| − | * A Maplewood,Minnesota field study developed an iron-enhanced (5% iron filings) ditch check sand filter for installation in [[Swales|swales]] to provide treatment of dissolved heavy metals and dissolved phosphorous in stormwater runoff from highways (Ahmed at el., 2014) <ref>Ahmed, F., Natarajan, P., Gulliver, J., Weiss, P., Nieber, J. 2014. Assessing and Improving Pollution Prevention by Swales. https://www.lrrb.org/pdf/201430.pdf</ref>. | + | * A Maplewood, Minnesota field study used an iron-enhanced (5% iron filings) ditch check sand filter for installation in [[Swales|swales]] to provide treatment of dissolved heavy metals and dissolved phosphorous in stormwater runoff from highways (Ahmed at el., 2014) <ref>Ahmed, F., Natarajan, P., Gulliver, J., Weiss, P., Nieber, J. 2014. Assessing and Improving Pollution Prevention by Swales. https://www.lrrb.org/pdf/201430.pdf</ref>. |
| | [[File:Screenshot 2025-08-13 113919.png|500px|thumb|[[Bioretention]] schematic, with circles highlighting ZVI addition and phosphorus removal <ref name = Lechner>Lechner L. Phosphorus Removal From Stormwater Using Zero-Valent Iron. 2016. Applied Science Masters Thesis.</ref>.]] | | [[File:Screenshot 2025-08-13 113919.png|500px|thumb|[[Bioretention]] schematic, with circles highlighting ZVI addition and phosphorus removal <ref name = Lechner>Lechner L. Phosphorus Removal From Stormwater Using Zero-Valent Iron. 2016. Applied Science Masters Thesis.</ref>.]] |