Ultrasound/H₂O₂ System And Ultrasound/K₂S₂O₈ System Degradation Of Ciprofloxacin

The study focused on use of ultrasound/H₂O₂ system and ultrasound/K₂S₂O₈ system to decompose the quinolone antibiotic ciprofloxacin as the main research object.ciProfloxacin,by changing the concentration of oxidants,ultrasonic power,pH range and a series of variable factors to determine the best degradation conditions of the two degradation systems.Based on the best degradation conditions of the two degradation systems that have been determined,the COD removal rate,biodegradability,and mineralization levels were further analyzed.The results are as follows:In the experiment of ultrasound/H₂O₂ combined with ciprofloxacin degradation,the experimental results showed that when H₂O₂ was added at a concentration of 10mmol·L^-1、ultrasonic power was 180W and under the condition of neutral solution,the degradation effect of ciprofloxacin was the best,and the degradation rate was 67.9%.In addition,compared with ultrasound alone,H₂O₂ oxidation,ultrasound/H₂O₂combined with ciprofloxacin degradation has a significant synergistic effect,which is mainly related to the promotion of H₂O₂ decomposition to generate more?OH under ultrasound conditions.During the degradation of the ultrasound/H₂O₂ system,different initial concentrations of ciprofloxacin at concentrations below 20 mg·L^-1 were increase ultrasound power consumption,and at concentrations above 20 mg·L^-1,ultrasonic power 180W power consumption remained stable,ultrasonic power 270W power consumption increased with increasing concentrations,and the power consumption with concentration follow a positive correlation function of the law.In the experiment of degradation ciprofloxacin by ultrasound/K₂S₂O₈ system,according to the experimental results,when the concentration of K₂S₂O₈ is 15mmol·L^-1,ultrasound power 180W,ciprofloxacin solution in a neutral state,ultrasound/K₂S₂O₈ system degradation of ciprofloxacin were best,the degradation rate after 180min were 60.2%.Based on the previous experiments,the best conditions for the degradation of ciprofloxacin wastewater with ultrasound/H₂O₂ and ultrasound/K₂S₂O₈ systems were compared.ciprofloxacin removal rate,Chemical Oxygen Demand（COD）,Biochemical Oxygen Demand（BOD₅）,biodegradability,degree of mineralization,Total Organic Carbon（TOC）and other indicators.The results showed that the COD removal rates of ciprofloxacin after degradation for 180min were 58.31%and 54.4%respectively,the BOD₅/COD values were 0.33 and 0.31 respectively,and the TOC removal rates were 49.5%and 48.3%respectively.Indicate ultrasound/H₂O₂ system and ultrasound/K₂S₂O₈ system can not only effectively degrade the concentration of ciprofloxacin,but also increase the removal rate of COD,improve biodegradability and the degree of mineralization.