, Professor Emeritus, Civil, Environmental and Geo-Engineering
Meijun Cai, Research Technical Manager, UMD-Nat Resources Rsrch Inst
Tire derived aggregates (TDA), a waste product from automobile tires, are utilized in many engineering applications. There are questions about TDAs suitability for use as a stormwater infiltration/filtration media. A recent investigation by the PI's team (Professor John S Gulliver (PI) and Raymond Hojalski (Co-PI), "Tire Derived Aggregate for Stormwater Treatment," Seed research funded by MnDRIVE) on the applicability of two inch TDA for stormwater treatment has shown good phosphate retention, but with substantial leaching of zinc and some copper. The overall objective of this research is to develop a system of media that will utilize the phosphate retaining characteristic of TDA while reducing zinc and copper release. There are many materials that can capture metals, such as compost, peat, biochar and various amines and clay particles, and the goal of this study will be to develop the optimum combination that will reduce metal leaching while allowing for phosphate retention. The mixtures will be tested the potentials to remove per- and polyfluoroalkyl substances (PFAS) from water. Biofilms will also adsorb zinc and copper, so a study of biofilm growth and adsorption of these two metals will be a secondary objective. In addition, longevity studies will be run with multiple stormwater flushes into TDA to simulate those occurring over many years. Education and outreach to practitioners from cities, counties, MnDOT, and corresponding consulting firms on the proper utilization of TDA will be the final objective of the study.
- Project number: 2023001
- Start date: 06/2022
- Project status: Active
- Research area: Environment and Energy
Environment, Storm water