenton system;experimental study on treatment of malachite green wastewater by UV-enhanced Fe/Cu catalytic heterogeneous Fenton system.Fe/AC heterogeneous catalysts and Fe-Cu/ATP-AC heterogeneous composite catalysts were prepared by impregnation method and impregnation-calcination method respectively.The optimal preparation conditions were:The optimal loading concentration of Fe²⁺in Fe/AC was 1mo L/L The optimal mass ratio of ATP to AC in Fe-Cu/ATP-AC is 2:1,and the optimal molar ratio of Fe to Cu is 2:1.Fe/AC catalytic heterogeneous Fenton system has a good effect in treating malachite green wastewater.When the initial pH is 3,the dosage of Fe/AC is 2g/L,the dosage of H₂O₂is 1.25Q_th,and the reaction temperature is 25?.At 120min,the chroma and COD removal rates were 92.01%and 78.95%,respectively.The experimental results of Fe-Cu/ATP-AC catalyzed heterogeneous Fenton system to treat malachite green wastewater show that the catalytic effect of Fe-Cu composite catalyst is better than that of single iron catalyst.When the initial pH is 4,the dosage of Fe-Cu/ATP-AC was 2g/L,and the dosage of H₂O₂was Q_th.The reaction time and chroma and COD removal rate of malachite green wastewater reached 94.64%and 83.28%,respectively,after 120minutes of reaction.The orthogonal test results show that the significant order of the effects of each single factor is:H₂O₂dosage>pH value>catalyst dosage>reaction time.UV enhanced the Fe-Cu/ATP-AC catalytic heterogeneous Fenton system for the treatment of malachite green wastewater.With a 20W UV light source for 90min,the chromaticity and COD removal rate were improved,reaching 98.37%and 87.07%;under the same conditions of removal rate,UV enhancement can reduce the reaction time from 120min to 90min,reduce the amount of catalyst from 2g/L to 1.5g/L,and reduce the amount of H₂O₂from 2.4m L/L to 1.8m L/L.Fe-Cu/ATP-AC catalytic heterogeneous Fenton system has ideal treatment effect for malachite green wastewater.The addition of Fe-Cu/ATP-AC heterogeneous catalyst improves the treatment effect,broadens the pH range,The catalyst can be reused.After UV strengthening,it not only further improves the treatment effect,but also effectively reduces the reaction time and the dosage of the agent.This method is of great significance for the treatment of printing and dyeing wastewater and reducing environmental pollution.