A thermodynamic analysis on adsorption of estrogens in activated sludge process.
A thermodynamic analysis on adsorption of estrogens in activated sludge process.
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DOI：
10.1016/j.watres.2007.01.058
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发表时间：
2007-06
期刊：
影响因子：
12.8
通讯作者：
Yong-xiang Ren;K. Nakano;M. Nomura;N. Chiba;O. Nishimura
中科院分区：
文献类型：
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作者：
Yong-xiang Ren;K. Nakano;M. Nomura;N. Chiba;O. Nishimura
采用80℃热处理30min的失活污泥，研究了雌酮（E1）、17β-雌二醇（E2）、雌三醇（E3）、17α-炔雌二醇（EE2）和雌马酚的吸附行为。热处理几乎没有改变活性污泥的吸附特性。在20℃条件下，所有雌激素在10min内达到吸附平衡，同时实现了较高的雌激素去除率。平衡数据用Freundlich等温线拟合得很好。E1、E2、E3和EE2在AS体系中的吸附行为与它们的Kow值无关。热力学分析表明，E1、E2、E3和EE2的吸附行为可以认为是一个放热、物理和可逆的过程，因此它们在较低温度下具有较高的吸附能力。对马酚的吸附是一个吸热、化学、不可逆的过程。
The adsorption behaviors of estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethinylestradiol (EE2), and equol were studied with a deactivated sludge subjected to heat treatment at 80°C for 30min. The heat-treatment hardly changed the adsorption features of activated sludge (AS). The adsorption equilibrium of all estrogens was approached within 10min at 20°C, and a high removal of estrogens was achieved simultaneously. The equilibrium data were well fitted by a Freundlich isotherm. The adsorption behaviors of E1, E2, E3 and EE2 in the AS system were independent of their Kow values. Thermodynamic analysis revealed that the adsorption behaviors of E1, E2, E3 and EE2 could be considered as an exothermic, physical and reversible process, resulting in their higher adsorption capacities at lower temperature. Regarding equol, its adsorption was an endothermic, chemical and irreversible process.