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Detection and Occurrence of Microplastics through Municipal and Pilot-scale Drinking Water Treatment Plants
Summary
Researchers developed a new method for detecting and characterizing microplastics in drinking water samples from municipal and private treatment systems. They found microplastics in treated drinking water, though at lower concentrations than in source water, and identified fibers as the most common type. The study demonstrates that conventional water treatment does not completely remove microplastics from drinking water.
Concern regarding microplastic contamination in the environment by water providers and consumers has led to the investigation of microplastics in drinking water. Here, the development of a new method is described for microplastic analysis in drinking water samples, minimizing contamination and applying relevant QA/QC guidelines. The described method achieved an overall recovery of >80% for microplastics of various sizes, shapes, and composition, in drinking water matrices. Additionally, a full-scale conventional drinking water treatment plant employing coagulation, flocculation, filtration, and chlorination was sampled for microplastics, alongside a pilot-scale plant with eight parallel filters, receiving different treatment. Full-scale treatment removed 52% of microplastics from raw (42 ± 18 particles/L) to tap water (20 ± 8 particles/L). Ozonation, media type, biological contact, and flow rate through the filters contributed no additional removal. Coagulation, flocculation, and sedimentation accounted for 70% of particle removal, the highest removal of unit processes examined.