【摘要】 通过考察长江原水和南方某净水厂各单元处理工艺中5种全氟化合物（PFCs）的分布特征,分析了各单元对PFCs的去除效果,并探讨了UV/SO₃^2-光还原技术降解饮用水中PFCs的机理。长江原水经过净水厂处理后,总PFCs去除率为35.33%,其中混凝沉淀工艺对PFCs的去除率最高,臭氧和氯消毒工艺会造成PFCs的增加;采用波长为365 nm、功率为500 W的紫外灯激发SO₃^2-产生的水合电子能够降解水中的PFCs。当PFCs初始浓度为1 mg/L、SO₃^2-浓度为0.4 g/L、p H值为8.5时,5种PFCs的降解均符合一级反应动力学;PFDA降解的中间产物表明UV/SO₃^2-技术是通过逐步脱去CF2实现降解的。更多还原

【Abstract】 The distribution characteristics of five perfluorinated compounds（ PFCs） in Yangtze River raw water and treatment processes of a water supply plant were analyzed. The results showed that the removal efficiency of PFCs in the water plant was limited with the removal rate of 35. 33%. The coagulation unit was the most efficient in removing PFCs. PFCs concentration increased after ozonation and disinfection. In order to effectively remove the PFCs,UV/SO₃^2- reductive degradation process was proposed,and its photodegradation mechanism was investigated. SO₃^2- could produce hydrated electron under 365 nm and 500 W UV irradiation,which contributed to the removal of PFCs. When the initial concentration of PFCs was 1 mg/L,concentration of SO₃^2- was 0. 4 g/L,p H was 8. 5,the degradation of five PFCs was in accordance with first-order reaction kinetics. The degradation products of PFDA indicated that degradation of PFCs were achieved by gradual removal of CF₂ in this system.更多还原