零价铁协同厌氧微生物去除典型雌激素污染物的过程探索和机理研究

More and more attention has been paied on estrogen, owing to its high toxicity, low degradability, easily enrichment and trace concentration in water bodies. The estrogens in the water body from Wastewater Treatment Plant would be absorbed by water sediment. The estrogens accumulated in the sediment will become a future source of estrogens in the water whenever the system is disrupted. If the estrogen can be biodegraded by the anaerobic microorganism in the sediments, it will provide an insight into the water environment security and give it an effective safeguard. Therefore, the work will aim to establish an anaerobic bilogical system degrading typical estrogen (represented by E1, E2 and EE2) with zero-valent iron (ZVI), and research the absorption and biodegration of the estrogen in the system. The biodegration intermediate will be detected in the biodegration process of the estrogen. The effect of ZVI on the estrogen removal by anaerobic microorganism will be discussed here.The work will also expose the effect of the corrosion product (H2、Fe2+、Fe3+) of ZVI on the estrogen removal. Besides, the relation among the ZVI corrosion process, the estrogen degradation process and the biological community will be analyzed. It is expected that these work can provide a theoretical support for anaerobic degradation of estrogen in the sediments.

雌激素污染物具有毒性高、难降解、易富集及痕量存在于水体的特征，这些污染物的去除已成为全球关注热点。排入水环境体系的雌激素被水体沉积层吸附，如其能在沉积层厌氧环境去除，则能避免在其水体环境紊乱或者受干扰的情况下成为雌激素污染物的新来源。因此，基于为水环境安全提供有效保障，本课题提出零价铁协同沉积层厌氧微生物去除典型雌激素E1、E2和EE2的研究，研究雌激素在沉积层厌氧生物系统的生物吸附和生物降解，探讨其生物降解中间产物，探讨零价铁在雌激素厌氧去除过程的协同作用，分析零价铁及其腐蚀产物(H2、Fe2+、Fe3+)对雌激素厌氧去除的作用，解析零价铁腐蚀过程与雌激素降解过程及生物组成和群落之间的关系。以期为沉积层厌氧微生物降解雌激素提供理论依据，为环境体系中雌激素的去除提供一定指导意义。

抗生素的大量使用及生产加工此类物质工厂废水的排放导致水体中雌激素物质数量和种类是越来越多。n/g级雌激素含量就对生物体有着重大的毒害作用。以活性污泥为主体的生物处理对雌激素并不能很好的去除，城镇污水处理厂出水中的雌激素是受纳水体中雌激素的主要来源之一。本研究以厌氧微生物为主体，分别研究零价铁协同厌氧颗粒污泥对雌激素的吸附去除和生物降解。试验发现投加零价铁的厌氧系统对雌激素E2的吸附去除和生物去除效果更佳；动力学分析厌氧颗粒污泥对雌激素E2的吸附同时由膜扩散和内扩散控制；米门方程揭露零价铁的投加促使厌氧颗粒污泥对E2的生物去除速率提升2倍；微生物种群分析得知投加零价铁后甲烷微菌目数量增加，出现了Bacteroidetes vadinHA17（拟杆菌）微生物，微生物多样性增加；建立了高抗E2冲击负荷能力的UASB零价铁协同厌氧颗粒物去除系统。本研究可为雌激素的厌氧生物去除提供理论方法和数据支撑，期望为水环境的安全保障提供一定的理论支撑。