Microplastic transport from a wastewater treatment plant into Qiantang River,an estuarine river  

作　　者：Yuntao ZHANG Huijun LIU Luyi ZHANG Yuan GAO Yong LIU Wenzhou FAN Xiaoying ZHOU Wei HUANG Zhiheng LI Wenlu ZHAO 

机构地区：[1]School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310018,China [2]Zhejiang Institute of Hydraulics&Estuary(Zhejiang Institute of Marine Planning and Design),Hangzhou 310020,China [3]Key Laboratory of Marine Ecosystem and Biogeochemistry,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

出　　处：《Journal of Oceanology and Limnology》2025年第2期346-359,共14页海洋湖沼学报(英文)

基　　金：Supported by the National Natural Science Foundation of China(No.42107268);the“Digital+”Discipline Construction Management Project of Zhejiang Gongshang University(No.SZJ2022A008)。

摘　　要：Microplastics(MPs)have garnered increasing research attentions due to their ubiquitous presence in the environment and consequential impacts on both ecosystems and human health.Wastewater treatment plants(WWTPs)are identified as major sources of MPs in aquatic environments,as they receive anthropogenic MPs from household and industrial sewer networks.Based on treated wastewater samples collected in October 2018 from a WWTP in Hangzhou City,China,the MP transport into the Qiantang River before heading into Hangzhou Bay,East China Sea,was investigated.To determine the abundance and characteristics of MPs,the quantities of MPs released into the environment from the WWTP in different treatment stages were estimated,and their migration was simulated using numerical modeling techniques.Results show that the abundance of MPs in the effluent of the WWTP was 1.3 pieces/L,with a daily discharge of 7.6×10^(8)pieces of MPs into the Qiantang River.Polyether sulfone(PES),rayon,and polyethylene terephthalate(PET)were identified from MPs,being dominated by polypropylene(PP).MPs predominantly displayed fibrous and fragmented shapes.Household laundering and plastic product usage were major sources of MPs,with mechanical wear during treatment potentially contributing to the transformation from primary to secondary MPs.After 45 days of transport simulation,a high abundance zone of MPs was observed in the southern region of Hangzhou Bay,with its diffusion range being influenced by the combined effects of river runoff and tides.The spatial distribution range was significantly greater during the spring tide compared to that in the neap tide,and there were varying degrees of MP accumulation in the upper reaches of the wastewater outlet as runoff decreased.This study integrated the emissions and transport of MPs from WWTPs to estuarine rivers,thereby providing valuable scientific guidance for future regional control measures and ecological risk assessments of MPs.

关 键 词：microplastic(MP) wastewater treatment plant(WWTP) TRANSPORT numerical simulation Qiantang River 

分 类 号：X52[环境科学与工程—环境工程]