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61,005 resultsShowing papers similar to Innovative bioretention filters effectively remove microplastics from polluted stormwater
ClearInnovative bioretention filters effectively remove microplastics from polluted stormwater
Researchers evaluated a pilot rain garden facility with 13 bioretention filters incorporating sorbent materials including waste-to-energy bottom ash, biochar, and Sphagnum peat mixed with sandy loam, testing their ability to remove microplastics from highway stormwater over 48 months using pyrolysis-GC/MS analysis. They found that the innovative filters effectively reduced microplastic concentrations across all 13 target polymers, with polyisoprene and styrene-butadiene rubber among the highest-concentration contaminants in the stormwater inflow.
Removal of microplastics, organic pollutants and metals from stormwater in bioretention filters with added sorbent material during simulated extreme rainfall events under winter conditions with dormant plants
Bioretention filters with sorption materials (bottom ash, biochar, Sphagnum peat) were tested under simulated extreme winter rainfall, maintaining high removal efficiency (>85%) for microplastics, metals, and organic pollutants from stormwater even under plant dormancy conditions.
Analysis of Bioretention Capability in Removing Microplastic Particles from Stormwater
This study tested the ability of bioretention systems (vegetated stormwater gardens) to remove microplastic particles from stormwater, finding effective removal across multiple particle sizes and types. Bioretention infrastructure shows promise as a practical tool for preventing microplastics from stormwater runoff from reaching rivers and coastal waters.
Bark and biochar in horizontal flow filters effectively remove microplastics from stormwater
Researchers tested horizontal flow filters made with bark and biochar for their ability to remove microplastics from stormwater, achieving effective retention of multiple plastic types including polyamide, polyethylene, polypropylene, and polystyrene. The organic filter materials trapped the majority of particles, with performance varying by plastic type and filter composition. The study demonstrates that affordable, nature-based filter systems can be a practical solution for reducing microplastic pollution in urban stormwater runoff.
Advancing microplastics remediation in bioretention systems using biochar/kaolin: Optimizing organics removal, plant health, and microbial community dynamics
Researchers tested biochar, kaolin, and a combined kaolin-biochar composite in stormwater filtration columns and found the composite removed up to 97% of microplastics while also improving removal of organic pollutants and supporting beneficial soil bacteria. Adding plants to the system further boosted microplastic capture, pointing toward affordable, nature-friendly water treatment upgrades.
Occurrence and Pathways of Microplastics in Bioretention Filters
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
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.
Microplastics Characterization in Stormwater: Pavement Source Evaluation and Treatment Efficiency of a Bioretention Cell
Researchers characterised microplastics in stormwater from pavement sources and evaluated the treatment efficiency of a bioretention cell, finding that pavement surfaces contribute substantially to microplastic loading and that bioretention can reduce particle concentrations.
[Removal Mechanism of Microplastics in Bioretention Systems and the Influence of Their Enrichment on the Treatment of Pollutants in the System].
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.
Removal of microplastics and metals in biochar beds for stormwater treatment: Effects of prolonged drying and salinity on pollutant mobility
Researchers tested biochar — a charcoal-like material made from organic waste — as a filter for removing microplastics and heavy metals from stormwater runoff, finding it retained up to 99% of microplastics but that prolonged dry periods and high salinity increased the release of metals, highlighting real-world limitations of this promising treatment approach.
Evaluation of Biochar as an Amendment for the Removal of Metals, Nutrients, and Microplastics in Bioretention Systems
This study evaluated biochar as an amendment to bioretention soil media for removing metals, nutrients, and microplastics from stormwater runoff. Results showed that biochar improved contaminant removal across all three pollutant classes compared to unamended soil media, supporting its use in green stormwater infrastructure.
Bark and biochar in horizontal flow filters effectively remove microplastics from stormwater
Researchers investigated the removal of stormwater microplastics using horizontal flow filters filled with bark and biochar, finding that both materials retained over 97% of polyamide, polyethylene, polypropylene, and polystyrene particles across size ranges of 25-900 µm when analyzed by µFTIR imaging.
Bark and biochar in horizontal flow filters effectively remove microplastics from stormwater
Researchers investigated the removal of stormwater microplastics using horizontal flow filters filled with bark and biochar, finding that both materials retained over 97% of polyamide, polyethylene, polypropylene, and polystyrene particles across size ranges of 25-900 µm when analyzed by µFTIR imaging.
Microplastics in Field-Installed Bioretention Systems: Vertical Distribution and Retention from Stormwater
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.
Improving stormwater quality for microplastic (25 – 106 µm) using a bioretention cell
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.
Field assessment of engineered bioretention as microplastics sink through site characterization and hydrologic modeling
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 concentration of 20–100 μm sized microplastic in highway runoff and its removal in a gross pollutant trap – Bioretention and sand filter stormwater treatment train
A stormwater gross pollutant trap followed by bioretention and sand filter treatment was found to remove 20 to 100 micrometer microplastics from highway runoff in addition to larger particles, with removal efficiency dependent on particle size and treatment train configuration.
The Occurrence and Removal of Microplastics from Stormwater Using Green Infrastructure
This review examines microplastic occurrence in urban stormwater and the potential of green infrastructure — particularly bioretention systems and constructed wetlands — to capture and remove plastic particles before they reach surface water bodies.
Urban stormwater microplastics – Characteristics and removal using a developed filtration system
This Finnish study tested a concrete filtration system with sand and biochar media to remove microplastics from urban stormwater runoff. Both media showed effective removal, with results suggesting that on-site stormwater filtration could be a practical strategy for reducing microplastic inputs to receiving water bodies.
Small-Size Microplastics in Urban Stormwater Runoff are Efficiently Trapped in a Bioretention Cell
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.
The ability of selected filter materials in removing nutrients, metals, and microplastics from stormwater in biofilter structures
A laboratory experiment tested several filter materials in a biofilter structure for their ability to remove nutrients, metals, total suspended solids, and microplastics from roadside stormwater. The study demonstrated that ecologically based biofilter designs can capture multiple contaminant types from urban runoff.
Abundance, distribution, and composition of microplastics in the filter media of nine aged stormwater bioretention systems
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.
Plastic pollution risks in bioretention systems: a case study
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.
Microplastics and nanoplastics in stormwater management engineered porous media systems: a systematic review of their sources, transport, retention, and removal characteristics
This systematic review summarizes how engineered stormwater systems like rain gardens and biofilters capture and retain microplastics and nanoplastics. The findings show these systems can effectively reduce plastic particles in stormwater runoff, which matters because untreated stormwater is a major pathway for microplastics to enter the rivers and lakes that supply our drinking water.