Oxidation Degradation On The Typical Antibiotics In Second Effluent By UV/Fenton

In recent years,the residues of drugs in water environment have attracted extensive attention.Although the content of antibiotics in environmental water is ?g/L,or even ng/L,it can inhibit or kill non drug-resistant bacteria,and drug-resistant dominant organisms grow and reproduce,and break the illusion of ecological balance.A large number of studies shows that the tail water discharge of sewage treatment plants is the main route of antibiotics.Therefore,it is of great practical significance to deal with the residual antibiotics in effluent from two sewage treatment plants.In this experiment,UV/Fenton was used for advanced treatment of sewage plant effluent of typical antibiotics?sulfadiazine,sulfamerazine and sulfamethazine,sulfamethoxazole,fleroxacin,lomefloxacin,enoxacin,pefloxacin,norfloxacin?for removal of the target,using the response surface method?Design-Expert 8.05b?UV/Fenton process parameters optimization study,Fenton(H₂O₂/Fe²⁺=10:1),UV,pH of the solution,reaction time and the removal effect of typical antibiotics,establish the mathematical model for UV/Fenton process,the optimum operating conditions.The results show that the UV/Fenton oxidation decomposition effluent residual antibiotics,a response model by using Design-Expert software,analysis of variance,P value of<0.0001 model,the correlation coefficient R2 is 0.9748,the adjustment of the correlation coefficient Radj2 is 0.9496,the surface shows that the regression equation is better to simulate the real.The response surface model is established between the removal efficiency and impact factors of a significant relationship between the order of Fenton > pH> reaction time >UV;c?H₂O₂?=24.44mmol/L,c(Fe²⁺)=2.44mol/L,pH3.61,reaction time 56.06 min,the work of the 2.06 ultraviolet lamp irradiation intensity,predict the best treatment effect can be achieved 80.06%.Verify the best experimental conditions,sulfonamides removal rate was 85.97%,the treatment effect of sulfamethoxazole best can reach 91.20%,while quinolones removal rate was only 66.75%,the degradation rate of Lomefloxacin was 54.91%,the total removal rate of 9 kinds of Typical Antibiotics 76.52%,close to the predicted value of 80.06%,the relative deviation of 4.4%.According to the order of significant relationship among the factors,the removal efficiency and mechanism analysis of singlefactor on target material were investigated under the condition of optimal response.The results of c?H₂O₂?=28mmol/L,c(Fe²⁺)=2.44mol/L,pH3.61,the work of the 3ultraviolet lamp irradiation intensity,when the hydraulic retention 56 min,city sewage treatment plant two effluent residual antibiotic removal rate can reach 86.89%.