School of Resources and Environment, University of Jinan, Jinan 250022, China.
Ultrason Sonochem. 2010 Apr;17(4):680-4. doi: 10.1016/j.ultsonch.2010.01.004. Epub 2010 Jan 14.
Sonochemical degradation of levofloxacin was investigated to assess the operational parameters and the impacts of rate enhancers (CCl(4)) and rate inhibitors (t-butanol). Different dosages of CCl(4), pH value of solutions, ultrasonic power, and initial concentration of levofloxacin which affected the degradation of levofloxacin were studied. The degradation rate of levofloxacin was accelerated with increased concentrations of CCl(4) via the accumulation of reactive chlorine species and the hindrance of ()OH radical combination reactions with atomic hydrogen. The addition of t-butanol at all test concentrations inhibited the degradation of levofloxacin regardless of the quantity of ()OH radicals in solution. It was also found that 5-day biochemical oxygen demand (BOD(5)) of the solution increased evidently after sonochemical treatment, and the ratio of BOD(5)/COD that was a good measure for biodegradability increased from 0 to 0.41, which indicated that biodegradability of the solution was obviously enhanced. Based on the results, it is feasible that sonochemical oxidation can be used for pretreatment of levofloxacin effluent before biological treatment processes.
超声化学降解左氧氟沙星的研究，以评估操作参数和速率增强剂（四氯化碳）和速率抑制剂（叔丁醇）的影响。不同剂量的四氯化碳，溶液的 pH 值，超声功率，和初始浓度的左氧氟沙星影响左氧氟沙星的降解进行了研究。通过积累活性氯物种和（）OH 自由基与原子氢的结合反应的阻碍，左氧氟沙星的降解速率随着四氯化碳浓度的增加而加速。叔丁醇的添加在所有测试浓度下都抑制了左氧氟沙星的降解，而不管溶液中（）OH 自由基的数量如何。还发现，超声化学处理后溶液的五日生化需氧量（BOD（5））明显增加，生物降解性的良好衡量标准 BOD（5）/COD 的比值从 0 增加到 0.41，这表明溶液的生物降解性明显增强。基于这些结果，超声化学氧化可用于生物处理工艺前的左氧氟沙星废水的预处理。
