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Progressive exploration of the four municipal solid composting phases for microplastics pollution: Extraction, abundance, and distribution
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Researchers tracked microplastic abundance and size distribution through all four stages of municipal solid waste composting at a Canadian facility. They found that zinc chloride density separation achieved approximately 99.9% extraction recovery, significantly outperforming calcium chloride. The study reveals that compost used to enrich agricultural soils can be a meaningful pathway for introducing microplastic contamination into farmland.
Research on microplastic (MP) pollution in agriculture is limited, particularly concerning municipal solid waste (MSW) compost, which is commonly used to enhance soil quality but can introduce MPs into agricultural systems. This study evaluates the density separation efficiency of ZnCl₂ and CaCl₂ in both spiked and non-spiked compost. It also tracks MP abundance and size distribution throughout the composting stages-mesophilic, thermophilic, curing, and mature-at a Canadian facility. The research employs a combination of three extraction methods: wet-sieving, organic digestion, and density separation. Results indicate that ZnCl₂ yields an extraction recovery of ∼99.9 % in spiked tests, outperforming CaCl₂, which achieves about 95 %. In the non-spiked study, ZnCl₂ recovered 242 MP particles/kg of wet compost compared to CaCl₂, which extracted 138 MP particles. Moreover, MP abundance increased throughout the composting process, demonstrating a linear relationship between MP size and abundance. Characterization via ATR-FTIR spectroscopy revealed that polyethene, polypropylene, and polystyrene were the most common MPs, while polyurethane, polyvinyl chloride, and cigarette filters were less prevalent. These findings underscore the need to improve MP management in organic composting, given its potential impact on plant health. Additionally, it enables a more focused approach to MP studies in compost, with an effective, affordable extraction protocol.
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Researchers quantified microplastics in composted organic municipal solid waste from five facilities, finding contamination levels that raise concerns about compost quality and the potential transfer of microplastics to agricultural soils through organic waste recycling.
Microplastics in compost from municipal solid waste. Assessment of their presence in the products generated with different industrial strategies.
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Microplastics were detected in compost made from municipal solid waste processed using different industrial strategies, raising concerns about the use of compost as a soil amendment. The presence of microplastics in compost could transfer plastic contamination directly to agricultural soils when compost is applied as fertilizer. The findings suggest that composting facilities need better plastic removal processes to prevent microplastic spread through the circular economy.
Extraction and Identification of a Wide Range of Microplastic Polymers in Soil and Compost
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Researchers compared and optimized two microplastic extraction methods for soil and compost, finding that density separation combined with chemical digestion was effective across a wide range of polymer types, providing a more reliable protocol for terrestrial microplastic analysis.
Plastics and other extraneous matter in municipal solid waste compost: A systematic review of sources, occurrence, implications, and fate in amended soils
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Researchers reviewed contamination in municipal compost made from household organic waste, finding plastics are the most prevalent pollutant — with some batches containing enough plastic to deposit over 500 kg per hectare of farmland each year. Repeated use of contaminated compost builds up microplastics in soil, threatening soil health and potentially moving plastic particles into crops and food.
A systematic review of the occurrence of microplastics in compost: Understanding the abundance, sources, characteristics and ecological risk
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Researchers reviewed 19 global studies and found microplastics in virtually all types of compost — including those made from animal manure, sewage sludge, and municipal waste — with concentrations reaching up to 288,000 particles per kilogram in some samples. Since compost is widely applied to farmland, these findings highlight a significant but overlooked pathway for microplastics to enter soils and the food chain.
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