Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff (2019) / Chapter Skim
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45 Chapter 4 Bench Scale Testing of Open Graded Friction Course A limited laboratory testing program was completed to evaluate the effectiveness of ferric oxide media in removing dissolved metals in open-graded friction course (OGFC) pavement under laboratory-controlled conditions.
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46 4.1.2 OGFC Specimen Preparation For bench scale testing, two OGFC mix designs were completed by American Engineering Testing (AET) following Superpave and other relevant standards as shown in Appendix A
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47 2. Control: A control test was conducted for one aggregate and contact time combination.
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48 FE-based particle transport simulations were completed using GeoStudio Suite, which is a software package developed by GEO-SLOPE International. A subprogram of the suite can be used to model seepage flow through porous media and particle transport.
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49 Table 4-2 Contact Time Estimation Based on FE Simulations. Particle k= 250 in hr-1 k=100 in hr-1 I = 0.46 in hr-1 I = 0.11 in hr-1 I = 0.46 in hr-1 I = 0.11 in hr-1 Contact Time (Travel Time)
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50 Figure 4-7 Cumulative distribution for pH from SELDM. Figure 4-8 Cumulative distribution for hardness from SELDM.
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51 Figure 4-9 Cumulative Distribution for Metals from SELDM. The national cumulative distributions shown above were used to estimate median storm event concentrations for pH, hardness, chromium, copper, lead, and zinc.
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52 Figure 4-10 Ferric oxide media. The concentration of ferric oxide media used in the experiments was estimated from the maximum adsorptive capacity of granulated ferric oxide and zinc reported in NCHRP 767 study (Barrett et al., 2014)
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53 5. Add ferric oxide media to OGFC sample using concentration indicated in Section 4.1.5 by completing several circulation cycles of a water-ferric oxide mix.
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54 dissolved metals removal was not affected by aggregate material (e.g., quartzite or granite) for all of the metals tested except for nickel.
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55 Figure 4-12 Uncorrected percent removal of dissolved metals for granite OGFC for tests conducted with 0.7, 2.0, and 4.7 hours contact time. Figure 4-13 Corrected percent removal of dissolved metals for quartzite OGFC for tests conducted with 0.7, 2, and 4.7 hours contact time.
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56 Figure 4-14 Corrected percent removal of dissolved metals for granite OGFC for tests conducted with 0.7, 2.0, and 4.7 hours contact time. When interpreting these results it is important to note that testing was limited and thus no statistical analysis was completed.
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