Hashimoto T, Murakami T
Research and Development Department, Japan Sewage Works Agency, Shimosasame 5141, Toda, Saitama 335-0037, Japan.
Water Res. 2009 Feb;43(3):573-82. doi: 10.1016/j.watres.2008.10.051. Epub 2008 Nov 9.
The removal and degradation characteristics of natural and synthetic estrogens by activated sludge were investigated by a series of batch experiments using the activated sludge samples of four actual wastewater treatment plants and synthetic wastewater spiked with estrogen. The rapid removal and degradation of 17beta-estradiol (E2) and estrone (E1) were observed by the activated sludge samples of the oxidation ditch process which operated at higher solids retention time (SRT). On the other hand, E1 tended to remain both in the water phase and the sludge phase in the activated sludge samples of the conventional activated sludge process which operated at lower SRT. The anoxic condition was considered to be not favorable to the effective removal of estrogens as compared with the aerobic condition. The removal and degradation of EE2 showed the lag phase, which neither E2 nor E1 showed, but EE2 was finally removed and degraded completely after 24h. The removal of estrogens in the water phase did not follow the first-order-rate reaction because a large part of the spiked estrogen was immediately removed from the water phase to the sludge phase by adsorption.
通过一系列批次实验，利用四个实际污水处理厂的活性污泥样本以及添加了雌激素的合成废水，研究了活性污泥对天然和合成雌激素的去除及降解特性。在较高固体停留时间（SRT）运行的氧化沟工艺活性污泥样本中，观察到17β-雌二醇（E2）和雌酮（E1）被快速去除和降解。另一方面，在较低SRT运行的传统活性污泥工艺活性污泥样本中，E1倾向于同时保留在水相和污泥相中。与好氧条件相比，缺氧条件被认为不利于雌激素的有效去除。EE2的去除和降解呈现出E2和E1均未表现出的滞后阶段，但EE2最终在24小时后被完全去除和降解。水相中雌激素的去除不遵循一级速率反应，因为大部分添加的雌激素通过吸附立即从水相转移到污泥相中。
