Water, Wastewater & Stormwater

Oral

394034 - Refining Compost Recommendations for Stormwater Control Measures

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

Incorporation of compost into Stormwater Control Measures (SCMs), such as bioretention and submerged gravel wetlands (SGW), provides nutrients for vegetation, increases water holding capacity, and is capable of retaining pollutants. However, compost can leach nitrogen (N) and phosphorus (P) in SCM applications, in some cases, at levels exceeding total maximum daily load (TMDL) concerns. The objective of this research was to investigate ways to maximize the use of compost in SCMs, and to refine existing compost recommendations, including the types, amount, and layering/mixing of compost, for use in SCMs. The performance of green-waste compost was evaluated in two (15% and 30% compost by volume) large column bioretention mesocosm experiments over a duration of approximately 10 months. Both columns have standard Bioretention Soil Mixture (BSM) amended with aluminum-based water treatment residual (Al-WTR), with compost layered at the top. Columns were loaded with a synthetic stormwater runoff containing heavy metals, N and P compounds, with a fixed background salt level. N and P were evaluated in the sub-drain effluent, confirming that the Al-WTR amendment can improve P adsorption, and layering compost on the top of BSM can reduce the P and N concentrations in treated effluent, preventing P and N leaching. The ability of internal water storage to enhance nitrate removal via denitrification was also assessed, indicating that when hydraulic retention time is relatively short (approximate 80 mins), denitrification occurs primarily between storm events. Additionally, plant studies, with focus on vegetation survival and growth, suggest better vegetation growth associated with compost-amended BSM.

Lei Lei

Student
University of Maryland, College Park

Presentation(s):

Send Email for Lei Lei


Assets

394034 - Refining Compost Recommendations for Stormwater Control Measures



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for Refining Compost Recommendations for Stormwater Control Measures