Increases in urbanization has led to excess stormwater production and mobilization of numerous pollutants from urban watersheds. Discharge of these pollutants leads to contamination of receiving water bodies. Chemical characterization of urban stormwater is necessary to gain deeper insights into the ecological impacts of urban runoff and to factors that influence possible treatment technologies. This project collected stormwater event mean concentration and particle size fraction data from field studies from peer-reviewed literature and national/international stormwater quality databases. A comprehensive characterization of urban runoff pollutants, including dissolved and particulate-bound, and their partitioning and speciation behavior. Solids, nutrients, metals, various organic pollutants, and pathogens (indicators) were evaluated. Due to limited data, metals evaluation is limited to Zn, Cu, Pb, Fe and Cr. A significant fraction of phosphorous, metals and organics are particle-bound. Metal speciation results demonstrated divalent ions (Zn, Cu and Pb) present predominantly as dissolved organic matter complexes, and trivalent ions (Fe and Cr) forming hydroxide complexes. Land use and EPA rain zones influenced the concentrations of many water quality constituents, while seasonal variation did not show high statistical significance. Further, as an outcome of our data analysis, a recommendation for synthetic stormwater is offered that can adequately represent field conditions in a lab setting to enable accurate and realistic results for use in lab-scale treatment research, to better scale up from lab to field. The urban stormwater recipe will account for particulate-bound pollutants, incorporating different size fractions to accurately mimic urban stormwater.<br/>

Urban stormwater chemistry: Quality characterization and recommendation for synthetic stormwater

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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