Microplastics in wastewater and sludge from centralized and decentralized wastewater treatment plants: Effects of treatment systems and microplastic characteristics

被引：16

作者：

Maw M.M. ^{[1
]}

Boontanon N. ^{[2
]}

Aung H.K.Z.Z. ^{[1
]}

Jindal R. ^{[1
]}

Fujii S. ^{[3
]}

Visvanathan C. ^{[1
]}

Boontanon S.K. ^{[1
,3
]}

机构：

[1] Graduate Program in Environmental and Water Resources Engineering, Department of Civil and Environmental Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom

[2] Research Center and Technology, Development for Environmental Innovation, Faculty of Environment and Resource Studies, Mahidol University, Nakhon Pathom

[3] Graduate School of Global Environmental Studies, Kyoto University, Kyoto

来源：

Chemosphere | 2024年 / 361卷

关键词：

Activated sludge process; Hydraulic retention time; Microplastic fragmentation; Microplastics; Removal efficiency; Wastewater treatment plant;

D O I：

10.1016/j.chemosphere.2024.142536

中图分类号：

学科分类号：

摘要：

Domestic wastewater treatment plants (WWTPs) play a vital role in limiting the release of microplastics (MP) into the environment. This study examined MP removal efficiency from five centralized and four decentralized domestic WWTPs in Bangkok, Thailand. MP concentrations in wastewater and sludge were comparable between centralized and decentralized WWTPs, despite these decentralized WWTPs serving smaller populations and having limited treatment capacity. The elimination of MPs ranged from 50 to 96.8% in centralized WWTPs and 14.2–53.6% in decentralized WWTPs. It is noted that the retained MPs concentrations in sludge ranged from 20,000 to 228,100 MP/kg dry weight. The prevalence of synthetic fibers and fragments could be attributed to their pathways from laundry or car tires, and the accidental release of a variety of plastic wastes ended up in investigated domestic WWTPs. Removal of MPs between the centralized and decentralized WWTPs was influenced by several impact factors including initial MP concentrations, longer retention times, MP fragmentation, and variations of MP concentrations in sludge leading to different activated sludge process configurations. Sewage sludge has become a primary location for the accumulation of incoming microplastics in WWTPs. The MPs entering and leaving each unit process were varied due to the unique characteristics of MPs, and their different treatment efficiencies. While the extended hydraulic retention period in decentralized WWTPs decreased the MP removal efficacy, the centralized WWTP with the two-stage activated sludge process achieved the highest MP removal efficiency. © 2024 The Authors

引用

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