饮用水中内分泌干扰物双酚A的臭氧氧化降解研究

采用臭氧氧化工艺对饮用水中内分泌干扰物双酚A特性进行了研究.研究表明:在原水浓度为1.0mg/L左右,臭氧总投加量为1.0、1.5和2.0mg/L条件下,30min BPA去除率可达70%、82%和90%.通过考察不同臭氧投加量、不同本底条件、不同BPA初始浓度和不同臭氧投加时间对BPA臭氧氧化的影响,分析得出臭氧投加量对BPA的降解占主导地位,而臭氧接触时间对去除效果的影响很小;采用紫外波长扫描确定在臭氧降解BPA的同时生成了在UV₂₅₄上有吸收的产物.通过考察臭氧氧化双酚A过程中UV₂₅₄的变化,提出低臭氧投加量下BPA不能完全被氧化,而采用缩短臭氧投加时间、加大臭氧投加量以及提高水中余臭氧浓度等方法,有利于水中BPA的完全降解.

Degradation of Endocrine Disruptor Bisphenol A in Drinking Water by Ozone Oxidation

The ozone oxidation of endocrine disruptor(bisphenol A) in drinking water was investigated.With the initial concentration of 1.0mg/L,the removal efficiency of BPA(bisphenol A) could be measure up to 70%,82%,90% when the dosage of ozone was 1mg/L,1.5mg/L,2mg/L respectively within 30 minutes.The impacts of BPA degradation under the conditions of different ozone dosages,different water background value,different BPA initial concentration and different ozone adding time were analyzed.The results show that ozone dosage play a dominant role during the process of BPA degradation,while the impact of the contact time could be ignored.The UV wavelength scanning is used to conform that the by-products were produced,which can be absorbed at UV₂₅₄,and the UV₂₅₄ keeps changing with the ozonation process.From the change of UV₂₅₄,it can be drawn that BPA can not be completely degraded with low ozone dosage,while less adding time of total ozone dosage,high ozone dosage,improvement of dissolved ozone concentration will do great contribution to the extent of BPA degradation.