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Sewage Sludge in Farmlands: A Gateway to Soil Microplastic Pollution?
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Researchers analysed microplastic contamination in dewatered anaerobically digested sewage sludge and adjacent agricultural fields in the UK with varied sludge application histories, using fluorescence microscopy and FTIR/Raman spectroscopy to detect predominantly polyethylene, polyester, polypropylene, polystyrene, PVC, and polyamide particles.
This study examines the accumulation of microplastics in agricultural soils, an emerging concern linked to the widespread application of sewage sludge. In the UK, 87% of sludge is disposed of through this route. To investigate this potential pathway for microplastic transfer to soils, we analysed dewatered-anaerobically digested sludge from a local wastewater treatment plant and adjacent fields with varied sludge usage histories, including control fields with no sludge application.Utilising fluorescent microscopy, Fourier-transformed infrared and Raman micro-spectroscopies, we detected significant microplastic presence in sludge samples (2900 ± 1400 particles/g DW and 1200 ± 400 fibres/g DW), predominantly polyethene, polyester, polypropylene, polystyrene, polyvinyl chloride and polyamide, sized between 20-500 µm. Preliminary results revealed elevated microplastic levels in fields that ceased sludge usage a decade ago in the topsoil (62 ± 33 particles/g DW), compared to control fields (8 ± 4 particles/g DW), with pronounced weathering effects on the surfaces of the microplastics.The study also discusses differences in microplastic concentrations detected by different analytical methods and is one of the first to investigate microplastic retention in soil after sludge disposal as dependent on soil characteristics. These insights into microplastic fate in soil post-sludge disposal are crucial for enhancing environmental risk assessments and supporting the development of evidence-based policy revisions for sustainable land management.
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Microplastics in an agricultural soil following repeated application of three types of sewage sludge: A field study
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Researchers investigated microplastics in agricultural soil after repeated sewage sludge application, finding that sludge-amended soils contained significantly more small microplastic particles than unamended soils, with particle accumulation varying by sludge type.
Evidence of microplastic accumulation in agricultural soils from sewage sludge disposal
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Agricultural soils from 31 fields with different sludge application histories were analyzed for microplastics, finding significant accumulation in fields with repeated sludge applications and a positive correlation between application frequency and plastic particle counts. The study provides direct field evidence that sewage sludge fertilization is a major pathway for microplastic accumulation in agricultural soil.
Microplastics in an anaerobic digester treating sewage sludge: Occurrence and factors affecting their identification with Raman spectroscopy
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Researchers tracked microplastic levels through an anaerobic digester used to treat sewage sludge and its subsequent separation into solid and liquid fractions. They found that the digestion process stabilized the fluctuating microplastic concentrations found in raw sludge, and that the vast majority of particles ended up in the solid fraction. Since this solid material is often applied to farmland, the findings raise concerns about sewage-derived microplastics entering agricultural soils.
Microplastic Pollution in Sewage Sludge from Wastewater Treatment Plants and Estimation of Microplastic Release
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Researchers analyzed microplastic contamination in sewage sludge from wastewater treatment plants using infrared spectroscopy and estimated the quantities released into the environment when sludge is used for soil improvement. They found significant microplastic concentrations in the sludge samples, with the majority being fiber-shaped particles. The study highlights that the growing practice of applying sewage sludge to agricultural land is a meaningful pathway for microplastic transfer to soil environments.
Sewage sludge application as a vehicle for microplastics in eastern Spanish agricultural soils
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Scientists measured microplastics in sewage sludge from Spanish wastewater treatment plants and in agricultural soils receiving sludge applications, finding that sludge application transferred hundreds to thousands of microplastic particles per kilogram into agricultural soil.
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