September 2004

Perlite Use in Stormwater Treatment is discussed in an EPA research paper, Evaluating Innovative Stormwater Treatment Technologies Under the Environmental Technology Verification (ETV) Program. "Assessing, controlling, and treating combined-sewer overflows (CSO0, sanitary sewer overflows (SSO), and urban stormwater runoff have become priorities for communities. Improved and cost effective treatment technologies are needed to reduce the adverse impacts that wet weather flows can have on surface water quality." The results of pilot programs are detailed, including a Stormwater Management, Inc. system that "consists of a StormGate, a StormFilter, and a StormScreen. "The StormFilter portion of the system is composed of filter cartridges housed in a steel vault . . . . This system uses perlite filter media in the filter cartridges. The filter systems are installed inline with the storm drain lines. The system works by percolating stormwater through the perlite filter media. This filter media is designed to trap particulates and adsorb materials such as suspended solids, petroleum hydrocarbons, and particulate bound removal such as particulate bound phosphorus, nitrogen, and metals." Read the complete article at http://www.epa.gov/ORD/NRMRL/Pubs/625R03003/16Hackett.pdf.

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