State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
J Environ Sci (China). 2018 Oct;72:176-184. doi: 10.1016/j.jes.2018.01.004. Epub 2018 Jan 17.
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 (K). 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.
为了提高微滤系统中处理性能，并防止因内分泌干扰物（EDCs）解吸而造成潜在的二次污染，了解 EDCs 的吸附行为非常重要。本研究采用 Thomas 模型研究了四种代表性 EDCs（雌三醇（E3）、17β-雌二醇（E2）、17α-乙炔基雌二醇（EE2）和 4-壬基酚（4-NP））在微滤系统中的动态吸附行为。E3、E2、EE2 和 4-NP 的膜平衡常数与总吸附容量的乘积 Ka 分别为 4.91、9.78、15.6 和 826，与化合物辛醇-水分配系数（K）强烈相关。当有机污染物在膜表面形成时，吸附作用增强，表明在微滤过程中，污染层作为一个额外的吸附柱对 EDCs 起作用。清洁膜和污染膜的 Ka 值比较结果表明，污染层的显著贡献可能归因于污染层的疏水性（腐殖酸钙层的情况）和厚度（藻酸钠钙层的情况）。本研究为定量分析膜过程中痕量污染物的动态吸附行为提供了新的视角。
