You are here:
ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER MANAGEMENT STORMFILTER® TREATMENT SYSTEM USING PERLITE MEDIA
Citation:
NSF INTERNATIONAL. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT: STORMWATER MANAGEMENT STORMFILTER® TREATMENT SYSTEM USING PERLITE MEDIA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-05/137, 2005.
Impact/Purpose:
provide information
Description:
Verification testing of the Stormwater Management, Inc. StormFilter® Using Perlite Filter Media was conducted on a 0.7 acre drainage basin near downtown Griffin, Georgia. The system consists of an inlet bay, flow spreader, cartridge bay, overflow baffle, and outlet bay, housed in a 18 foot by 8 foot pre-cast concrete vault. The StormFilter® is designed to treat flows up to 495 gpm, while flows greater than 495 gpm would be bypassed by an upstream diversion device. The verification challenge included collecting influent and treated effluent samples during 15 qualified storm events. A qualified storm event was defined as a minimum of 0.2 inches of rainfall, where representative sample aliquots are collected throughout the duration of the event and composited into a flow-weighted composite sample. The influent and effluent sampling areas were equipped with automated samplers and flow monitoring devices to collect and monitor the flows entering and exiting the system. The verification testing concluded that the system was capable of removing approximately 50 percent of sediment as determined by both the total suspended solids (TSS) and suspended sediment concentration (SSC) analytical procedures. Particle size analysis conducted on stormwater samples showed the runoff entering the StormFilter® contained a large proportion of sediment smaller than 62.5 µm. The StormFilter® also removed total cadmium, copper, lead and total and dissolved zinc from stormwater. The system was cleaned and equipped with new filter cartridges before the start of verification testing, and after the completion of the 11-month verification period. Maintenance consisted of replacing the filter cartridges and vacuuming sediments from the sediment chamber. At the end of the verification period, approximately 4.75 in. of accumulated sediment was observed in the inlet bay. In the filter bay, the depth of accumulated sediment ranged from 0 to 3.5 in.