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The interaction of microplastic and heavy metal in bioretention cell: Contributions of water-soil-plant system
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Researchers investigated how polyethylene microplastics interact with heavy metals in bioretention cells designed to treat stormwater runoff. They found that microplastics bind to heavy metals and influence their movement through the water-soil-plant system, affecting overall pollutant removal efficiency. The study provides important insights into how the co-presence of microplastics and metals in urban runoff complicates green infrastructure performance.
The effectiveness of bioretention cells for heavy metals (HMs) and microplastics (MPs) removal from stormwater runoff has been demonstrated. Knowledge of the mechanisms that dictate the interactions between MPs and HMs would be helpful in pollution control. In this study, the performances of different water-soil-plant bioretention cells for HMs removal through the interception of polyethylene MPs (PE-MPs) were investigated. The results showed that PE-MPs bound to HMs and preferentially tended to bind to Pb (32%-44%) in the complex HMs (Cu, Zn, Cd, and Pb). This could be the reason that the concentration of Pb significantly increased in the effluent under low-intensity simulated rainfall events over a long duration. The accumulation of 1.49 g/kg PE-MPs caused a significant soil pH value decrease and a notable soil zeta potential increase in the bioretention cell, while the low sand/silt ratio media buffered this process. The retention of PE-MPs increased 138.5% in the 0-10 cm soil surface layer when the sand/silt ratio reduced from 2:1 to 1:1 and planted with Canna indica. Meanwhile, PE-MPs amplified the instability of Zn removal in bioretention cells under low-intensity rainfall events in long-duration, high silt percentage substrate and vegetation coverage. The study would contribute to developing a long-term management program for PE-MPs and HMs trapped in bioretention cells to reduce the risk of pollution transport.
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Plastic pollution risks in bioretention systems: a case study
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Researchers investigated plastic pollution in urban stormwater bioretention systems and found these green infrastructure features both accumulate microplastics from road runoff and risk leaching plastic particles into groundwater, raising concerns about their role as pollution pathways.
[Removal Mechanism of Microplastics in Bioretention Systems and the Influence of Their Enrichment on the Treatment of Pollutants in the System].
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Researchers reviewed how bioretention systems, a low-impact stormwater management strategy, can remove microplastics from urban runoff through adsorption, filtration, and biodegradation. However, because microplastics resist degradation and have large surface areas, they tend to accumulate in these systems over time, forming composite pollution with other contaminants. The study found that microplastic accumulation altered soil properties, impeded plant growth, and reduced the system's ability to remove nutrients, particularly dissolved nitrogen.
Field assessment of engineered bioretention as microplastics sink through site characterization and hydrologic modeling
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A field study of bioretention cells — garden-like stormwater filters used in green infrastructure — found that their soils contained 7 to 10 times more microplastics than background soils, with polypropylene and polyethylene dominating. This confirms that bioretention systems are effective at capturing microplastics from urban runoff, but it also raises questions about what happens to the accumulated plastic over time and whether it eventually leaches back into groundwater.
Occurrence and Pathways of Microplastics in Bioretention Filters
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Researchers found eleven microplastic polymer types in bioretention filter soil and stormwater samples in an urban setting, characterizing the occurrence and pathways of microplastics entering these green infrastructure systems from contaminated impervious surface runoff.
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.
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