Preparation Of MnO₂-Ru O₂/CFS Composite Electrode And Performance Study For Treating Organic Wastewater Containing High Concentration Of Chloride

Organic wastewater containing high concentration of chloride has gradually become one of the important problems in the field of industrial water treatment due to its large water volume,wide sources,and difficult biochemical treatment.Electrochemical oxidation treatment method has become an important process to treat organic wastewater containing high concentration because it can promote chloride ions to produce strong oxidizing substances and degrade organic pollutants.This paper used an electrochemical deposition method to load active materials on the surface of carbon fiber cloth to prepare anode electrode,and formed an electrochemical oxidation reaction system with cathode electrode.Physical properties of electrode and electrochemical performance were analysised by characterization methods and treatment of simulated methylene blue dye wastewater,and treatment of simulated N-N dimethylformamide（DMF）refractory organic wastewater was studied to investigate the effects of various factors on the experimental reaction,experimental conditions were optimized by using orthogonal design method,and explored the mechanism and pathways of DMF degradation;in order to analyze the practicality of electrodes.an experimental study about cephalosporin synthetic pharmaceutical wastewater containing high concentration of chloride were carried out on the basis of simulated wastewater experimental conditions.The main research contents and conclusions are as follows:（1）Compared with the preparation of RuO₂/CFS electrode,dense and rough MnO₂and RuO₂nanocrystals was distributed on the surface of MnO₂-RuO₂/CFS composite electrode.it can improve the utilization of chloride ions and enhance the electrochemical performance,its decolorization rate and COD removal rate in electrochemical oxidation treatment of simulated methylene blue dye reach as high as 97.6%and 95.2%,respectively.（2）In order to treat simulated DMF wastewater by electrochemical oxidation,an electrochemical reaction system was formed by using carbon fiber cloth as cathode and MnO₂-RuO₂/CFS composite electrode as anode.The experimental results show that the DMF removal rate can reach more than 90%under the optimum reaction conditions of current density of 90 m A·cm^-2,spacing between two electrode plates of 15 mm,electrolyte concentration of 7500 mg·L^-1and initial concentration of DMF of 2000 mg·L^-1,after 90 minutes of reaction.The active chlorine was produced by the electrochemical reaction system can effectively destroy the molecular structure of DMF.（3）In order to treat cephalosporin synthetic pharmaceutical wastewater containing high concentration of chloride by the electrochemical reaction system.The experimental results show that under the optimum reaction conditions of current density 100 m A·cm^-2,distance between two electrode plates 25 mm,initial concentration of 2000 mg·L^-1and no additional electrolyte.COD concentration can be reduced by 52%and nitrogen oxides had a high conversion rate.