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Removal and fate of microplastics in permeable pavements: An experimental layer-by-layer analysis
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Researchers tested permeable pavements as a way to capture microplastics from urban stormwater runoff and found they retained 89% to over 99% of microplastic particles. The microplastics accumulated mainly on the pavement surface and in geotextile filter layers, preventing them from reaching natural waterways. This type of sustainable urban drainage could be an effective tool for reducing the amount of microplastics that wash off roads and into the water sources people depend on.
The increasing prevalence of microplastics (MP) in urban environments has raised concerns over their negative effects on ecosystems and human health. Stormwater runoff, and road dust and sediment, act as major vectors of these pollutants into natural water bodies. Sustainable urban drainage systems, such as permeable pavements, are considered as potential tools to retain particulate pollutants. This research evaluates at laboratory scale the efficiency of permeable interlocking concrete pavements (PICP) and porous concrete pavements (PCP) for controlling microplastics, including tire wear particles (TWP) which constitute a large fraction of microplastics in urban environments, simulating surface pollution accumulation and Mediterranean rainfall conditions. Microplastic levels in road dust and sediments and stormwater runoff inputs were 4762 ± 974 MP/kg (dry weight) and 23.90 ± 17.40 MP/L. In infiltrated effluents, microplastic levels ranged from 2.20 ± 0.61 to 5.17 ± 1.05 MP/L; while tire wear particle levels ranged between 0.28 ± 0.28 and 3.30 ± 0.89 TWP/L. Distribution of microplastics within the layers of PICP and PCP were also studied and quantified. Microplastics tend to accumulate on the pavements surface and in geotextile layers, allowing microplastic retention efficiencies from 89 % to 99.6 %. Small sized (< 0.1 mm) fragment shaped microplastics are the most common in effluent samples. The results indicate that permeable pavements are a powerful tool to capture microplastics and tire wear particles, especially by surface and geotextile layers. The study aims to shed light on the complex mobilisation mechanisms of microplastics, providing valuable insights for addressing the growing environmental concern of microplastic pollution in urban areas.
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Permeable pavement blocks as a sustainable solution for managing microplastic pollution in urban stormwater
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Researchers tested whether permeable pavement, the kind of pavement that lets water drain through it, can filter out microplastics from urban stormwater runoff. They found it can trap microplastic particles effectively, suggesting permeable pavement could be a practical tool for reducing the amount of microplastics that wash into rivers and oceans from city streets.
Interception of urban surface source waste plastics by typical permeable paving materials
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When it rains, plastic litter on city streets often washes into rivers and oceans, where it breaks down into microplastics that can end up in our water and food. This study found that special "permeable" pavement materials, designed to let rainwater soak through instead of running off, can trap over 90% of that plastic debris right at the surface, as long as streets get cleaned regularly. Using these materials in city planning could be a simple but powerful way to cut off plastic pollution before it ever reaches our waterways.
Eficiencia de los pavimentos permeables para la retención de microplásticos de la escorrentía urbana
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Researchers evaluated the effectiveness of permeable pavements as sustainable urban drainage systems for retaining microplastics from urban stormwater runoff, testing their performance under controlled laboratory conditions calibrated to average rainfall patterns in Valencia, Spain. Results showed a significant reduction in microplastic particle counts in water passing through the permeable pavement layers.
Permeable pavement systems for microplastic mitigation: Critical insights on transport, retention, detection and removal efficiency
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This review of 28 studies finds that special "permeable pavements" — designed to let rainwater soak through instead of running off streets into rivers — can trap 89-99% of tiny plastic particles (microplastics) in the short term, which matters because these particles wash off roads and eventually make their way into waterways, soil, and potentially our food and water supply. However, scientists still don't know if these pavements keep working well over years of use, or whether the trapped plastic particles could eventually break free again, so more long-term testing is needed before we can call this a lasting solution.
Permeable pavements: A possible sink for tyre wear particles and other microplastics?
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Researchers sampled approximately 100 kg of particulate material from seven roads and parking lots to analyze microplastic content including tire wear particles. The study found that tire wear constituted the dominant fraction of microplastics at 0.09% of dry mass, with polypropylene as the most common non-tire plastic type, and that permeable pavements may act as sinks trapping these particles before they reach waterways.
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