Water, Wastewater & Stormwater

Oral

394311 - Development of a High-Flow Structural Treatment Media for Improving Stormwater Quality

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Greenway EF
Co-Authors: Allen Davis, College Park, MD – University of Maryland

Phosphorus (P) loadings from urban runoff is a persistent contributor to water body impairment. However, dissolved phosphorus (DP) is not well-retained by many stormwater control measures (SCMs), including permeable pavements. Furthermore, captured particulate P can solubilize and be exported. This project evaluates a base material developed to enhance P removal in permeable paving. The novel media consists of a combination of expanded shale, water treatment residual (WTR), and a soil binder. The media has high hydraulic conductivity, 9.0 x 10-2 ± 0.002 cm/s, and is structurally suitable as a permeable pavement base material. Under continuous loading with synthetic stormwater, it reduced effluent DP from 0.19 mg/L to below 0.05 mg/L P for rainfall equivalents well beyond the pavement design lifetime. In rainfall simulations, the media effectively also removed P, Zn, and Cu to acceptable levels. In a field pilot study, the permeable pavement/media has demonstrated improved P retention compared to an impervious control surface. Adsorption to aluminum (hydr)oxides in the WTR is thought to be the primary mechanism for DP retention. DP uptake is described by a 1st order steady-state plug flow model developed and calibrated using experimental data. The model indicates performance dependence on media depth and treatment flow rate.

Travis Ostrom, PE

Graduate Research Assistant
University of Maryland

Travis Ostrom is a professional engineer (P.E.) and Ph.D. candidate in civil and environmental engineering at the University of Maryland. His research is focused on treating urban runoff through enhanced stormwater control measures (SCMs). Travis previously worked as a municipal utility engineer and in water and sanitation in international development.

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