净水厂沉淀池污泥中PFCs分布及吸附/解吸规律研究
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摘要
探究了长江南京段某净水厂平流式沉淀池过程水、排泥水和不同分段污泥中全氟辛酸(PFOA)和全氟辛烷磺酸(PFOS)两种全氟化合物(PFCs)的浓度分布,研究了沉淀池污泥对低浓度PFCs(200 ng·L~(-1))的吸附/解吸规律。结果表明:沉淀池排泥水和过程水中PFOA和PFOS的质量浓度分别为48.35～63.38和56.26～71.62ng·L~(-1),中段污泥中PFOA和PFOS的干重浓度分别为1.03和1.54ng·g~(-1)·dw(干重),均高于前段和中段污泥。PFOA和PFOS在污泥中的吸附和解吸分别在24和36 h能达到平衡,两种PFCs均存在不同程度的解吸滞后现象,PFOA在污泥中基本为可逆吸附,约30%的PFOS不可逆吸附于污泥中。PFOA的吸附容量低于PFOS,PFOA的解吸率高于PFOS。
The levels of perfluorooctanoate(PFOA) and perfluorooctane sulfonate(PFOS) in process water, sludge wastewater and sludge from horizontal sedimentation tank of a water supply plant were quantified. The adsorption and desorption of PFCs of low concentration(200 ng·L~(-1)) on sludge from sedimentation tank were studied. The results showed that the mass concentrations of PFOA and PFOS in sludge wastewater and process water were 48.35～63.38 and 56.26～71.62 ng·L~(-1),respectively. Simultaneously,PFOA and PFOS concentrations in sludge from the middle sedimentation tank were 1.03, 1.54 ng·g~(-1)·dw(dry weight),respectively. And both of them were higher than that of sludge from the front and rear sections of sedimentation tank. The adsorption and desorption of PFCs on sludge reached equilibrium at 24 h and 36 h, respectively, while desorption hysteresis was observed during the desorption process. PFOA was basically reversible adsorbed on sludge, and about 30% of PFOS was irreversibly adsorbed on sludge. The adsorption capacity of PFOA was lower than that of PFOS, while the desorption rate of PFOA was higher than that of PFOS.
The levels of perfluorooctanoate(PFOA) and perfluorooctane sulfonate(PFOS) in process water, sludge wastewater and sludge from horizontal sedimentation tank of a water supply plant were quantified. The adsorption and desorption of PFCs of low concentration(200 ng·L~(-1)) on sludge from sedimentation tank were studied. The results showed that the mass concentrations of PFOA and PFOS in sludge wastewater and process water were 48.35～63.38 and 56.26～71.62 ng·L~(-1),respectively. Simultaneously,PFOA and PFOS concentrations in sludge from the middle sedimentation tank were 1.03, 1.54 ng·g~(-1)·dw(dry weight),respectively. And both of them were higher than that of sludge from the front and rear sections of sedimentation tank. The adsorption and desorption of PFCs on sludge reached equilibrium at 24 h and 36 h, respectively, while desorption hysteresis was observed during the desorption process. PFOA was basically reversible adsorbed on sludge, and about 30% of PFOS was irreversibly adsorbed on sludge. The adsorption capacity of PFOA was lower than that of PFOS, while the desorption rate of PFOA was higher than that of PFOS.
引文
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[3]Yang L P,Zhu L Y,Liu Z T.Occurrence and partition of perfluorinated compounds in water and sediment from Liao River and Taihu Lake,China[J].Chemosphere,2011,83(6):806-814.
[4]Zhao X L,Xia X H,Zhang S W,et al.Spatial and vertical variations of perfluoroalkyl substances in sediments of the Haihe River,China[J].Journal of Enviromental Sciences,2014,26(8):1557-1566.
[5]Bao J,Liu W,Liu L,et al.Perfluorinated compounds in urban river sediments from Guangzhou and Shanghai of China[J].Chemosphere,2010,80(2):123-130.
[6]Higgins C P,Luthy R G.Sorption of perfluorinated surfactants on sediments[J].Environmental Science&Technology,2006,40(23):7251-7256.
[7]周浩,孙敏.净水厂中全氟化合物分布特征及UV/SO32-的去除机理[J].中国给水排水,2017,33(19):6-10.
[8]Sun M,Zhou H,Xu B et al.Distribution of perfluorinated compounds in drinking water treatment plant and reductive degradation by UV/SO32-process[J].Environmental Science and Pollution Research,2017,25(8):7443-7453.
[9]Powley C R,George S W,Ryan T W,et al.Matrix Effect-Free Analytical Methods for Determination of Perfluorinated Carboxylic Acids in Environmental Matrixes[J].Analytical Chemistry,2005,77(19):6353-6358.
[10]张鸿,陈清武,王鑫璇,等.自来水处理工艺对溶解相中全氟化合物残留的影响[J].环境科学,2013,34(9):3467-3473.
[11]周华,陈卫,孙敏,等.南京城市给水厂排泥水节水潜力分析[J].给水排水,2009,35(11):18-21.
[12]孙敏,周园.净水厂污泥中多环芳烃和金属的分布特征[J].中南大学学报(自然科学版),2015,46(1):366-371.
[13]兰仲蕙,周萌,姚义鸣,等.全氟烷基酸类在土壤中的吸附解吸及淋溶行为研究[J].农业环境科学学报,2018,37(9):1884-1894.
[14]周园,孙敏.净水厂污泥中多环芳烃解吸试验研究[J].当代化工,2014,43(5):672-674.