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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.
The prolactin medroxyprogesterone acetate (MPA) in drinking water was used as the target substance to degrade it by ozone oxidation process. The kinetics of ozone degradation process was studied. The effects of liquid phase ozone concentration, pH, hydroxyl group The effect of free radical (.OH) scavenger (HCO3-) on the degradation process was studied. The results showed that ozone could effectively degrade MPA in aqueous solution under the proper conditions. The initial concentration of MPA was 3,5,10 mg.L-1. In the continuous ozone aeration process, the degradation process obeys the first-order reaction kinetics model. When using sequential batch ozone injection, the degradation process accords with the second-order reaction kinetics model. The increase of pH and the addition of HCO3- The results showed that the removal rate of MPA decreased from 89.8% at pH = 3.10 to 74.6% at pH = 9.02 at the reaction temperature of 20 ℃ .At the same reaction conditions, With the addition of hydroxyl radical scavenger HCO3-, the degradation rate constant decreased from 0.146 3 L. (mg.min) -1 to 0.049 5 L. (mg.min) -1, and the removal rate decreased by 22.2%.