Sorption of perfluorooctane sulfonate and perfluorooctanoate on activated sludge.
Sorption of perfluorooctane sulfonate and perfluorooctanoate on activated sludge.
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DOI：
10.1016/j.chemosphere.2010.08.009
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发表时间：
2010-09
期刊：
影响因子：
8.8
通讯作者：
Qin Zhou;S. Deng;Qiaoying Zhang;Qing Fan;Jun Huang;Gang Yu
中科院分区：
文献类型：
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作者：
Qin Zhou;S. Deng;Qiaoying Zhang;Qing Fan;Jun Huang;Gang Yu
全氟化合物（PFCs）作为一类新兴的污染物，近年来引起了人们的极大关注。采用活性污泥吸附水溶液中的全氟辛烷磺酸（PFOS）和全氟辛酸（PFOA），研究其在污水处理厂中的吸附行为和可能的吸附机理.进行了批量实验，包括吸附动力学，等温线，溶液pH值和温度的影响。吸附动力学表明，吸附在11h左右达到平衡。pH值和zeta电位的影响表明，静电斥力阻碍了PFOS和PFOA的吸附，但活性污泥异质表面的蛋白质组成有利于PFOS和PFOA的吸附。PFOS和PFOA的吸附等温线以及不同碳链长度和不同官能团的PFCs的比较吸附表明，疏水相互作用也参与了吸附过程。此外，还观察到活微生物对活性吸附。计算的分配系数表明，PFOS比PFOA更容易被活性污泥吸附。
Perfluorinated compounds (PFCs) as one class of emerging pollutants have caused great attention in recent years. In this study, activated sludge was used to adsorb perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) in aqueous solution in order to investigate their sorption behavior and possible uptake mechanism in wastewater treatment plants (WWTPs). Batch experiments including sorption kinetics, isotherm, and effect of solution pH and temperature were carried out. The sorption kinetics indicated that the equilibrium was reached within about 11h. The effect of pH and the zeta potential measurement implied that electrostatic repulsion prevented their sorption, but the protein composition on the heterogeneous surface of activated sludge was favorable for the sorption of PFOS and PFOA. The sorption isotherms of PFOS and PFOA as well as the comparative sorption of other PFCs with different CF chain length and different functional groups suggested that hydrophobic interaction also participated in the sorption process. Additionally, the active sorption on the living microorganism was also observed. The calculated distribution coefficient indicated that PFOS had a higher sorption tendency to activated sludge than PFOA.