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Suggested Citation:"Chapter 8 Potential Future Research." National Academies of Sciences, Engineering, and Medicine. 2019. Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff. Washington, DC: The National Academies Press. doi: 10.17226/25669.
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72 Chapter 8 Potential Future Research Ferric oxide is a promising treatment media for highway runoff treatment and the results of this study suggest that additional investigation is warranted. Potential future studies include the following:  Evaluation of different ferric oxide media in a full scale treatment system, including: o Iron mining tailings which have residual ferric oxide or elemental ion o Ferrihydrite o Granular ferric oxide o Several different zero valent iron materials that will be parent material for ferric oxide.  Evaluation of the kinetics of ferric oxide and metal binding.  Laboratory and field testing of ferric oxide media in a matrix other than sand to increase the hydraulic conductivity, reduce contact time, and ultimately reduce the treatment cell footprint.  Laboratory and field testing of different ferric oxide media with OGFC.  Examine the potential long-term longevity of ferric oxide with a number of different matrices (e.g., sand, coarse sand, crushed limestone, etc.).  Evaluate ferric oxide media longevity and media amendment/replacement requirements throughout the life of constructed BMPs. Compare how observed operation and maintenance costs compare to those estimated.

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Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff Get This Book
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There are several best management practices that are good at removing particulate-bound pollutants by settling, filtering, and, in the case of wetlands, settling, uptake, and incorporation of pollutants into biological matter (e.g., natural organic matter). However, a longstanding goal of stormwater treatment is the removal of the stormwater pollutant fraction that cannot be readily settled or filtered.

While there are several media that may be employed to remove dissolved metals from stormwater, the media chosen for the TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 265: Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff is ferric oxide. Field scale testing of ferric oxide was recommended as an outcome of NCHRP Report 767: Measuring and Removing Dissolved Metals fromStorm Water in Highly Urbanized Areas (2014), a laboratory study that considered several metals and media with testing focused on the capacity of ferric oxide to remove copper and zinc from synthetic and natural highway stormwater runoff.

Highlights of the project are summarized in a PowerPoint presentation.

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