Yue Chan-Yuan, Miao Heng-Feng, Ren Hong-Yan, Ruan Wen-Quan
School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
Huan Jing Ke Xue. 2012 Apr;33(4):1227-33.
Kinetics on degradation efficiency of medroxyprogesterone (MPA) by ozonation was investigated in this paper. And the operating parameters such as MPA initial concentration, ozone dosage, pH and radicals scavenger (HCO3-) were further discussed. Results showed that MPA could be degraded effectively by ozonation, with a first-order kinetics in continuous ozone aeration system and a second-order kinetics in semibatch ozone aeration system, when the initial concentrations of MPA were 3, 5, 10 mg x L(-1). The increases of pH and the addition of HCO3- would bring negative effects to the degradation of MPA. The degradation efficiency of MPA decreased from 89.8% to 54.8% with pH increase from 3.10 to 9.02, and the rate constant k decreased from 0.1463 L x (mg x min)(-1) to 0.049 5 L x (mg x min)(-1) and the degradation efficiency decreased 22.2 percentage points with the addition of HCO3-, in semibatch aeration system.
本文研究了臭氧氧化法降解甲羟孕酮（MPA）的动力学。并进一步探讨了MPA初始浓度、臭氧投加量、pH值和自由基清除剂（HCO3-）等运行参数。结果表明，当MPA初始浓度为3、5、10 mg·L-1时，在连续臭氧曝气系统中MPA能被臭氧有效降解，降解符合一级动力学；在半间歇臭氧曝气系统中符合二级动力学。pH值的升高和HCO3-的加入会对MPA的降解产生负面影响。在半间歇曝气系统中，随着pH值从3.10升高到9.02，MPA的降解效率从89.8%降至54.8%，速率常数k从0.1463 L·(mg·min)-1降至0.0495 L·(mg·min)-1；加入HCO3-后，降解效率下降了22.2个百分点。
