RFI - Attachment F - Engineering Report

al. (2015) in Beijing, China, it was found that activated alumina filter media could
remove 70-80% of the Total Phosphorus.
Activated alumina media within StormFilter® has necessary physical and chemical
filtration characteristics to promote adsorption of pollutants such as dissolved
phosphorus (Ma, 2011). The RCFS system (used at the Mitchell Community College
test site located in the town of Mooresville, North Carolina, USA) contained a total of
eight, 460mm high, media-filled filter cartridges operating at a flow rate of 0.5L/s per
cartridge. Each of the filter cartridges was filled with an activated alumina media
(Figure 1). The media used for this study was a granular perlite coated with activated
alumina. This was done to aid in the attenuation and/ or capture of nutrient pollutants
by cation exchange and adsorption. With the exception of the surface coating,
coated and uncoated perlite media were determined to be identical with respect to
physical characteristics and therefore the media should be considered equivalent
with respect to expected solids removal performance (Wicks et al., 2014).




Figure 1. Features of a radial cartridge filtration system (RCFS) (Wickks et al., 2014)


3. Review of Field Testing on StormFilter®

A field testing was carried out by Contech Engineered Solutions (Contech, 2012) to
demonstrate the effectiveness of the Stormwater Management StormFilter®
Stormwater Treatment System (system) in treating stormwater runoff with respect to
the removal of solid and nutrient pollutants. This twenty month’s field study during
2011-12 was conducted at the Mitchell Community College testing site located in the
Town of Mooresville, NC, USA. The test site is shown in Figures 2 and 3.



                                           3