Measuring and Removing Dissolved Metals from Stormwater in Highly Urbanized Areas (2014) / Chapter Skim
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42.1 Stormwater Composition Highway runoff is comprised of a number of soluble and insoluble constituents that vary with respect to their behavior in the environment. Metals such as cadmium (Cd)
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5 Constituent Mean (µg/L) Median (µg/L)
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62.2 Particles in Highway Runoff Stormwater runoff transports significant loads of dissolved, colloidal, and suspended particles in a complex mixture that includes metals and inorganic and organic compounds. While the temporal variability and complexity of rainfall-runoff chemistry is recognized, the focus herein is the transport, distribution, and partitioning of metals as mediated by the wide gradation of particles from highway systems.
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7 pavement, (3) to particles in runoff at the edge of the right-ofway (ROW)
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8in runoff or other aqueous systems, there is a temporal partitioning between metals in solution and the entire gradation of particles. This partitioning includes specific mass transfer mechanisms such as adsorption and ion exchange.
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9 chemistry parameters is a necessary first step for conceptual and detailed treatment design. The dominance of the dissolved mass for all metals, including relatively insoluble Pb for short urban surface residence times (initial pavement residence time < 15 minutes)
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10 form more stable complexes with inorganic and organic carbon in runoff. 2.4 Summary Metals concentrations in highway runoff are elevated compared to most natural receiving waters and have been shown to have toxic effects on some aquatic species.
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