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Effect of Ventilation Modes on Microplastic Flow During Perishable Waste Composting
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Researchers investigated how four ventilation methods affect microplastic distribution during perishable waste composting, finding that composting reduced extractable MPs in the solid product by 73–84%, with most MPs migrating to leachate and composting time being the strongest influencing factor. This matters because MP migration into leachate means contaminated liquid can carry plastics into soils and waterways if not properly managed during this widely used organic waste treatment process.
Composting biodegradable waste is a vital means of recycling its valuable resources. However, the detection of new pollutants, such as microplastics (MPs), urgent attention. This study investigated the effects of four different ventilation methods on the distribution of microplastics in the composting process of perishable waste. The results showed that in the composting process of perishable waste, the quality of compost was different due to ventilation, and the content of extractable microplastics in compost products decreased by 72.85–83.89%, the main destination is leachate. The inhomogeneous distribution of microplastics between the solid and liquid phases, and into the liquid phase, has been attributed to differentiated oxygen and temperature levels within the composting reactor. Remarkably, composting time had the most significant effect on microplastics, the impact contribution is 29.24–39.49%. Reasonably regulate compost ventilation conditions can enhance quality control measures while minimizing the release of microplastics during composting. This study updated the understanding of secondary pollution in the composting process of perishable waste from the perspective of new pollutant microplastics, which can provide a basis for the formation of targeted controllable strategies in the later stage.
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Microplastics in Composts, Digestates and Food Wastes: A Review
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Researchers reviewed microplastic contamination in composts, digestates, and food wastes, finding that plastic packaging mixed into food waste streams may inadvertently introduce microplastics into agricultural soils during composting or anaerobic digestion. The authors highlight critical research gaps and call for harmonized methods to better assess this potential pathway of soil microplastic contamination.
Microplastics in MSW-derived compost: release rate, characteristics, ecological risks, and mitigation strategies for sustainable agriculture
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Compost made from household trash often contains tiny plastic bits called microplastics, and surprisingly, the compost from industrial facilities had even more plastic contamination than the raw waste it started from. Since this compost gets spread on farm fields, these plastic fragments can build up in the soil where our food grows. The good news: simply sorting out plastic from food/organic waste before composting (rather than mixing everything together) dramatically cuts down on this contamination, suggesting better recycling habits at home and in waste facilities could help keep microplastics out of our agricultural system.
Influence of Polyethylene Terephthalate and Polystyrene Microplastics on Microbial Dynamics in Rice Straw Composting
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Researchers found that PET and polystyrene microplastics added to rice straw composting at 0.5% dry weight reduced microbial diversity by 12%, lowered nitrate levels by up to 33%, cut germination indices by roughly 50%, and slowed organic matter humification, while the plastics themselves remained chemically intact after 90 days.
The Efficiency of Different Digestion and Separation Methods for Extracting Microplastics in Typical Organic Solid Waste
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This study compared seven digestion protocols and three separation methods for extracting microplastics from organic solid waste such as compost and biogas residues, identifying 30% hydrogen peroxide digestion followed by two-stage density separation as optimal with over 86% recovery. Standardized extraction methods are critical for generating comparable data on microplastic contamination in agricultural inputs that ultimately transfer plastic particles into soils.
Microplastic Pollution in Compost Derived from Mixed Municipal Waste in Kermanshah City: Abundance, Characteristics, and Ecological Risk Evaluation
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Researchers found that compost made from mixed municipal solid waste in Kermanshah, Iran, was universally contaminated with microplastics at an average of 2,160 particles per kilogram — translating to an estimated 118 million microplastics added to each hectare of farmland annually — posing medium to high ecological risk and highlighting compost as a significant pathway for microplastic entry into agricultural soils.
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