SOLID AND NUTRIENT POLLUTANT REMOVAL BY AN ENGINEERED STORMWATER FILTRATION MEDIA

摘要

This paper provides a summary of the results associated with a 20-month field study conducted at the Mitchell Community College test site located in the town of Mooresville, North Carolina, USA. The study was conducted to demonstrate the effectiveness of a radial cartridge filtration system (RCFS) using an activated alumina media, treating stormwater runoff with respect to the removal of solid and nutrient pollutants. Testing of the RCFS was conducted for a suite of pollutants, including Total Suspended Solids (TSS), Total Phosphorus (TP) and Total Nitrogen (TN) in accordance with an approved Project Plan. Results from the study indicated that the RCFS, operating at 0.5L/s per cartridge, successfully treated stormwater runoff with significant reductions for solid and nutrient pollutants that were observed between influent and effluent sampling locations using the Efficiency Ratio (ER) calculation (TSS 90%, TP 86%, and TN 56%) and Summation of Load (SOL) efficiency calculation methods (TSS 91%, TP 87%, and TN 50%). These results demonstrate that the radial cartridge filter system was able to successfully meet the current load-based objectives from the NSW DECC (2007) and QLD Single State Planning Policy (2014) for all relevant pollutants, including TSS, TP and TN.