Measuring and Removing Dissolved Metals from Stormwater in Highly Urbanized Areas (2014) / Chapter Skim
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Pages 92-96
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92 8.1 Introduction The objective of this chapter is to provide a brief summary of the results achieved during this research project. Various topics have been investigated including: • Characterization of highway runoff • Environmental chemistry of dissolved metals in natural surface waters • Previous work on the removal of dissolved metals in runoff • A laboratory evaluation of the dissolved metals removal for selected materials • Development of conceptual BMP designs for the most promising materials • Identification of future research needs Each of these topics is discussed in more detail below.
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93 complexation with NOM, oxidation/reduction reactions, precipitation, and sorption. This literature review presented a brief description of each of these processes and identified their impact on speciation of commonly identified metal ions.
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94 to impacts on pH, headloss, and clogging, one particular material that has demonstrated potential for application to stormwater treatment is crab-shell waste. The combination of chitin and calcium carbonate has been proposed as an ideal media combination because the calcium carbonate promotes the formation of metal carbonate microprecipitates and chitin is a good adsorbent for these microprecipitates.
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95 since the pH of rainfall can vary substantially. Another important point of interest is that the pH of the system increased for a short period of time after the flow was interrupted for more than 24 hours.
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96 Locations in rural areas with vegetated shoulders may also have a curbed section and a longitudinal drainage system, but in many cases the paved shoulder abuts a vegetated buffer strip that discharges to a longitudinal vegetated swale. The advantage of this type of design is that runoff may be intercepted in a sheet flow condition and vegetated strips are effective for pretreatment to remove solids in runoff.
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