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Occurrence and Characteristics of Microplastics Pollution in Different Types of Urban Runoff
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Researchers quantified and characterized microplastics in urban surface runoff from different land use types. They found microplastics in all runoff samples, with concentrations and dominant particle types varying by land use, suggesting that road surfaces and commercial areas are significant sources. The study contributes data for urban stormwater management strategies aimed at reducing microplastic loading in receiving waterways.
Recently, plastic debris and microplastics pollution have been found widely in marine and freshwater systems. As one of the major sources, microplastics distribution and pollution in urban surface runoff is still unknown. This study aimed at quantifying and analyzing the occurrence and characteristics of microplastics in different urban runoff by simulating rainwater runoff to scour three types urban surfaces. The results showed that microplastics pollution occur in residential areas, parking lots and urban cement pavements with the average concentrations of microplastics, 145 particle/m 3 , 3 particle/m 3 and 1 particle/m 3 , respectively. The cumulative intensities of parking lots and urban cement pavements are much lower than residential roads, which might be highly due to frequently used plastics around these areas. Meanwhile, according to the calculation in this study, microplastics pollution in urban surface runoff may play a significant role in the contribution to that pollution in subsequent rivers and coastal oceans.
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Researchers collected stormwater runoff from three different urban land use types and found microplastics present across all sites, with significant variation in polymer types depending on the area. By using multiple detection techniques, they were able to identify particles as small as 1 micrometer, revealing that the smallest size fractions dominated the total count. The study emphasizes that urban runoff is a major pathway for microplastic pollution reaching waterways.
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Researchers characterized microplastics in stormwater runoff samples collected at urban outfall locations. The study identified 17 different polymer types across various storm events, with concentrations around 0.99 particles per liter for the 500-1000 micrometer size range, and found that rainfall intensity and land use were key factors controlling microplastic loading rates.
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Researchers investigated microplastic emission characteristics in urban stormwater runoff from industrial and residential catchments. Microplastics were detected in concentrations of 54 to 639 particles per liter, with polypropylene and polyethylene being the dominant polymers and fragments the most common shape, and concentrations were higher after longer dry periods.
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Researchers found that stormwater runoff from both industrial and residential urban catchments contained substantial microplastics (54–639 particles per liter), with polypropylene and polyethylene dominating, and that microplastic concentrations peaked early in rain events following longer dry periods.
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