Migration and fate of polycyclic aromatic hydrocarbons in bioretention systems with different media:experiments and simulations  

作　　者：Zhaoxin Zhang Jiake Li Zhe Liu Yajiao Li Bei Zhang Chunbo Jiang 

机构地区：[1]Institute of Land Engineering and Technology,Shaanxi Provincial Land Engineering Construction Group Co.,Ltd.,Xi’an 710075,China [2]State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China [3]School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China [4]College of Landscape Architecture and Art,Northwest A&F University,Yangling 712100,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第4期17-33,共17页环境科学与工程前沿（英文）

基　　金：the National Natural Science Foundation of China(Nos.52070157 and 52000150);the Scientific Research Item of Shaanxi Provincial Land Engineering Construction Group(China)(DJNY2022-30 and DJNY-2023-YB-31).

摘　　要：Polycyclic aromatic hydrocarbons(PAHs)present significant risks to human health owing to their carcinogenic,teratogenic,and mutagenic properties.The contamination of surface water with PAHs via runoff has become a prominent source of water pollution.While the capacity of bioretention systems to remove PAHs from runoff is recognized,the dynamics of PAH migration and degradation in these systems are not well-understood.This study aims to explain the migration and fate of PAHs in bioretention systems through a series of experiments and model simulations.This study constructed bioretention systems with three different media types and found that these systems achieved PAH load reductions exceeding 92%.Notably,naphthalene(NAP),fluoranthene(FLT),and pyrene(PYR)tended to accumulate in the media’s upper layer,at depths of 10 to 40 cm.To further analyze the migration and fate of PAHs during multi-site rainfall events and across prolonged operation,we applied the HYDRUS-1D model under three distinct scenarios.The findings of this study indicated that NAP degraded in 40 d,whereas FLT and PYR showed incomplete degradation after 120 d.During continuous rainfall events,there was no clear pattern of PAH accumulation;however,FLT and PYR persisted in the bioretention systems.The combination of experimental and simulation findings highlights the inevitable accumulation of PAHs during extended use of bioretention systems.This research provides a theoretical basis for improving operational efficiency,advancing PAH degradation in bioretention systems,and reducing their toxicity.

关 键 词：BIORETENTION Polycyclic aromatic hydrocarbons HYDRUS-1D Model simulation MIGRATION 

分 类 号：X592[环境科学与工程—环境工程]