Roles of membrane and organic fouling layers on the removal of endocrine disrupting chemicals in microfiltration  

作　　者：Wenchao Xue Kang Xiao Peng Liang Xia Huang 

机构地区：[1]State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University [2]Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University [3]College of Resources and Environment, University of Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》2018年第10期176-184,共9页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51678336);the KWEF-AIT Research Grant,the President Fund for Science and Education Fusion of UCAS(No.Y552022Y00);the special fund of SKLECE,Chinese Academy of Sciences(No.KF2016-19)

摘　　要：To understand the adsorption behavior of endocrine disrupting chemicals（EDCs） is important for enhancing the treatment performance and preventing potential secondary pollution caused by EDCs desorption in a microfiltration system. The dynamic adsorption of four representative EDCs, namely estriol（E3）, 17β-estradiol（E2）, 17α-ethynylestradiol（EE2）, and 4-nonylphenol（4-NP） in a microfiltration system was investigated using the Thomas＇ model.The product of the equilibrium constant and the total adsorption capacity of the membrane,Ka, for E3, E2, EE2, and 4-NP were 4.91, 9.78, 15.6, and 826, respectively, strongly correlating with the compound octanol–water partition coefficient（KOW）. Adsorption appeared to be enhanced when organic fouling formed on the surface of membrane, indicating the role of an additional adsorption column for EDCs acted by a fouling layer in microfiltration. Results of a comparison between the Ka values for clean membrane and fouled membrane illustrated that the significant contribution made by fouling layers may be attributed to the foulant layer＇s hydrophobicity（in the case of calcium humate layer） and thickness（in the case of calcium alginate layer）. This study provided a novel perspective to quantitatively analyze the dynamic adsorption behavior of trace pollutants in membrane process.To understand the adsorption behavior of endocrine disrupting chemicals（EDCs） is important for enhancing the treatment performance and preventing potential secondary pollution caused by EDCs desorption in a microfiltration system. The dynamic adsorption of four representative EDCs, namely estriol（E3）, 17β-estradiol（E2）, 17α-ethynylestradiol（EE2）, and 4-nonylphenol（4-NP） in a microfiltration system was investigated using the Thomas＇ model.The product of the equilibrium constant and the total adsorption capacity of the membrane,Ka, for E3, E2, EE2, and 4-NP were 4.91, 9.78, 15.6, and 826, respectively, strongly correlating with the compound octanol–water partition coefficient（KOW）. Adsorption appeared to be enhanced when organic fouling formed on the surface of membrane, indicating the role of an additional adsorption column for EDCs acted by a fouling layer in microfiltration. Results of a comparison between the Ka values for clean membrane and fouled membrane illustrated that the significant contribution made by fouling layers may be attributed to the foulant layer＇s hydrophobicity（in the case of calcium humate layer） and thickness（in the case of calcium alginate layer）. This study provided a novel perspective to quantitatively analyze the dynamic adsorption behavior of trace pollutants in membrane process.

关 键 词：Endocrine disrupting chemicals Microfiltration membrane Dynamic adsorption Thomas＇ model Organic membrane fouling 

分 类 号：X592[环境科学与工程—环境工程]