Field Test of BMPs Using Granulated Ferric Oxide Media to Remove Dissolved Metals in Roadway Stormwater Runoff (2019) / Chapter Skim
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57 Chapter 5 Ferric Oxide Filter Sizing Methodology Sizing a ferric oxide-sand filter to meet load reduction goals is different than sizing for ponds or other filtration devices. Although future study is warranted to confirm the outcome of this study, it appears that ferric oxide-sand filters will likely be able to achieve a consistent treated concentration for a range influent pollutant concentrations and infiltration rates (which are a function of hydrology and the treatment system design)
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58 sand filter system: (1) bed area, and (2)
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59 An estimate of the ultimate biological oxygen demand (UBOD as mg O2 L-1) and the storm water oxygen consumption (mg O2 L-1 d-1)
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60 2.3. Filtration rate The filter bed infiltration rate is calculated using Darcy's Law and the depth of water ponded above the filter bed.
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61 If VT is less than the pore space volume of the filter bed which is given by: đ đ â đˇ â đ´ Eq. 8 Then the depth in the filter bed is đˇ â Eq.
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62 A compilation of the different simulations are shown in Table 5-1 and an example of the outcome of one of the simulation iterations (ferric oxide-sand filter bed area of 0.25 acres, overflow outlet depth of 1 foot, and ultimate biological oxygen demand of 25 mg L-1) is shown in Figure 5-1.
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63 Figure 5-1 Ferric oxide-sand filter sizing example showing (a) water level within and above the ferric oxide sand filter bed, (b)
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64 Table 5-1 Outcome of the ferric oxide-sand treatment cell sizing exercise. Cell and Watershed Parameters Hydrology Potential Dissolved Load Reduction (g yearâ1)
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