Hashimoto T, Takahashi K, Murakami T
R&D Dept., Japan Sewage Works Agency, 5141 Shimo-sasame, Toda, Japan 335-0037.
Water Sci Technol. 2006;54(10):87-93. doi: 10.2166/wst.2006.806.
Since the natural estrogens 17 beta-estradiol (E2) and estron (E1), and the synthetic estrogen 17 alpha-ethynyl estradiol (EE2) have strong endocrine disrupting effects and the tendency to persist in effluent from wastewater treatment plants, effective measures are needed to remove them from wastewater. In this research, to gain an understanding of the characteristics of estrogen decomposition by ozonation, experiments were conducted using effluent from an actual wastewater treatment plant. In this experiment, estrogen was added to effluent at a concentration of 200 ng/l and 20 ng/l before the ozonation experiments. The results showed 90% or more of estrogen concentration and estrogenic activity of E2, El and EE2 to be removed at an ozone dose of 1 mg/l. At an ozone dose of 3 mg/l, the estrogen concentration and estrogenic activity of E2, El and EE2 in the treated water fell below the detection limit. The removal rate was not influenced by the kind of estrogen. No generation of byproducts with estrogenic activity was observed. The authors conclude that estrogen in secondary treated wastewater can be almost entirely removed at the practical ozone dose rate applied for the purpose of disinfection, which is up to about 5 mg/l.
由于天然雌激素17β-雌二醇（E2）和雌酮（E1）以及合成雌激素17α-乙炔基雌二醇（EE2）具有很强的内分泌干扰作用，且有在污水处理厂流出物中持续存在的趋势，因此需要采取有效措施从废水中去除它们。在本研究中，为了了解臭氧化分解雌激素的特性，使用实际污水处理厂的流出物进行了实验。在该实验中，在臭氧化实验之前，以200 ng/l和20 ng/l的浓度将雌激素添加到流出物中。结果表明，在臭氧剂量为1 mg/l时，E2、E1和EE2的雌激素浓度和雌激素活性去除率达到90%或更高。在臭氧剂量为3 mg/l时，处理后水中E2、E1和EE2的雌激素浓度和雌激素活性降至检测限以下。去除率不受雌激素种类的影响。未观察到具有雌激素活性的副产物生成。作者得出结论，在用于消毒的实际臭氧剂量率（高达约5 mg/l）下，二级处理废水中的雌激素几乎可以完全去除。
