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The dynamics of macro- and microplastic quantity and size changes during the composting process
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Researchers tracked microplastic generation during composting at two Austrian facilities, finding that microplastics appear after the first turning event and increase throughout the process, with shorter turning intervals accelerating fragmentation rates.
The quantity and type of macro- and microplastics was investigated in rotting material during the composting process of two state-of-the-art composting plants in Austria. Microplastics >0.2 mm, were found already after the first turning event in both facilities. The generation of microplastics was more extensive in the plant that used shorter turning intervals during the first four weeks and generated approx. 21 particles per week and kg-1 DM. After 4 weeks of operation less microplastic particles were detected, which suggested that particles were fractionated to smaller sizes during processing. In addition, a total of nine composts from three different facilities that were operated in various settlement structures were compared. 7 to 232 macro- and microplastic particles per kg DM were found, whereas the highest plastic burden was observed in the composts made from biowaste that originated from the most densely populated area.
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Fate and dynamics of microplastics in the municipal waste composting process
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Researchers tracked microplastic abundance and polymer composition across five consecutive composting stages of municipal waste at the Galuga landfill in Indonesia, finding stage-specific changes including process-based reduction and fragmentation dynamics that highlight both the capacity and limitations of composting for mitigating microplastic contamination.
Plastic input and dynamics in industrial composting
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Researchers quantified plastic input and dynamics at five stages of an industrial composting process, tracking macroplastics in municipal bio-waste collections from different municipalities (0.36-4.72 kg/ton, dominated by PE and PP) and measuring microplastic concentrations through shredding and screening to assess removal or enrichment.
Microplastics generation and concentration during mechanical-biological treatment of mixed municipal solid waste
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Researchers found that mechanical-biological treatment of mixed municipal solid waste generates and concentrates microplastics across multiple processing stages, with the stabilized organic output containing significant microplastic loads — raising concerns about the use of this material as compost or soil amendment.
Microplastics identification and quantification in the composted Organic Fraction of Municipal Solid Waste
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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 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.
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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.