**Abstract Text**
Stormwater pollution is a common source of waterbody contamination worldwide. Neonicotinoid pesticides, heavy metals, and nutrient concentrations in runoff water are of particular and growing concern. Traditionally, bioretention is used to manage the movement of these and other contaminants through the environment. However, recent research has identified potential areas for improvement with this best management practice such as removal of some metals, phosphorus, and organic contaminants with low sorptive coefficients. This proof of concept study focuses on three industrial waste products as an amendment to bioretention underdrain designs to improve water quality effluent flowing to receiving waterbodies. Industrial waste products are attractive due to their low cost, abundance, and properties such as (but not limited to) calcium/iron/aluminum content, high surface area, and cation exchange capacity. Experiments were run with fly ash, steel slag, and biochar in two different flow through column experiments. Influent and effluent samples were taken at intervals to measure the removal capacity of each medium throughout time. Initial results show promising outcomes for all three media to treat bioretention effluent. Smaller media sizes are preferable to larger media sizes to help increase media reactive area. Steel slag performed best at removing phosphorus with reductions between 50-90%. Neonicotinoids removal rates were largely between 25-75%, with biochar and steel slag being most efficient. Metals removal was highly variable with mixed results between different media likely due to complex sorption/desorption/exchange reactions. At this time, data analysis and modeling is still ongoing.



Industrial Waste Byproducts as a Treatment For Bioretention Effluent: A Benchtop Proof of Concept (Room 301 D, Tuesday 8th, 1:30pm-3:00pm)

The International Low Impact Development Conference highlights interdisciplinary practice, research, and implementation of Low Impact Development (LID), Green Infrastructure (GI), Sustainable Urban Drainage Systems (SUDS) and Water Sensitive Urban Designs (WSUD). The focus will be on using our past and present understanding of LID to tune management programs, design practice, and operation and maintenance into the future.