Stormwater Symposium

Oral

395089 - Use and Monitoring of Alternative Media in Stormwater Biofiltration Systems

Tuesday, June 5
10:30 AM - 12:00 PM
Location: Mirage Room
Co-Authors: Meijun Cai, Duluth, Minnesota – Natural Resource Research Institute; Kurt Johnson, Duluth, Minnesota – Natural Resource Research Institute; Marsha Patelke, Duluth, Minnesota – Natural Resource Research Institute; David Saftner, Duluth, Minnesota – University of Minnesota Duluth; Rebecca Teasley, Duluth, Minnesota – University of Minnesota Duluth

As a part of a multi-phase project, this research focuses on the implementation and evaluation of alternative media for use in biofiltration systems. Following national regulation, the Minnesota Department of Transportation (MnDOT) requires the first inch of stormwater runoff to be retained. MnDOT currently specifies the use of clean sand and organic compost in filtration systems adjacent to roadways. These standards ensure that media can sustain vegetation while also adequately infiltrating stormwater and filtering pollutants. The first phase of research investigated the merit of using locally available re-claimed media in biofiltraiton designs as cost effective and readily available resources. Each media was tested to determine its ability to sustain vegetation, infiltrate water at adequate rates, and treat pollutants. New mix designs were then created and used in small scale field plots to evaluate infiltration and water treatment effectiveness. The next phase of research will utilize the developed laboratory testing procedure to assess the existing biofiltration systems in Minnesota. Soil samples will be taken from these sites and subjected to the designed testing regimen. In situ hydraulic conductivity testing will be performed along with long term infiltration and water quality monitoring. Utilizing these results, a mix design will be selected for use in a new biofiltration system. The new system will be implemented as a large scale project and undergo the same laboratory testing, field testing, and long term monitoring as the other sites. Results from this research will be applied in the design of future biofiltration systems.

Chanelle Cruz

Graduate Student
University of Minnesota Duluth

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