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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.
Microplastics (MPs) are emerging contaminants increasingly detected in drinking water systems worldwide. However, comparative information on their occurrence and removal in drinking water treatment plants using different source waters remains scarce. This study evaluated the occurrence, characteristics, and removal efficiency of MPs in two drinking water treatment systems in Iran: a conventional freshwater DWTP and a seawater reverse osmosis (SWRO) desalination plant. In the freshwater DWTP, MP concentrations decreased from 118 ± 28 MPs/m³ in raw water to 28± 11 MPs/m³ in treated water, corresponding to a 76% removal efficiency. Fragment-shaped MPs in the 100–500 μm size range, predominantly blue in color, were the most abundant particles, while polyethylene terephthalate (PET), polypropylene (PP), and polyvinyl chloride (PVC) were the dominant polymers. In the SWRO desalination plant, MP concentrations declined from 140 ± 53 MPs/m³ in raw seawater to 17.6± 12 MPs/m³ after treatment, achieving an 87% removal efficiency. Fiber-shaped MPs measuring 500–1000 μm, mainly white and black, predominated, with polyethylene (PE) and PP identified as the most abundant polymers. The estimated daily intake ranged from 0.0008 to 0.006 items/kg/day. These findings provide practical insights into the occurrence, characteristics, and fate of MPs in freshwater and desalination-based water systems.
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Researchers investigated microplastic occurrence and removal efficiency across treatment stages of a drinking water treatment plant in Iran, finding an influent concentration of 1597.7 MPs/L with an overall removal efficiency of 83.7%, yet still discharging an estimated 2.25 x 10^11 MPs daily into the distribution system, with PP, PE, and PET as the dominant polymers.
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Researchers analyzed raw and treated water from three water treatment plants and found microplastics in all samples, though treatment reduced particle counts by roughly 70 to 80 percent. The vast majority of detected particles were smaller than 10 micrometers, a size range often missed by other studies. The findings highlight that while water treatment removes most microplastics, very small particles can still pass through conventional filtration systems.
Occurrence and removal of microplastics in three drinking water treatment plants and commercial bottled water brands in Jordan
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Researchers found tiny plastic particles called microplastics in all drinking water sources they tested in Jordan, including tap water from treatment plants and bottled water from stores. While water treatment plants removed 65-81% of these plastic particles, they couldn't eliminate them completely, and bottled water actually contained slightly more microplastics than treated tap water. This matters because people are drinking these plastic particles every day, though scientists are still studying what long-term health effects this might have.
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.
Identification of Microplastics in Conventional Drinking Water Treatment Plants in Tehran, Iran
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Researchers investigated microplastic occurrence at multiple treatment stages in three conventional drinking water treatment plants in Tehran, Iran, finding microplastics at all stages including in finished drinking water. The study confirms that conventional treatment processes do not fully remove microplastics from drinking water, creating a direct route of human exposure through tap water consumption.
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