Study On The Treatment Of Typical PPCPs By Iron-copper Double Metal Micro Electrolytic And Derived Processes

With the improvement of detection technology in recent years,It is frequently reported that PPCPs are detected all over the world. Because of this kind of material possess the characteristic that is Environmental persistence,biological cumulative and high toxicity,the environmental behavior and risk of PPCPs have attracted more and more attention. The sulfamethoxazole(SMZ) and carbamazepine(CBZ) was chosen as the target pollutants to investigate the degradation efficiency of Iron-copper double metal micro electrolysis process and Fe/Cu-Fenton combined process. It is studied that the reason of the discrepancy of pollutants removal efficiency. According to the results of single factor experiment,Response Surface Methods(RSM) is used to analyze the removal efficiency of SMZ on Iron and copper double metal micro electrolysis,besides the different of Sequencing batch type beaker experiment and Long-term continuous reaction experiment has been researched. By studying the influence of the common ion in water environment on iron copper double metal micro electrolytic method deals with SMZ,the text analysis and discusses influence mechanism. On the basis of the result Iron copper plating micro electrolysis method deals with SMZ,the text characterizes the material and assesses treatment effect of SMZ. Based on the experimental data as well as the full text of the summary,we can get the following conclusions:(1)No matter how to change the experiment conditions,the removal rate of CBZ with Iron and copper double metal micro electrolytic method is about 10%,while the removal rate of SMZ can reach nearly 100% under the optimal conditions( pH=3 、 HRT=60min 、 Iron dosing quantity=60g/L and m(Cu):m(Fe)=4:1). Based on the analysis of Design Expert 8.0.6.1,the result has been found that the optimal conditions is pH=2.48 、 HRT=69.71 min 、 Iron dosing quantity=70.574g/L and m(Cu):m(Fe)=4.16:1 then the removal rate of SMZ can reach 100%. It was also found that SO42- had no significant effect on SMZ removal rate, and low concentration of Cl-、high concentration of NO3-、NO2- and NH4+ could improve the removal rate of SMZ. However the SMZ removal efficiency was inhibited by high concentration of Cl-、 low concentration of NO3-、PO4- and Ca2+.(2)Through the analysis of the SMZ and CBZ removal mechanism,SMZ removal mainly caused by the reduction of micro electrolysis process,but CBZ can not been be reduced. Adding hydrogen peroxide to the reaction,CBZ can been oxidized and the removal rate of CBZ is about 88.2%. Besides The reduction product of SMZ can been oxidation removal too.Under the optimal reaction conditions,continuous reaction can stable operation of about 18 days. Then as the decreased iron content in the water,goal pollutant removal rate begin to fall. The text try to make the iron content in the water Maintain the normal level with Fe2+ and iron scraps supplement. It can been found that the supplement of Fe2+ can improve the removal rate of CBZ and the removal rate of SMZ has no change,while the supplement of iron scraps can improve the removal rate of SMZ and CBZ soon.(4)Copper iron surface adhesion degree is one of the important factors for Iron copper plating micro electrolysis method deals with SMZ,no matter the Cu content is too much or little,pollutants removal efficiency all will be affected. When Iron and copper ion ratio is 6:0.04,temperature is about 30 oC and the rotate speed of constant temperature shaking table is 100 r/min,the removal rate of SMZ is the best.