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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.
Permeable pavement systems (PPS) designed to store stormwater and facilitate its drainage into pipeline networks also provide the added advantage of retaining particulate pollutants in the stormwater runoff. Among these pollutants, microplastics (MPs), are increasingly being detected in the atmosphere and can be deposited in the environment via rainfall. Consequently, mitigating the transport of airborne MPs through rainfall is crucial for preventing water and soil contamination, thereby reducing the potential risks to human health and ecosystems. To achieve effective pollution control, an experimental study was conducted to assess MPs removal efficiencies and permeability performance of various permeable pavement blocks. The pore structure, which is a critical factor influencing permeability, was analyzed using porosity measurements and X-ray computed tomography imaging. Additionally, computational fluid dynamics (CFD) simulations were utilized to investigate the MPs removal mechanisms within the PPS, modeling the flow of MPs through blocks with distinct pore structures and varying permeability levels. Notably, Block A, with the highest permeability (1.7 mm/s), achieved removal efficiencies exceeding 90 % for polyethylene (PE) and polyethylene terephthalate (PET). CFD analysis revealed that low-density PE particles were retained more effectively, while high-density PET particles displayed greater mobility through the pavement blocks. Furthermore, as rainfall intensity increased, the removal efficiencies of PE and PET gradually decreased. This study highlights the critical role of material design and CFD-optimised pore structures in enhancing the efficacy of permeable pavement systems for urban stormwater management. By elucidating the MPs removal mechanisms driven by distinct transport behaviors of PE and PET particles based on density differences, these systems offer a promising solution for mitigating urban stormwater contamination and advancing sustainable water resource management.
More Papers Like This
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.
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.
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.
Análisis del comportamiento hidráulico y ambiental a largo plazo de pavimentos permeables y de su potencial para el control de microplásticos en la gestión avanzada de escorrentías urbanas
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Researchers investigated the long-term hydraulic and environmental performance of permeable pavements for controlling microplastics in urban stormwater runoff, demonstrating their potential to prevent suspended solids and associated microplastic particles from reaching the environment.
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.
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