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Hidden contaminants: Unveiling the content of microplastics in municipal sewage sludge that may affect soil ecosystems
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Researchers analyzed sewage sludge from two municipal treatment plants and found up to 116,000 microplastic particles per kilogram of dry sludge, with fiber-shaped and film-shaped particles dominating each plant respectively — highlighting the risk of spreading microplastic contamination to farmland when sludge is used as fertilizer.
This study quantifies the characterisation of microplastics present in sewage sludge from two different municipal wastewater treatment plants, focusing on their quantity, types, sizes, shapes and potential impact on soil ecosystems when sludge is used as a fertiliser. Advanced microscopic and spectroscopic techniques were employed to identify the physical and chemical properties of microplastics. The results demonstrated significant differences in microplastic characteristics between the analysed treatment plants. The average microplastic content was 13748 and 116307 particles per kilogram of dry sewage sludge. The first plant’s sludge was dominated by fibre-shaped microplastics with polyethylene terephthalate being the most common polymer. In contrast, the second plant exhibited a higher concentration of film-shape microplastics, with polyethylene as the dominant polymer. Both treatment plants are dominated by microplastics of smaller sizes (less than 1 mm). Literature suggests that these microplastics can increase the risk of bioaccumulation of harmful chemicals in the soil, potentially affecting soil and plant health. The study emphasizes the need for more research on the environmental impact of microplastics in sewage sludge and strategies to reduce their presence in wastewater. The findings could help inform new guidelines for the sustainable management of sewage sludge, reducing the environmental risks associated with microplastics contamination.
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An Overlooked Entry Pathway of Microplastics into Agricultural Soils from Application of Sludge-Based Fertilizers
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Researchers analyzed sludge-based fertilizers applied to agricultural soils and found high microplastic concentrations (hundreds to thousands per kilogram of dry weight) that were transferred to soils after application, identifying this as an important but overlooked pathway for terrestrial microplastic contamination.
Stabilized Sewage Sludge as Fertilizer: Risks Related to the Presence of Microplastics
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Researchers analyzed microplastic content in sewage sludge-derived fertilizer collected in June and July, finding an average of ~460 mg of microplastics per 100 g of fertilizer with fragments and fibers predominating — raising concerns about agricultural land contamination from sewage sludge application.
Biosolid amendments as drivers for microplastic pollution in soil: Measurements and insight from multiple analytical methods in an agricultural field study
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Scientists analyzed farm soil that had been treated with sewage sludge (a common fertilizer made from treated wastewater) years earlier, comparing it to untreated soil to identify tiny plastic particles left behind. This research provides detailed tools and data for detecting these microplastics, helping build the scientific groundwork needed to understand how farm fertilizing practices may contribute to plastic pollution in the food we grow.
Microplastics in Sludges and Soils: A Comprehensive Review on Distribution, Characteristics, and Effects
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This review summarizes research on microplastics in sewage sludge and soil, noting that when contaminated sludge is used as fertilizer, it turns farmland into a major reservoir for microplastic pollution. The accumulated microplastics can alter soil properties, harm soil organisms, and potentially enter crops and groundwater, creating pathways for human exposure through food and drinking water.
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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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.