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Microplastics removal from stormwater runoff by bioretention cells: A review
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This review examines the potential of bioretention cells, a type of green infrastructure, to remove microplastics from stormwater runoff. Researchers analyzed how these systems filter microplastics through soil media and vegetation and identified the key design parameters that affect removal efficiency. The study suggests that bioretention cells offer a promising nature-based solution for reducing microplastic loads entering waterways from urban areas.
Microplastics (MPs), as a new category of environmental pollutant, have been the hotspot of eco-friendly issues nowadays. Studies based on the aging process, the migration pattern of MPs in runoff rainwater, and the use of bioretention cells to remove MPs from runoff rainwater are beginning to attract widespread attention. This review analyses the migration patterns of MPs in rainwater runoff through their sources, structure and characteristics. The mechanism of removing MPs from runoff stormwater, the purification efficiency of different fillers and their influencing factors, and the accumulation, fate, and aging of MPs in bioretention cells are described. Furthermore, the hazards of MP accumulation on the performance of bioretention cells are summarised. Future directions for removing MPs in bioretention cells are proposed: (1) research on MPs smaller than 100 µm; (2) influence of MPs aging process on bioretention cells; (3) exploration of more effective fillers to enhance their removal efficiency; (4) research on synergistic removal mechanism of MPs and other pollution.
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Bioretention cells remove increasingly small microplastics from stormwater
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This study examined the ability of bioretention cells (engineered stormwater filtration systems) to remove microplastics of increasingly small sizes from runoff. The findings suggest these green infrastructure systems can capture microplastics across size ranges, contributing to their removal before stormwater enters natural water bodies.
Microplastics: The Occurrence in Stormwater Runoff and the Effectiveness of Bioretention Systems for Removal
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Researchers measured microplastic concentrations in stormwater runoff and tested the removal efficiency of bioretention systems including green roofs, bioswales, and bioretention cells, finding that these green infrastructure systems can significantly reduce microplastic loads before they reach surface waters. The study provides baseline data on stormwater as a microplastic transport pathway and evaluates a nature-based treatment solution.
Bioretention cells remove microplastics in the 25 – 106 micron size fraction
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This study found that bioretention cells (green infrastructure stormwater filters) effectively remove microplastics in the 25 to 106 micron size range from stormwater runoff. Bioretention cells represent a promising green infrastructure approach for intercepting microplastics before they reach streams and rivers.
Improving stormwater quality for microplastic (25 – 106 µm) using a bioretention cell
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This study evaluated how a bioretention cell (a vegetated stormwater filter system) removes small microplastic particles from stormwater runoff. Bioretention systems show promise as low-cost, nature-based approaches to capturing microplastics before they enter streams and drinking water supplies.
Small-Size Microplastics in Urban Stormwater Runoff are Efficiently Trapped in a Bioretention Cell
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Researchers conducted a two-year field study showing that bioretention cells, a type of green stormwater infrastructure, effectively captured microplastics as small as 25 micrometers from urban runoff. The system retained over 80 percent of small microplastics, with fibers and fragments being the most commonly trapped types. The findings suggest that existing urban green infrastructure can serve double duty as a practical tool for reducing microplastic pollution in waterways.
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