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Aging of polyester microplastics in sewer systems: Crucial role of sulfides
AI summary
Researchers investigated how polyester microplastics age inside sewer systems, finding that sulfide — a common compound in anaerobic sewers — is the primary driver of degradation in PET and PBAT particles. Sulfide-induced oxidation increased surface hydrophilicity and carbonyl content, promoted leaching of dissolved organic matter, and generated up to 10 nanoplastics per milliliter, highlighting significant ecological risks from microplastic transformation in urban drainage infrastructure.
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Micro-Nano-Plastics in Sewage Sludge: Sources, Occurrence, and Potential Environmental Risks
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Researchers reviewed how microplastics accumulate in sewage sludge — the byproduct of wastewater treatment — posing a significant environmental risk when sludge is applied to agricultural land. Because sludge is commonly used as fertilizer, microplastics from many sources can end up in soils and eventually in the food supply.
Current Progress of Microplastics in Sewage Sludge
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Researchers reviewed the presence of microplastics in sewage sludge, finding that while wastewater treatment plants capture most microplastics from water, the resulting sludge becomes a concentrated reservoir that can spread microplastics to agricultural soils when applied as fertilizer.
Occurrence, Fate, and Removal of Microplastics in Sewage Treatment Plants (STPs)
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Researchers reviewed how sewage treatment plants handle microplastics, finding that while these facilities remove a large fraction from wastewater, they also concentrate microplastics in sewage sludge that is then spread on agricultural land — potentially transferring plastic pollution from water to soil and food systems.
Stability of Microplastics: Detection of Potentially Harmful Compounds Produced by Microplastics During Accelerated Aging Studies
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Researchers investigate how microplastics change chemically during accelerated aging, detecting potentially harmful compounds released as plastics degrade, raising concerns about the additional toxicological risks posed by weathered microplastics beyond the particles themselves.
Replicating real-world microplastics with accelerated physicochemical ageing
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Researchers developed methods to artificially age microplastics in the lab so they accurately replicate the physicochemical properties of microplastics found in real-world environments. Environmentally realistic aged microplastics are essential for generating reliable toxicology data, since fresh plastic particles behave differently than weathered ones that organisms actually encounter.
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