OCCURRENCE,MIGRATION AND TRANSFORMATION OF EMERGING TRACE POLLUTANTS IN RECLAIMED WATER DURING RIVER RECHARGE
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.
reclaimed wateremerging trace pollutants(EMPs)river water replenishmentdischarging standardspeciation
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