包埋颗粒对污水中雌激素的吸附和生物降解研究

Adsorption and Biodegradation of Estrogens in Wastewater by Embedded Pellets

广泛存在于生活污水和自然水体中的雌酮(E1)、17β-雌二醇(E2)和17α-乙炔基雌二醇(EE2)是活力最强的雌激素,可通过生物降解去除,且去除效率与硝化程度呈正相关。为此研究了包埋硝化菌颗粒对模拟污水厂尾水中三种雌激素的去除特性。结果表明,在包埋硝化菌投加体积比为5%时,对E1、E2和EE2的去除率分别为65.6%、98.8%和72.0%,其中生物降解分别占40.0%、54.2%和0。在水温为15℃的条件下,包埋硝化菌颗粒对E1、E2、EE2的生物降解反应速率常数分别为0.036 5、0.093 5、0.000 8 h-1,降解过程均符合一级反应动力学模型。

Estrone （E1）, 17β-estradiol （E2） and 17α-ethinylestradiol （EE2） are the most po- tent estrogens found in municipal wastewater and aquatic environment. They can be biodegraded by the wastewater treatment process, and the removal efficiency is positively associated with the degree of nitrifi- cation. Therefore, the removal of these estrogens from the simulated effluent by the cultivated embedded nitrifying pellets was investigated. The results showed that when the dosing ratio was 5%, the embedded nitrobacteria could eliminate E1, E2 and EE2 at removal rates of 65.6%, 98.8% and 72.0% respec- tively, and biodegradation accounted for 40.0%, 54.2% and 0 respectively. The biodegrada followed the first-order reaction models, with the rate constants of 0. 036 5 h-1, 0. 093 tion kinetics 5 h-1 and 0. 000 8 h-1 for El, E2 and EE2 respectively at 15 ℃.