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Transformation of microplastics during UV-LED based water disinfection: Mechanistic insights and environmental implications
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Researchers investigated how UV-based water disinfection treatments transform the physical and chemical properties of common microplastics like polystyrene, polyethylene, and PVC. They found that treatment created surface cracks, reduced water repellency, and generated various breakdown compounds, some of which showed toxicity to aquatic organisms. The study highlights that while UV disinfection effectively treats pathogens, it may inadvertently create new environmental risks by altering microplastics in the water supply.
Microplastic (MP) pollution poses an urgent environmental challenge. UV-based disinfection processes generate oxidative radicals (e.g., hydroxyl (HO•) and chloride radicals (Cl•, Cl2•¯)), which may alter MPs' polymer structures during water treatment. However, their impacts on MPs' characteristics and environmental behaviors remain insufficiently understood. This study evaluated UV/H2O2, UV/chlorine, and UV/peracetic acid treatments on polystyrene, polyethylene, and polyvinyl chloride MPs. Spectroscopic and microscopic analysis revealed significant morphological changes, including surface cracks and pits. Chemically, oxygen-containing functional groups (e.g., carboxyl, hydroxyl) formed, while water contact angle tests showed decreased hydrophobicity. LC-MS identified various low- and high-molecular-weight degradation products. Acute toxicity assessments (using ECOSAR software) indicated that small-molecule products from polystyrene and polyvinyl chloride MPs showed high toxicity, while medium-molecule products from polyethylene MPs also exhibited notable toxicity. These findings highlight the formation of potentially hazardous byproducts during UV-based disinfection. We further assessed the natural decomposition of aged MPs across different water matrices and their sorption behavior toward hydrophobic and hydrophilic micropollutants in mixed wastewater. This research aims to provide critical insights into MPs' transformations during UV-based treatments, informing strategies for mitigating MP pollution while minimizing associated environmental risks.
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Researchers investigated whether microplastics in water could interfere with UV-LED disinfection, a common method used to kill viruses in drinking water. They found that PVC microplastics can shield viruses from UV light, reducing disinfection effectiveness, especially at higher microplastic concentrations and under certain water chemistry conditions. The findings suggest that microplastic contamination in water sources may compromise the safety of UV-based water treatment.
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Researchers found that both UV irradiation and chlorination used in drinking water treatment alter the surface properties, size distribution, and chemical composition of microplastics, with combined treatments producing greater modifications and potentially increasing the release of plastic additives and adsorbed contaminants.
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Researchers examined how UV light exposure changes the properties of thermoplastic polyurethane microplastics in water and whether those changes affect the formation of harmful disinfection byproducts during water chlorination. They found that UV exposure broke the plastic into smaller fragments and released soluble chemicals that significantly increased byproduct formation after chlorination. The findings suggest that aging microplastics in water systems could contribute to the creation of potentially harmful chemicals during standard water treatment.
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Researchers studied how dissolved organic matter released from microplastics transforms under UV light and how it contributes to the formation of harmful disinfection byproducts during water chlorination. They found that UV exposure changed the chemical composition of the microplastic-derived organic matter, affecting its reactivity during disinfection. The findings suggest that microplastics in water sources may indirectly increase the formation of potentially harmful chemicals during standard water treatment.
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Scientists investigated what happens to polyurethane microplastics during water chlorination, a standard step in water treatment. They found that chlorination breaks down the plastic surface and releases organic chemicals, especially from UV-weathered particles, which produced significantly more leached compounds. The findings suggest that water treatment processes themselves may inadvertently release harmful byproducts from microplastics.
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