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A new protocol to assess the microplastics in sewage sludge
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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.
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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.
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Wastewater and sludge samples require careful pretreatment to remove organic matter and other interfering materials before microplastic analysis can yield accurate results, and the choice of pretreatment method significantly affects particle recovery and identification. Standardizing pretreatment protocols is critical because wastewater treatment plants are major pathways through which microplastics reach both aquatic environments and agricultural soils via sludge application.
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Researchers synthesized 51 studies on microplastics in wastewater biosolids, finding a median of 14,900 microplastic particles per dry kilogram of biosolids applied to land, with polyester and polyamide fibers among the most abundant polymer types detected.
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