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Seasonal variation in microplastic abundance, morphology, polymers, and adsorbed contaminants in wastewater treatment sludges and biosolids
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Scientists found that wastewater treatment plants release more microplastics, especially tiny tire and road particles, during spring snowmelt. These plastic bits often carried drugs, chemicals, and other pollutants on their surface. Since treated sludge is sometimes used as fertilizer on farmland, this raises questions about how these contaminants might spread into soil, water, and eventually our food.
This study investigated the seasonal impact on microplastic (MP) characteristics and concentration in the sludge streams (primary, secondary (waste activated) and digested) at a municipal wastewater treatment plant (WWTP) in Ontario. MPs were recovered after digestion and density separation of primary, secondary and digested sludge samples and were quantified and characterized (shape, colour, polymer type, and chemical contaminants) using microscopy and FTIR. The primary sludge had the highest number of MP particles among the three sludges, regardless of the season. The results show that sludge samples collected during the spring season had the highest MP concentrations (1.5–2.5 times higher), along with increased levels of tire and road wear particles (TRWPs), attributed to snowmelt and stormwater. Black and blue were the frequently recorded MP colours, with no discernible seasonal trends among different sludge types. Fibres remained the predominant MP type irrespective of the season and the sludge type. FTIR analysis of the 20–30% subset of MPs also revealed that PET was the most common polymer, with significant amounts of PA, PE, and PP recorded. There were no significant seasonal changes in the polymer type of the MPs. The spectral analysis further revealed the presence of a range of pharmaceutical drugs, industrial chemicals, and emerging contaminants on MPs, often obscuring the polymer identification while highlighting the role of MPs as carriers of environmental contaminants. Seasonal dynamics play a crucial role in assessing the emission of MPs into aquatic and terrestrial ecosystems. Understanding these fluctuations enables the development of more targeted and effective intervention strategies that are responsive to periods of heightened risk and that mitigate their environmental impacts.
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Microplastics in Wastewater Treatment Plant Sludges: Detection Methods, Seasonal Variation, and Effects on Anaerobic Digestion
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Scientists found that microplastic pollution in wastewater treatment plants spikes in spring, likely from snowmelt and runoff, and these plastics often carry other contaminants along with them. The study also found that tiny plastic fibers can disrupt the treatment process itself, while plastic fragments actually boosted it, showing that shape and type matter for how we manage this pollution before it reaches our environment.
Seasonal Variation, Distribution and Characteristics of Microplastic in Sewage Sludge
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Researchers investigated seasonal variation in microplastic concentration, distribution, and characteristics within sewage sludge at wastewater treatment plants, examining how precipitation patterns and sludge treatment processes influence microplastic retention and the pathways by which sludge-borne microplastics enter agricultural soils upon land application.
Characterization of Microplastics in Natural and Wastewater, and Their Influence and Removal in Biological Treatment Processes
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Scientists studied how tiny plastic particles called microplastics move through wastewater treatment plants and found that most of them end up trapped in the leftover sludge rather than in the treated water. This matters because that sludge is often used as fertilizer on farmland, meaning these plastics could be entering our soil, crops, and potentially our food supply. The researchers also developed better methods for detecting microplastics in messy samples like sludge, which is an important step toward understanding just how widespread this contamination really is.
Tracing the fate of microplastic in wastewater treatment plant: A multi-stage analysis of treatment units and sludge
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Researchers tracked microplastics through every stage of a wastewater treatment plant and found that while treatment removes many particles from the water, most end up concentrated in the leftover sludge. Fibers and fragments were the most common shapes, made primarily of polyester and polyethylene. Since treated sludge is often spread on farmland, this creates a pathway for microplastics to enter soil and potentially the food chain.
Microplastics and synthetic fibers in treated wastewater and sludge
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Researchers measured microplastics and synthetic fibers in both the treated effluent and sludge from a wastewater treatment plant, finding that while effluent concentrations were relatively low, sludge had very high microplastic concentrations. When sludge is applied to agricultural fields as fertilizer, it can deliver large quantities of microplastics directly to soils.
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