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Microplastics in solid waste streams: Research needs and gaps in research methodology
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This paper reviewed methodological gaps and research needs in detecting microplastics specifically within solid municipal waste streams, arguing that current methods developed for liquid waste cannot be directly applied to solid waste and that standardized approaches are urgently needed.
Over the last decade, the presence of microplastics in municipal waste streams has become increasingly recognized as a significant environmental issue. While most studies have focused on liquid waste, specifically wastewater treatment plants, as a primary source of microplastic contamination, emerging research has begun to highlight solid waste systems. This review evaluates forty-six peer-reviewed studies reporting microplastic concentrations in landfill leachate, digestate from anaerobic digesters, composting facilities, and recycling operations. The concentrations of microplastics in these systems remain sparsely explored, and among available studies, methodological inconsistencies limit reproducibility and synthesis. The inconsistencies identified in this review included omitting essential sample processing steps, minimal reporting of detection limits for analytical instruments, and limited documentation of tactics for reducing inevitable laboratory contamination. These gaps highlight the importance of developing standardized methodologies and transparent reporting practices that account for sampling design, analytical sensitivities, and contamination control. This review synthesizes recent methodological trends, identifies key information to report, and proposes foundational elements for a more unified approach to microplastic analysis in solid waste streams.
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Researchers evaluated five different extraction protocols for isolating and quantifying microplastics in the fine fraction of municipal solid waste, addressing the lack of standardized methodologies for this underexamined waste stream. The study identified the most effective extraction method and provided a replicable protocol applicable to urban waste management contexts, where fine waste fractions may contribute significantly to environmental microplastic release.
Results of VAMAS Survey Regarding Microplastic Issues
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This paper presents results of an international VAMAS survey identifying key measurement and standardization challenges in microplastic research. It highlights the urgent need for internationally agreed methods to detect, characterize, and quantify microplastics consistently across different environmental matrices.
Microplastic contamination and accumulation in municipal solid waste: A global review of sources, pathways, and impacts
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This global review examines microplastic contamination in municipal solid waste, covering sources from landfills, sewage sludge, compost, and food waste, and how plastic particles from these land-based waste streams enter soil, groundwater, and eventually the food chain.
Methodologies for Microplastics Recovery and Identification in Heterogeneous Solid Matrices: A Review
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Researchers reviewed existing methods for extracting and identifying microplastics from solid environmental matrices such as soil, compost, sediment, and sludge, highlighting the lack of a standardized protocol as a key barrier to progress. Without consistent methodology, it is difficult to compare findings across studies or to set informed regulatory limits for microplastics in agricultural soils.
Microplastics as an underestimated emerging contaminant in solid organic waste and their biological products: Occurrence, fate and ecological risks
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This review identified solid organic waste streams including compost, sewage sludge, and food waste as important but underappreciated repositories of microplastics that can reintroduce particles into agricultural soils and water systems. The authors call for standardized monitoring of microplastics in organic waste before environmental application.
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.