We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Microplastics in Field-Installed Bioretention Systems: Vertical Distribution and Implications for Retention from Stormwater
AI summary Read the abstract
Researchers sampled microplastics at multiple depths inside a field-installed bioretention stormwater system and found average concentrations of roughly 1,095 particles per kilogram of dry sediment, with fragments dominating and evidence suggesting MPs migrate through the media, pointing to bioretention systems as a potentially useful but incompletely characterized filter for urban microplastic runoff.
Microplastics (MPs) are emerging pollutants of global concern, posing significant ecological and human health risks. They are frequently detected in stormwater systems, with urban runoff serving as a major transport pathway into the environment. Green stormwater infrastructure, particularly bioretention systems (BRSs), offers a promising approach to mitigate these risks by filtering and retaining various contaminants. However, the occurrence of MPs in BRSs and their capacity to retain these pollutants remain largely unexplored in the literature, despite being critical for stormwater management and water quality protection. Therefore, this study attempted to examine the occurrence, vertical distribution, and trapping of MPs within a field-installed BRS, potentially emphasizing their role in reducing microplastic (MP) transport. Therefore, field samples were collected at depths of 2, 12, and 24 inches below the surface and processed in the laboratory for MP detection and quantification. The results revealed an average concentration of 1095 particles per kg of dried sediment, with fragments (microplastics shape) accounting for 78.54% of the total MPs. Although no clear vertical distribution pattern was observed, the initial findings showed that MPs were mostly retained at 24 inches, potentially indicating their transport through the media and the retention capacity of a BRS (surface and middle layer) in capturing microplastics from stormwater environments. However, there is no direct evidence to explain the mechanisms driving the observed concentrations at greater depths. The preliminary findings of this study highlight that the concentrations of different sizes of MPs can vary with soil depth in bioretention media. Integrating a BRS into urban stormwater infrastructure likely provides the dual benefits of improved stormwater management and reduced plastic pollution. This study underscores the importance of optimizing bioretention design and media composition to enhance MP trapping from stormwater.
More Papers Like This
Abundance, distribution, and composition of microplastics in the filter media of nine aged stormwater bioretention systems
AI summary Read the abstract
Researchers analyzed microplastic abundance and distribution in the filter media of nine aged stormwater bioretention systems, finding that these green infrastructure installations accumulate significant microplastic loads, with particles distributed throughout the filter depth rather than concentrating at the surface.
Occurrence and Pathways of Microplastics in Bioretention Filters
AI summary Read the abstract
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.
Field assessment of engineered bioretention as microplastics sink through site characterization and hydrologic modeling
AI summary Read the abstract
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.
Microplastics in Field-Installed Bioretention Systems: Vertical Distribution and Retention from Stormwater
AI summary Read the abstract
Scientists tested rain gardens (special planted areas that filter stormwater runoff) to see if they can trap tiny plastic particles that wash off city streets and parking lots. They found these systems do catch microplastics before they reach rivers and drinking water sources, with most plastic pieces getting trapped deep in the soil layers. This research suggests that installing more rain gardens in cities could help reduce the amount of microplastics that end up in our water supply.
[Removal Mechanism of Microplastics in Bioretention Systems and the Influence of Their Enrichment on the Treatment of Pollutants in the System].
AI summary Read the abstract
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.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.