Study On The Treatment Of Printing And Dying Wastewater By Electro-Fenton Reagent

Because of its large displacement,complex and changes in water quality,high color degree,and multi-carcinogenic,the printing and dying wastewater is recognized one of the most difficult bio-degradation industrial wastewater at home and abroad.At present,a single process such as physical,chemical and so on have been very difficult to achieve the emission standards.In order to achieve effective on the degradation of printing and dyeing wastewater,advanced oxidation technology to produce hydroxyl radical comes into being,which the Electro-Fenton method has been given more concern,for its broad application prospect.This paper focused on the electrolysis treatment of printing and dying wastewater by the method of Electro-Fenton,studied the main factors and optimized the parameters to find the best conditions.During the process of degradation,introduction of ultra-violet light is to explore the impact on the accelerating pollutants degradation efficiency by the Fe³⁺ complex Photolysis as well as the Electro-Fenton reaction to enhance Fe²⁺ regeneration.The experimentation selected the activated carbon fiber with good conductive properties as the cathode material,discussing the experimental law of wastewater degradation.The main research contents are as follows:(1) Conclusion that the relationship of primary and secondary factors in electrolyzing acid red solution by orthogonal test is pH> Electrolyte concentration> Electric current> Electrode spacing;optimal combinations of the parameters is as follows: pH is 2.5,current intensity is 0.6 A,electrolyte concentration is 8g/l,electrode spacing is 8 cm.(2) That the introduction of UV-coordinated Electro-Fenton can speed up the velocity of the reaction,improve the degradation efficiency,the color degree and COD removal rates of acid red solution respectively reached 99%and 79%. Compared with ordinary method,the reaction time shortened 30 to 60.(3) Decolorization and degradation of acid red solution is in line with the first order reaction kinetics,the formula is ln(Co/Ct)=0.0415t-0.0119.(4) Analysis of single-factor test,activated carbon fiber as the cathode material to deal with reactive dye waste water,electrolytic decoloration rate of one hour achieved more than 80%to reach a good effect in a relatively short time.Because of its high Specific surface area and a good conductivity,enhance the oxidation of organic molecules,and promote rapid and complete degradation of dyes.Conclusion that the relationship of primary and secondary factors by orthogonal test is pH> Electrolyte concentration> Electric current> Electrode spacing;optimal combinations of the parameters in electrolyzing Actived Orange is as follows:pH is 2.5,current intensity is 0.8 A,electrolyte concentration is 12g/l,electrode spacing is 9 cm;and Actived Blue is as follows:pH is 2.5,current intensity is 0.8 A, electrolyte concentration is 8g/l,electrode spacing is 10 cm.(5) Decolorization and degradation of Actived Blue solution is in line with the first order reaction kinetics,the formula is ln(Co/Ct)=0.033t-0.0536,while Actived Orange conformed to logarithmic relationship,formula is ln(Ao/At)=0.0282t+3.7589.