近年来，微塑料作为一种新兴环境污染物，越来越受关注。污水处理厂作为水体中微塑料的重要来源，并且微塑料在污水处理系统的迁移转化规律尚不明晰。基于此，本项目拟以典型城市生活污水处理工艺为背景，微塑料颗粒为研究对象，以期建立基于生活污水体系的高效的微塑料提取、分析、检测方法；系统分析微塑料颗粒在污水处理系统各工艺单元的空间分布规律；分析不同生化条件下，微塑料颗粒的去除效率；探究微塑料存在条件下，反应器中污泥形态、活性、群落结构、COD、氨氮等指标等变化规律，系统判断及评价污水处理系统的稳定性；以污水处理系统中检出频率较高的ECDs、PPCPs、POPs等微量有机污染物为对象，研究其与微塑料颗粒共存条件下在污水处理系统中的迁移转化规律及协同净化机制。希冀通过本项目的研究，系统阐述微塑料颗粒在污水处理系统中的环境行为，为减少污水处理系统外排微塑料颗粒提供理论依据。

Microplastics (MPs) have been identified as emerging contaminants in aquatic environments and has been raising increasingly concern in recent years. The waste water treatment plant (WWTP) is considered as an important resource of MPs. However, the fate of MPs in the WWTP system is not clear. Thus, this project intend to explore an efficient extraction, analysis and detection method for MPs detection from sewage. The spatial distribution of MPs among different processes of water treatment system will be revealed. The removal efficiency of MPs under different biochemical conditions will be evaluated. The stability of wastewater treatment systems when MPs existed will be evaluated according to the morphology, activity, community structure of activated sludge and some water quality index such as COD and ammonia concentration. The transportation, fate and removal mechanism of the coexistence of MPs and some trace organic pollutants with high frequency detection such as ECDs、PPCPs、POPs in the WWTP system will also be evaluated. We hope this project will eventually be able to elaborate the environmental behavior of MPs in the WWTP system, and to provide a theoretical basis for reducing the discharge of MPs from WWTP system.