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Microplastics (MPs) in wastewater treatment plants sludges: Substrates, digestive properties, microbial communities, mechanisms, and treatments
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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.
Microplastics in Wastewater Treatment Plants: Occurrence, Fate and Mitigation Strategies
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Wastewater treatment plants (WWTPs) are major conduits for microplastics into the environment, yet even advanced treatment systems fail to fully remove the smallest particles before discharge. Understanding microplastic fate across treatment stages is essential for developing targeted mitigation strategies that reduce the tonnage of plastic particles entering rivers, soils, and ultimately the food supply.
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Researchers reviewed microbial technologies — including bacterial degradation, fungal breakdown, and enzymatic pathways — capable of fragmenting and mineralizing microplastic polymers in wastewater treatment systems. These biological approaches offer a sustainable, low-cost route to eliminating microplastics before they accumulate in aquatic ecosystems and enter the food chain.
Fate of Microplastics in Wastewater Treatment Plants
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This book examines how microplastics move through wastewater treatment systems, covering sources, treatment technologies, system-specific factors, and future challenges for improving removal efficiency. Understanding the fate of microplastics in wastewater infrastructure is critical because treatment plants simultaneously serve as a primary barrier against and a significant ongoing source of microplastic discharge into aquatic environments.
Occurrence and migration of microplastics and plasticizers in different wastewater and sludge treatment units in municipal wastewater treatment plant
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A systematic study of a municipal wastewater treatment plant found that while 98% of incoming microplastics were removed from effluent water, 74% accumulated in the sludge—which is often land-applied—and phthalate plasticizers co-occurred throughout the treatment process. These findings reveal that standard wastewater treatment does not eliminate microplastics or associated chemical pollutants but instead concentrates them in biosolids that re-enter agricultural soils.
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