Stormwater Detention Reservoirs: An Opportunity for Monitoring and a Potential Site to Prevent the Spread of Urban Microplastics

Moruzzi, Rodrigo Braga; Speranza, Lais Galileu; Conceição, Fabiano Tomazini da; Martins, Suely Teodoro de Souza; Busquets, Rosa; Campos, Luiza C.

doi:10.3390/w12071994

Cited by 26 publications

(22 citation statements)

References 44 publications

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“…Most black particles examined generated Raman spectra identified as carbon black (Supplementary Figure S7), which makes up 20%-35% of tires by weight (Hüffer et al, 2019). The spectra were also consistent with those used to identify tire wear particles in stormwater ponds (Braga Moruzzi et al, 2020). Black fragments made up 34% of the particles from which no spectrum was obtained (i.e., the "No Spectrum" category) in this study, which may be a result of melting of the rubber particles by the Raman laser, and this may indicate a greater contribution of tire wear particles than could be ascertained from the Raman results alone.…”

Section: Figuresupporting

confidence: 63%

Estimated discharge of microplastics via urban stormwater during individual rain events

Ross

Loutan²,

Groeneveld³

et al. 2023

Front. Environ. Sci.

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Urban stormwater runoff is an important pathway for the introduction of microplastics and other anthropogenic pollutants into aquatic environments. Highly variable concentrations of microplastics have been reported globally in runoff, but knowledge of key factors within urban environments contributing to this variability remains limited. Furthermore, few studies to date have quantitatively assessed the release of microplastics to receiving waters via runoff. The objectives of this study were to assess the influence of different catchment characteristics on the type and amount of microplastics in runoff and to provide an estimate of the quantity of microplastics discharged during rain events. Stormwater samples were collected during both dry periods (baseflow) and rain events from 15 locations throughout the city of Calgary, Canada’s fourth largest city. These catchments ranged in size and contained different types of predominant land use. Microplastics were found in all samples, with total concentrations ranging from 0.7 to 200.4 pcs/L (mean = 31.9 pcs/L). Fibers were the most prevalent morphology identified (47.7 ± 33.0%), and the greatest percentage of microplastics were found in the 125–250 µm size range (26.6 ± 22.9%) followed by the 37–125 µm size range (24.0 ± 22.3%). Particles were predominantly black (33.5 ± 33.8%), transparent (22.6 ± 31.3%), or blue (16.0 ± 21.6%). Total concentrations, dominant morphologies, and size distributions of microplastics differed between rain events and baseflow, with smaller particles and higher concentrations being found during rain events. Concentrations did not differ significantly amongst catchments with different land use types, but concentrations were positively correlated with maximum runoff flow rate, catchment size, and the percentage of impervious surface area within a catchment. Combining microplastic concentrations with hydrograph data collected during rain events, we estimated that individual outfalls discharged between 1.9 million to 9.6 billion microplastics to receiving waters per rain event. These results provide further evidence that urban stormwater runoff is a significant pathway for the introduction of microplastics into aquatic environments and suggests that mitigation strategies for microplastic pollution should focus on larger urbanized catchments.

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Section: Figuresupporting

confidence: 63%

Estimated discharge of microplastics via urban stormwater during individual rain events

Ross

Loutan²,

Groeneveld³

et al. 2023

Front. Environ. Sci.

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“…2B), especially since urban and stormwater runoff carry tire wear particles among other contaminants (Sutton et al 2019;Tian et al 2021). Stormwater retention ponds serve as microplastic retention sites on the landscape, and as conduits for microplastics to receiving waters (Liu et al 2019a;Moruzzi et al 2020). Stormwater ponds in industrial/commercial areas have higher microplastic concentrations than those receiving highway and residential runoff (Liu et al 2019a).…”

Section: Resultsmentioning

confidence: 99%

Runoff and discharge pathways of microplastics into freshwater ecosystems: A systematic review and meta-analysis

Wang

Bucci

Helm

et al. 2022

FACETS

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Although many studies have focused on the importance of littering and (or) illegal dumping as a source of plastic pollution to freshwater, other relevant pathways should be considered, including wastewater, stormwater runoff, industrial effluent/runoff, and agricultural runoff. Here, we conducted a meta-analysis focused on these four pathways. We quantified the number of studies, amount and characteristics of microplastics reported, and the methods used to sample and measure microplastics from each pathway. Overall, we found 121 studies relevant to our criteria, published from 2014 to 2020. Of these, 54 (45%) quantified and characterized microplastics in discharge pathways. Although most focused on wastewater treatment plant effluent (85%), microplastic concentrations were highest in stormwater runoff (0.009 to 3862 particles/L). Morphologies of particles varied among pathways and sampling methods. For example, stormwater runoff was the only pathway with rubbery particles. When assessing methods, our analysis suggested that water filtered through a finer (<200 um) mesh and of a smaller volume (e.g., 6 L) captured more particles, and with a slightly greater morphological diversity. Overall, our meta-analysis suggested that all four pathways bring microplastics into freshwater ecosystems, and further research is necessary to inform the best methods for monitoring and to better understand hydrologic patterns that can inform local mitigation.

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“…improved the water quality in water flowing over the structure, as highlighted in the studies of Sharior et al [14] and Braga et al [15].…”

Section: Literature Reviewmentioning

confidence: 91%

Accommodating stormwater storage structure in the veranda of shop building

Mah¹,

Bateni²,

Bustami³

et al. 2021

IJATEE

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Stormwater Detention Reservoirs: An Opportunity for Monitoring and a Potential Site to Prevent the Spread of Urban Microplastics

Cited by 26 publications

References 44 publications

Estimated discharge of microplastics via urban stormwater during individual rain events

Estimated discharge of microplastics via urban stormwater during individual rain events

Runoff and discharge pathways of microplastics into freshwater ecosystems: A systematic review and meta-analysis

Accommodating stormwater storage structure in the veranda of shop building

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