The Study Of New Technology In Degradation Of Organic Wastewater By Using Photoelectro-Fennton Catalysis

Coking wastewater and pigment wastewater were used as delegates of organic wastewater,which were degraded by the combination treatment of electrochemical?photoelectric,Fenton technology and three dimensional electrode method.The efficiency of electro catalytic oxidation and of the utilization of light was improved by optimization of catalyst comosition and experimental parameters.The following results were obtained from the study.1?Fe/Ni/AC electrode was prepared by co precipitation method using activated carbon as the carrier which was treated with nitric acid.This electrode was used as an anode for electrocatalytic oxidation of coking wastewater,and then the effect of treatment of activated carbon,Fe/Ni ratio,calcination temperature and calcination time on the effectiveness of oxidation degradation of coking wastewater by the anode was explored.SEM,EDS,and BET were used to characterize the electrode.It was found that the activated carbon treated by nitric acid with greater surface area could load more catalytic materials;and Fe/Ni/AC electrode has better degradation performance than AC and Fe/AC anode.Under the optimal preparation conditions of the electrodes,namely Fe/Ni ratio 4:1,roasting temperature 300 degree celsius,roasting time 4h,and reaction time 100min,the COD removal rate of coking waste water could reach 91.25%.2.TiO2/AC precursor obtained by sol-gel method was used to prepare CuO/TiO2/AC electrode by precipitation method.With CuO/TiO2/AC working as the third electrode,photoelectric Fenton method was used for degradation of methyl orange solution.The optimum experimental conditions for the degradation of methyl orange simulated wastewater was explored as:electrode particle dosage 7g/L,initial pH value 5,current intensity 400mA,electrolyte concentration 2mol/L.Under this condition,the organics removal rate of methyl orange solution could reach 96.4%.SEM,EDX and XRD were used to characterize the electrode.It was found that TiO2 and CuO had been loaded on AC surface,and TiO2 was anatase type structure.The methyl orange solution was detected by ultraviolet visible spectrum before and after degradation,and the result showed that the azo group in methyl orange had been opened and then was degraded into small molecules.3?According to the characteristics of coking wastewater and pigment wastewater,the equipment for pilot test was designed and was tested in the factory.After a perod of pilot test,we found that the technology could acquire excellent performance on the removal of these two kinds of wastewater.The effluent quality reached the discharge standard,and the operation cost was low.But also we found the disadvantages of this technology.The anode basket could be easily blocked by the precipitated organic pollutant after degradation,and then the anode efficiency was decreased.So the main research direction in the future for this technology is to resolve the phenomenon of electrode clogging as much as possible and in engineering design,which is the key for keeping high degradation efficiency.