【摘要】 为研究全氟化合物在污水厂中的去除效率和环境行为,对泰安市2座污水处理厂进出水中不同链长的全氟磺酸和全氟羧酸的存在与分布进行了采样调查,并分析了全氟辛烷磺酸(PFOS)和全氟辛烷羧酸(PFOA)在采用曝气-A2O工艺的污水处理厂各单位中的浓度变化情况.研究发现,上述污水厂进出水中全氟化合物的污染程度较轻,其中,PFOA、PFOS和全氟癸烷羧酸(PFDA)是代表性污染物.曝气工艺对于污水中全氟化合物的去除具有一定作用,而厌氧/好氧过程对于全氟化合物的去除作用均不明显,回流污泥可能使部分全氟化合物在厌氧池内再次释放到水相中.紫外消毒过程后水中PFOA和PFOS的浓度均有所提高,这可能是光氧化过程导致了污水中前体物质向全氟化合物的转化.更多还原

【Abstract】 To study the removal efficiency and environmental behavior of perfluorinated compounds in wastewater treatment plants(WWTPs),the existence and distribution of perfluorinated sulfonic acids and perfluorinated acids in the influent and effluent of two WWTPs in a city of Northern China were investigated.Moreover,changes of PFOS and PFOA concentration in different treatment units of a WWTP,which employs an aeration-A2O treatment method,were also analyzed.A relatively low degree of perfluorinated compound pollution was found,with PFOA,PFOS and PFDA being the dominant components.The aeration process could contribute to the elimination of perfluorinated compounds,while little elimination effect occurred in anaerobic or aerobic tanks.Returned sludge might release part of perfluorinated compounds back into the water phase in the aerobic tank.Concentrations of PFOS and PFOA increased after a UV disinfection process,which indicated a potential transformation from the precursors into perfluorinated compounds induced by photo-oxidation reactions.更多还原