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The disinfectant residues promote the leaching of water contaminants from plastic pipe particles
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This study found that trace amounts of disinfectants commonly used in water treatment can accelerate the aging of plastic water pipes, causing them to release more contaminants. When plastic pipe particles were exposed to chlorine-based disinfectants and ozone, they leached higher levels of organic chemicals and microplastics into the water. The findings raise concerns about how the interaction between water treatment chemicals and plastic plumbing may affect drinking water quality.
Disinfection treatment is an indispensable water purification process, but it can leave trace concentrations of disinfectant in the purified water. Disinfectants oxidation can age plastic pipes and release hazardous microplastics and chemicals into drinking water. Lengths of commercially-available unplasticized polyvinyl chloride and polypropylene random copolymer water pipe were ground into particles and exposed to micro-molar concentrations of ClO, NaClO, trichloroisocyanuric acid, or O for up to 75 days. The disinfectants aged the plastic and changed its surface morphology and functional groups. Meanwhile, disinfectants could significantly promote the release of organic matter from plastic pipes into the water. ClO generated the highest concentrations of organic matter in the leachates from both plastics. Plasticizers, antioxidants and low molecular weight organic matter were detected in all of the leachates. Leachate samples inhibited the proliferation of CT26 mouse colon cancer and induced oxidative stress in the cells. Even trace concentrations of residual disinfectant can constitute a drinking water risk.
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Chlorination-driven leaching and characterization of dissolved organic matter from PVC microplastics
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PVC plastic pipes are common in water systems, and this study found that chlorine (the disinfectant used to keep tap water safe) actually breaks down PVC microplastics faster, causing them to release more dissolved carbon-based compounds into the water, especially early on and at higher chlorine levels. This matters because it suggests the very process we use to disinfect drinking water may be speeding up plastic breakdown in pipes, potentially adding more tiny plastic particles and byproducts to the water we drink, though more research is needed to know exactly how this affects human health.
Factors affecting the leaching of micro and nanoplastics in the water distribution system
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Researchers studied how plastic water pipes in distribution systems leach micro- and nanoplastics into drinking water under varying conditions of pH, chlorine levels, and pipe material. They found that higher pH and the presence of free chlorine both contributed to increased particle release from the pipes. The findings raise concerns that everyday drinking water infrastructure may be an overlooked source of human microplastic exposure.
Microplastics generation from PVC pipes in drinking water distribution systems: Effects of aging and flow conditions
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Old PVC pipes in your home's plumbing can shed microplastics into your tap water, and this study found the main culprit is chlorine (used to disinfect water) slowly eating tiny holes into the pipe's inner surface over time. The longer pipes were exposed to chlorine, the more microplastic particles broke off, and running water made things much worse than water just sitting still, releasing nearly 7 times more plastic bits after about 3 months of aging. This matters because it suggests the water infrastructure delivering your drinking water may be a growing, largely invisible source of microplastic exposure as pipes age.
The aging and pollution behavior of microplastics in tap water supply system subjected to residual chlorine exposure
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Researchers studied how residual chlorine in tap water distribution systems ages ABS and polycarbonate microplastics, finding that chlorine exposure caused surface changes and increased hydrophilicity of the particles. The aging microplastics released dissolved organic matter into the water and, when interacting with chlorine, produced trichloromethane, a disinfection byproduct. The findings suggest that microplastics in drinking water infrastructure may contribute to the formation of harmful chemical byproducts.
Microplastics and chemical leachates from plastic pipes are associated with increased virulence and antimicrobial resistance potential of drinking water microbial communities
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Researchers found that microplastics and chemical leachates released from polypropylene drinking water pipes can promote antimicrobial resistance and virulence in the microbial communities that form inside the pipes. Exposure to chlorination, heating, and freeze-thaw cycles accelerated microplastic generation and chemical leaching from the pipes. The findings suggest that plastic plumbing materials may be an underappreciated factor in drinking water safety.
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