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Modeling the Fate of Nano- and Microplastics in freshwater systems
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Researchers developed a spatially and temporally explicit fate model for nano-, micro-, and millimeter-scale polymer particles in the river Dommel, finding that particle size, biofilm formation, and water turbulence are the dominant controls on retention and downstream transport, with larger particles and biofouled surfaces settling preferentially in specific riverine hot spots.
Riverine transport from land based sources constitutes an important pathway of plastic particles to the marine environment. However, fate and transport models for nano-, micro- and millimetre (NMM) sized particles are lacking. Prognostic fate models can be used to assess retention in freshwaters, to assess exposure to aquatic organisms and to quantify transport to sea. Here, we present a novel model for NMM polymer particles implemented for the river Dommel. The spatially and temporally explicit model accounts for advective transport, homo- and hetero-aggregation, sedimentation-resuspension, polymer degradation and burial. Experimental data on particle behaviour as well as literature data are used to parameterize the model. Model behaviour was tested by varying particle radius from 30 nm to 5 mm, for two polystyrene emission scenarios; a point source scenario and a realistic scenario with a combination of diffuse and WWTP (waste water treatment plant) sources. It appears that particle size, biofilm formation and water turbulence have dramatic effects on the fate and retention of NMM sized polymer particles in the Dommel catchment and on the positioning of the accumulation hot spots along the river.
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Researchers reviewed how microplastics move, accumulate, and interact with ecosystems in freshwater environments like rivers and lakes, which serve as both major pathways and sinks for plastic pollution. Understanding this behavior is critical because freshwater sources supply drinking water for billions of people worldwide.
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Numerical models can simulate how microplastics move through coastal environments by integrating hydrodynamic, biological, and atmospheric processes, helping predict accumulation hotspots and exposure zones. These modeling tools are vital for guiding cleanup efforts and assessing risks to coastal communities and marine food sources.
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Sampling, detecting, and characterizing micro- and nanoplastics in natural water bodies presents significant technical challenges that limit our understanding of their environmental hazards. Improved standardized methods for measuring these particles are critical to accurately assessing contamination levels and human exposure risks.
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Researchers reviewed the sources, environmental fate, and toxicity of microplastics in freshwater ecosystems, finding that microplastics cause physical injury and histological damage to aquatic organisms and act as vectors amplifying the toxicity of co-occurring chemical pollutants.
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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.