再生水中新兴微量污染物赋存及在河道补水中的迁移转化

OCCURRENCE,MIGRATION AND TRANSFORMATION OF EMERGING TRACE POLLUTANTS IN RECLAIMED WATER DURING RIVER RECHARGE

市政再生水是城市河道补水的重要水源,对增强水体自净能力,提高水环境质量具有重要意义。但再生水中高频检出的新兴微量污染物(EMPs),对其受纳河道的生态安全构成了威胁。回顾了我国再生水发展历程,介绍了再生水回用标准和政策的演变及回用水质要求。以EMPs为核心,重点分析了再生水中药物和个人护理品类(PPCPs)、内分泌干扰物类(EDCs)、全氟化合物(PFCs)等典型EMPs的赋存特性和来源,提出EMPs在河道补水过程中主要通过动力运输、吸附与解吸、物理-化学迁移降解和生物降解4种途径实现迁移转化。通过分析EMPs对河道水体的生态风险,为再生水EMPs生态风险评估和安全回用提供控制思路和理论参考。未来在再生水河道回用中应重视EMPs在实际水体中的降解行为,并注重其监测管理。

Municipal reclaimed water plays a crucial role in water supplementation,significantly enhancing the self-purification capacity of water bodies and improving water environment quality.However,the prevalent presence of emerging trace pollutants(EMPs)in reclaimed water threatens the ecological security of rivers where it is reused.This article reviews the development process of reclaimed water in China,and introduces the evolution of standards and policies,as well as the requirements for reclaimed water quality.Focusing on the EMPs,occurrence characteristics and origins of typical EMPs such as pharmaceutical and personal care products(PPCPs),endocrine disrupting chemicals(EDCs),and perfluorinated compounds(PFCs)in reclaimed water are analyzed.It is proposed that EMPs achieve migration and transformation primarily through four pathways:dynamic transport,adsorption and desorption,physical-chemical migration and degradation,and biodegradation,during the process of river water replenishment.Analyzing the ecological risks of EMPs on river water bodies,provides insights and theoretical references for the ecological risk assessment of EMPs and the safe reuse of reclaimed water.In the future,the degradation behavior of EMPs in actual water bodies should be emphasized in the reuse of reclaimed water streams,and rigorous monitoring and management protocols for EMPs should also be implemented.