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From Source to Sip: Evaluating the Removal of Micro- and Nanoplastics in Conventional Drinking Water Treatment Plants
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Scientists tested water from four treatment plants that pull from Lake Erie and found that standard treatment removes about half to three-quarters of the tiny plastic particles (called micro- and nanoplastics) present in the raw water. Even so, treated tap water still contained roughly 2 million plastic particles per liter—meaning conventional treatment doesn't eliminate these particles, it just reduces them. This matters because it helps researchers understand how much plastic exposure people may get from their tap water, though the health effects of ingesting these particles are still being studied.
High Resolution Image Download MS PowerPoint Slide Micro- and nanoplastics (MNPs) are found in drinking water resources, and characterizing their removal during treatment remains a challenge. In this study, we analyzed raw and treated drinking water from four conventional treatment plants that use Lake Erie as their source and differ based on variations in the design of specific unit operations. MNPs down to 0.5 μm were quantified and identified using scanning electron microscopy and optical photothermal infrared spectroscopy. Raw water concentrations were 2–12 million particles/L, resulting in mass concentrations of 1.8–14.5 μg/L. Removal during treatment averaged 54% and 75% for particle and mass concentrations, respectively. Nanoparticles (NPs) accounted for 47–70% of the measured particles in all samples. Interestingly, there was no significant difference in the treated water MNP concentrations, which averaged 2.0 million particles/L, equivalent to an estimated mass concentration of 1.5 μg/L. The most prevalent polymers were polyamide, polyesters, and rubber, and there were notable differences in the removal of polyesters and rubber MNPs smaller than 5 μm at three of the four plants. Overall, these results increase our understanding of MNP removal during conventional drinking water treatment and improve our understanding of human exposure to MNPs through drinking water.
More Papers Like This
From Sourceto Sip: Evaluating the Removal of Micro-and Nanoplastics in Conventional Drinking Water Treatment Plants
AI summary Read the abstract
Scientists tested water from four treatment plants that pull from Lake Erie and found that standard treatment removes about half of the tiny plastic particles (microplastics and even smaller nanoplastics) present in the raw water, cutting their weight by about 75%. Even so, treated tap water still contained roughly 2 million plastic particles per liter, showing that conventional treatment can't fully eliminate these particles — meaning we're still likely drinking small amounts of plastic with every glass of tap water. More research is needed to understand what this level of exposure means for our health, but this study helps scientists pinpoint which treatment steps work best
Micro- and nanoplastics in drinking water: the review
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Tiny plastic particles called micro- and nanoplastics have been found in both tap and bottled water, and this review pulls together what scientists currently know about where they come from and whether water treatment plants can actually filter them out. The takeaway: current treatment methods only partially remove these particles, and researchers still don't fully understand what health risks come from swallowing them regularly. More study is needed, but for now, it's a reminder that "clean" drinking water may still contain plastic bits too small to see.
Identification and characterization of microplastics in drinking water treatment plant
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Tiny plastic particles called microplastics, small enough to slip past standard filters, are showing up in the water treatment plants that clean our drinking water. This study looked at how well current treatment methods actually remove these particles, since even after processing, some microplastics may still end up in the water coming out of your tap. Because we don't yet fully understand what swallowing these particles over time does to our bodies, tracking where they slip through the system is an important step toward making drinking water safer.
Occurrence, characteristics, and removal of microplastics in conventional and seawater reverse osmosis drinking water treatment plants
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Researchers tested tap water treatment plants in Iran and found that both regular water treatment and seawater desalination remove most tiny plastic particles (microplastics) from drinking water, about 76% to 87%, but don't eliminate them completely. Even after treatment, small amounts of plastic bits, mostly from packaging materials like PET and PP, still ended up in the water people drink, though at low enough levels that the estimated daily intake was very small. This matters because it shows current water treatment is fairly effective but not perfect, highlighting a need for better filtration technology to catch the plastics that slip through.
Mass Concentration and Removal Characteristics of Microplastics and Nanoplastics in a Drinking Water Treatment Plant
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Researchers measured both microplastics and nanoplastics by mass throughout an entire drinking water treatment plant, finding that raw water contained about 9.6 micrograms per liter of plastic polymers. Treatment reduced this by roughly 92%, but nanoplastics and very small microplastics were harder to remove than larger particles. The study highlights the importance of measuring plastic contamination by mass, not just by particle count, for a more accurate picture of exposure through drinking water.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.