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Bark and biochar in horizontal flow filters effectively remove microplastics from stormwater
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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.
Organic materials such as bark and biochar can be effective filter materials to treat stormwater. However, the efficiency of such filters in retaining microplastics (MPs) – an emerging stormwater pollutant – has not been sufficiently studied. This study investigated the removal and transport of a mixture of MPs commonly associated with stormwater. Different MP types (polyamide, polyethylene, polypropylene, and polystyrene) were mixed into the initial 2 cm material of horizontal bark and biochar filters of 25, 50, and 100 cm lengths. The MP types consisted of spherical and fragmented shapes in size ranges of 25–900 µm. The filters were subjected to a water flow of 5 mL/min for one week, and the total effluents were analyzed for MPs by µFTIR imaging. To gain a deeper insight, one 100 cm bark filter replica was split into 10 cm segments, and MPs in each segment were extracted and counted. The results showed that MPs were retained effectively, ¿97 Also see: https://micro2024.sciencesconf.org/548213/document
More Papers Like This
Bark and biochar in horizontal flow filters effectively remove microplastics from stormwater
AI summary Read the abstract
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
AI summary Read the abstract
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.
Urban stormwater microplastics – Characteristics and removal using a developed filtration system
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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.
Innovative bioretention filters effectively remove microplastics from polluted stormwater
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Researchers constructed a pilot rain garden facility with 13 bioretention filters incorporating innovative sorbent materials — waste-to-energy bottom ash, biochar, and Sphagnum peat — mixed with sandy loam and planted with salt-tolerant vegetation, then irrigated with stormwater from a highway over 48 months to evaluate microplastic removal efficiency by pyrolysis-GC/MS. They found the bioretention filters effectively removed diverse microplastic polymers from urban stormwater, with all 13 target polymers detected in inflow and variable removal efficiencies across sorbent treatments.
Innovative bioretention filters effectively remove microplastics from polluted stormwater
AI summary Read the abstract
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.
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