饮用水厂排泥水及污泥中全氟化合物分布特征  

Distribution characteristics of perfluorinated compounds in sludge wastewater and sludge from drinking water treamtment plant

作　　者：孙敏[1] 鲍俊信 徐蓓 周浩[1] SUN Min;BAO Jun-xin;XU Bei;ZHOU Hao(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室环境学院,江苏南京210098

出　　处：《浙江大学学报（工学版）》2019年第9期1835-1842,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家重点研发计划资助项目(2016YFC0400803);中央高校基本科研业务费专项资金资助项目(2018B453).

摘　　要：针对饮用水中全氟化合物(PFCs)存在的潜在水质安全风险,为饮用水厂控制PFCs提供数据支持,探究长江南京段原水和饮用水厂常规处理工艺过程水、排泥水中5种PFCs的质量浓度和污泥中5种PFCs的质量分数分布特征,分析PFCs在絮凝沉淀、过滤工艺中的物料平衡,排泥水和污泥间的PFCs分配规律及阳离子交换量对污泥中PFCs分布影响.结果表明:饮用水厂的原水、过程水和排泥水中全氟辛酸(PFOA)和全氟辛烷磺酸(PFOS)的质量浓度最高,污泥中质量分数最高的为全氟壬酸(PFNA)、全氟癸酸(PFDA)和PFOS.全氟丁酸(PFBA)、PFOA、PFNA和PFDA的泥-水分配系数与有机碳质量分数正相关,官能团是影响PFOS在泥-水间的分配规律的因素之一.对于絮凝池和沉淀池前段污泥,粒径越大,PFCs质量分数越高;对于沉淀池中、后段和V型滤池污泥,粒径越小,PFCs质量分数越高;PFCs的质量分数与污泥中阳离子交换量(CEC)显著正相关.The distribution characteristics of five perfluorinated compounds(PFCs)in Yangtze River raw water,process water,sludge wastewater and sludge in drinking water treatment plant(DWTP)were quantified,in view of the potential water quality safety risks of PFCs in drinking water,and to provide data support for DWTP controlled PFCs.Material balance of PFCs in flocculation,settling and filtration process was analyzed;the PFCs distribution between the sludge wastewater and sludge and the impact of cation exchange capacity(CEC)on PFCs distribution were analyzed.Results show that perfluorooctanoic acid(PFOA)and perfluorooctane sulfonate(PFOS)are mainly distributed in raw water,process water and sludge wastewater in DWTP,while in sludge perfluoronnonanoic acid(PFNA),perfluorodecanoic acid(PFDA)and PFOS are the main PFC contaminant.The sludge-water partition coefficient is positively correlated with the organic carbon fraction for perfluorabutyric acid(PFBA),PFOA,PFNA and PFDA;and the functional group is one of the factors affecting the distribution of PFOS.The PFCs mass fraction is higher in large size fractions from the flocculation tank and front of settling tank,while it is lower in large size fractions from the middle and rear sections of the settling tank and V-filter.A significantly positive correlation between PFCs mass fraction and CEC in sludge is observed.

关 键 词：饮用水厂(DWTP) 全氟化合物(PFCs) 排泥水 污泥 物料平衡 泥-水分配系数 

分 类 号：TU991[建筑科学—市政工程]