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Abundance and characteristics of microplastics in drinking water treatment plants, distribution systems, water from refill kiosks, tap waters and bottled waters
Summary
This review summarizes research on microplastic contamination across the entire drinking water supply chain, from treatment plants to tap water and bottled water. Microplastics were found at every stage, with concentrations varying widely depending on location and treatment methods. The findings highlight that people are regularly consuming microplastics through their drinking water, though more standardized research is needed to fully understand the health implications.
Limited research studies have revealed the presence of microplastics (MPs) of different polymer types, shapes, and sizes in drinking water sources, influents of drinking water treatment plants (DWTPs), effluents of DWTPs, tap water, and bottled water. Reviewing the available information on MP pollution in waters, which is becoming more worrying in correlation with the increasing plastic production in the world every year, is noteworthy for understanding the current situation, identifying the deficiencies in the studies, and taking the necessary measures for public health as soon as possible. Therefore, this paper, in which the abundance, characteristics, and removal efficiencies of MPs in the processes from raw water to tap water and/or bottled water are reviewed is a guide for dealing with MP pollution in drinking water. In this paper, firstly, the sources of MPs in raw waters are briefly reviewed. In addition, the abundance, and characteristics (polymer type, shape, and size) of MPs in influents and effluents of DWTPs in different countries are reviewed and the effects of treatment stages (coagulation, flocculation, sedimentation, sand filtration, disinfection, and membrane filtration) of DWTPs on MP removal efficiency and the factors that are effective in removal are discussed. Moreover, studies on the factors affecting MP release from drinking water distribution systems (DWDSs) to treated water and the abundance and characteristics of MPs in tap water, bottled water and water from refill kiosks are reviewed. Finally, the deficiencies in the studies dealing with MPs in drinking water are identified and recommendations for future studies are presented.
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