| 饮用水中甲羟孕酮的臭氧氧化降解研究 |
| 摘要点击 2713 全文点击 1305 投稿时间：2011-06-09 修订日期：2011-08-22 |
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| 中文关键词 甲羟孕酮 臭氧氧化 动力学 降解速率 去除率 |
| 英文关键词 medroxyprogesterone ozone oxidation kinetics degradation rate degradation efficiency |
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| 中文摘要 |
| 以饮用水中内分泌干扰物孕激素类甲羟孕酮 (MPA)为目标物,采用臭氧氧化工艺对其进行降解,对臭氧降解过程动力学进行了研究,并考察液相臭氧浓度、pH、羟基自由基(·OH)清除剂(HCO3-)对降解过程的影响.结果表明,臭氧在合适条件下能够有效降解水溶液中的MPA,MPA初始浓度为3、5、10 mg·L-1,采用连续臭氧曝气方式降解时,降解过程遵守一级反应动力学模型; 采用序批式臭氧投加方式进行降解时,降解过程符合二级反应动力学模型.pH的升高和HCO3-的添加都会对降解效果产生负面影响.在反应温度为20℃,采用序批式臭氧投加方式,MPA的去除率从pH=3.10时的89.8%下降到pH=9.02时的74.6%.相同反应条件下,添加羟基自由基清除剂HCO3-后,降解反应速率常数由0.1463 L·(mg·min)-1下降到0.0495 L·(mg·min)-1,去除率下降了22.2个百分点. |
| 英文摘要 |
| 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·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·(mg·min)-1 to 0.0495 L·(mg·min)-1 and the degradation efficiency decreased 22.2 percentage points with the addition of HCO3-, in semibatch aeration system. |
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