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Response mechanism of sludge anaerobic fermentation on polyethylene terephthalate microplastic (PET-MPs) particle sizes
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Researchers found that microplastics introduced during wastewater treatment are transferred into sewage sludge and survive the anaerobic digestion process, meaning they remain present when sludge is applied to agricultural land. This pathway represents a significant and underappreciated route for microplastic pollution to enter terrestrial ecosystems.
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Researchers examined how polyethylene terephthalate (PET) microplastics of different particle sizes and physical aging states affect anaerobic digestion of municipal wastewater treatment sludge, conducting comparative experiments to elucidate the impact mechanisms. They found that PET microplastics accumulated in sludge alter the digestion process, with particle size influencing the degree of disruption to microbial activity and biogas production.
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