城市尾水补充河湖水体是缓解我国水资源危机的主要途径之一，但尾水中含有的一些新兴污染物，如内分泌干扰物（EDCs）等，由于目前尚缺少排放控制的有效判据，使得其不断进入水体，给水环境带来一定的生态和健康风险。尾水中的EDCs进入河流后，其归宿取决于一系列的物理、化学和生物过程，其中底质微生物降解和底质吸附是其衰减的主要机制。本课题从底质微生物体系特征研究着手，以尾水入河混合区底质微生物为研究对象，采用野外观测和室内模拟相结合的方法，探究底质微生物的时空变化规律及其环境响应机制，阐明底质中EDCs降解菌的生长和降解特性，研究实际水体中EDCs的衰减规律，并剖析底质微生物变化与EDCs衰减的动态交互关系，获取扩散-吸附-降解多机制耦合作用下EDCs的衰减系数，进一步发展完善河流水体EDCs衰减模型，从而提出城市尾水EDCs的排放阈值判据，为水体环境质量标准完善和水体新兴有机污染物防控提供依据。

Wastewater reuse has been one of the most important way to alleviate water crisis in China. However, the presence of endocrine disrupting chemicals (EDCs) in reused wastewater could bring ecological and health risks due to the lack of related control strategy. The decay of EDCs in river is mainly attributed to hydraulic diffusion, sediment adsorption, and biodegradation. The aim of this research is to study the responses of sediment microorganism to environmental factors and their impact on the decay of endocrine disrupting chemicals in a river mixing zone. The field tests and model experiments in laboratory will be used to study the response mechanisms of sediment microorganism to environmental factors. The relationship between variation of sediment microorganism and EDCs biodegradation would be clarified through investigating the biodegradation of EDCs. The decay coefficient would be obtained based on the equations of mass conservation, adsorption and desorption, as well as biodegradation. The decay modeling of EDCs in river can be developed on the basis of environmental fluid dynamics code. The developed model can be used for proposing the discharge standard of EDCs in the effluent of uran wastwater treatment plants. The above results can not only provide the scientific mean for establishing water environmental quality standards, but also provide scientific basis for guaranteeing the security of natural water.