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0.146 3 L.(mg.min)-1下降到0.049 5 L.(mg.min)-1,去除率下降了22.2个百分点.
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（HCO-3） 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 HCO-3 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 0.146 3 L·（mg·min）-1 to 0.049 5 L·（mg·min）-1 and the degradation efficiency decreased 22.2 percentage points with the addition of HCO-3,in semibatch aeration system.
出处
《环境科学》
CAS
CSCD
北大核心
2012年第4期1227-1233,共7页
Environmental Science
基金
教育部高等学校科技创新工程重大项目培育基金项目(708048)
关键词
甲羟孕酮
臭氧氧化
动力学
降解速率
去除率
medroxyprogesterone
ozone oxidation
kinetics
degradation rate
degradation efficiency
