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IMPASSE – Impacts of microplastic in agrosystems and stream environments
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This project report found that applying sewage sludge (biosolids) to farmland is a significant source of microplastics in agricultural soils, with soil contamination increasing with each successive biosolid application. The project emphasized that soil microplastic pollution is irreversible, making prevention more important than remediation.
We found that the application of biosolids from sewage sludge represents an important source of microplastics (MP) to agricultural soils. Soils that received more biosolid treatments in the past exhibit higher levels of MPs, demonstrating progressively increasing pollution. Soil organisms underpinning important ecological and agricultural functions interact with these MPs experiencing sublethal health effects at realistic environmental concentrations. Soil is a non-renewable resource and soil MP pollution is irreversible. To enable sustainable and circular use of sewage sludge, measures that prevent MPs accumulating in it, or that remove them prior to use are necessary.
More Papers Like This
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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Farms sometimes spread "biosolids" (treated sewage sludge) on fields as fertilizer, and this study measured microplastic particles in soil that had received these applications over a decade compared to untreated farmland. Using detailed chemical testing, researchers confirmed that soil treated with sludge contained identifiable plastic contamination, supporting concerns that this common farming practice can be a source of microplastics building up in agricultural land. Since these plastics can end up in the crops we eat and potentially in our food and water supply, understanding where they come from is an important step toward reducing our overall exposure.
The Role of Bioplastics and Sustainable Materials in Achieving Environmental Sustainability
AI summary
This study analyzed microplastic contamination in agricultural soils amended with sewage sludge biosolids. Results showed that sludge application significantly elevated soil microplastic concentrations, raising concerns about long-term accumulation and potential effects on soil organisms.
Investigation and analysis of microplastics in sewage sludge and biosolids: A case study from one wastewater treatment works in the UK
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Researchers investigated microplastic contamination in sewage sludge and biosolids at a UK wastewater treatment plant and found significant quantities of microplastics persisting through the treatment process. Since millions of tonnes of biosolids are applied to farmland annually in the UK, this represents a major pathway for microplastic pollution entering agricultural soils. The study highlights the need for better monitoring and treatment methods to reduce microplastic transfer from wastewater to the terrestrial environment.
Investigation and analysis of microplastics in sewage sludge and biosolids: A case study from one wastewater treatment works in the UK (article)
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This UK case study tracked microplastics through an entire sewage sludge treatment stream at one wastewater works, from raw influent through to biosolids applied to agricultural land. Microplastics were present at every stage and concentrated in biosolids, suggesting land application of biosolids is a significant pathway for introducing microplastics into agricultural soils.
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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.